共查询到20条相似文献,搜索用时 15 毫秒
1.
Chaofan Yang Chong Qiao Yang Chen Xueqi Zhao Lulu Wu Yong Li Yu Jia Songyou Wang Xiaoli Cui 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(10)
High energy density is the major demand for next‐generation rechargeable batteries, while the intrinsic low alkali metal adsorption of traditional carbon–based electrode remains the main challenge. Here, the mechanochemical route is proposed to prepare nitrogen doped γ‐graphyne (NGY) and its high capacity is demonstrated in lithium (LIBs)/sodium (SIBs) ion batteries. The sample delivers large reversible Li (1037 mAh g?1) and Na (570.4 mAh g?1) storage capacities at 100 mA g?1 and presents excellent rate capabilities (526 mAh g?1 for LIBs and 180.2 mAh g?1 for SIBs) at 5 A g?1. The superior Li/Na storage mechanisms of NGY are revealed by its 2D morphology evolution, quantitative kinetics, and theoretical calculations. The effects on the diffusion barriers (Eb) and adsorption energies (Ead) of Li/Na atoms in NGY are also studied and imine‐N is demonstrated to be the ideal doping format to enhance the Li/Na storage performance. Besides, the Li/Na adsorption routes in NGY are optimized according to the experimental and the first‐principles calculation results. This work provides a facile way to fabricate high capacity electrodes in LIBs/SIBs, which is also instructive for the design of other heteroatomic doped electrodes. 相似文献
2.
Zhitao Wang Youqi Zhu Chen Qiao Shuo Yang Jian Jia Souleymen Rafai Xilan Ma Shide Wu Fengqiu Ji Chuanbao Cao 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(42)
Rechargeable magnesium batteries (rMBs) are promising as the most ideal further energy storage systems but lack competent cathode materials due to sluggish redox reaction kinetics. Herein, developed is an anionic Se‐substitution strategy to improve the rate capability and the cycling stability of 2D CuS1?xSex nanosheet cathodes through an efficient microwave‐induced heating method. The optimized CuS1?xSex (X = 0.2) nanosheet cathode can exhibit high reversible capacity of 268.5 mAh g?1 at 20 mA g?1 and good cycling stability (140.4 mAh g?1 at 300 mA g?1 upon 100 cycles). Moreover, the CuS1?xSex (X = 0.2) nanosheet cathode can deliver remarkable rate capability with a reversible capacity of 119.2 mAh g?1 at 500 mA g?1, much higher than the 21.7 mAh g?1 of pristine CuS nanosheets. The superior electrochemical performance can be ascribed to the enhanced reaction kinetics, enriched cation storage active sites, and shortened ion diffusion pathway of the CuS1?xSex nanosheet. Therefore, tuning anionic chemical composition demonstrates an effective strategy to develop novel cathode materials for rMBs. 相似文献
3.
Gi Dae Park Sung Jin Yang Jong‐Heun Lee Yun Chan Kang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(51)
Highly efficient anode materials with novel compositions for Li‐ion batteries are actively being researched. Multicomponent metal selenite is a promising candidate, capable of improving their electrochemical performance through the formation of metal oxide and selenide heterostructure nanocrystals during the first cycle. Here, the binary nickel–cobalt selenite derived from Ni–Co Prussian blue analogs (PBA) is chosen as the first target material: the Ni–Co PBA are selenized and partially oxidized in sequence, yielding (NiCo)SeO3 phase with a small amount of metal selenate. The conversion mechanism of (NiCo)SeO3 for Li‐ion storage is studied by cyclic voltammetry, in situ X‐ray diffraction, ex situ X‐ray photoelectron spectroscopy, in situ electrochemical impedance spectroscopy, and ex situ transmission electron microscopy. The reversible reaction mechanism of (NiCo)SeO3 with the Li ions is described by the reaction: NiO + CoO + xSeO2 + (1 ‐ x)Se + (4x + 6)Li+ + (4x + 6)e? ? Ni + Co + (2x + 2)Li2O + Li2Se. To enhance electrochemical properties, polydopamine‐derived carbon is uniformly coated on (NiCo)SeO3, resulting in excellent cycling and rate performances for Li‐ion storage. The discharge capacity of C‐coated (NiCo)SeO3 is 680 mAh g?1 for the 1500th cycle when cycled at a current density of 5 A g?1. 相似文献
4.
Yolk–Shell MnO@ZnMn2O4/N–C Nanorods Derived from α‐MnO2/ZIF‐8 as Anode Materials for Lithium Ion Batteries
下载免费PDF全文
![点击此处可从《Small (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Ming Zhong Donghui Yang Chenchao Xie Zhang Zhang Zhen Zhou Xian‐He Bu 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(40):5564-5571
Manganese oxides (MnOx) are promising anode materials for lithium ion batteries, but they generally exhibit mediocre performances due to intrinsic low ionic conductivity, high polarization, and poor stability. Herein, yolk–shell nanorods comprising of nitrogen‐doped carbon (N–C) coating on manganese monoxide (MnO) coupled with zinc manganate (ZnMn2O4) nanoparticles are manufactured via one‐step carbonization of α‐MnO2/ZIF‐8 precursors. When evaluated as anodes for lithium ion batteries, MnO@ZnMn2O4/N–C exhibits an reversible capacity of 803 mAh g?1 at 50 mA g?1 after 100 cycles, excellent cyclability with a capacity of 595 mAh g?1 at 1000 mAg?1 after 200 cycles, as well as better rate capability compared with those non‐N–C shelled manganese oxides (MnOx). The outstanding electrochemical performance is attributed to the unique yolk–shell nanorod structure, the coating effect of N–C and nanoscale size. 相似文献
5.
Baowei Lin Xiaohui Zhu Lingzhe Fang Xinyi Liu Shuang Li Teng Zhai Liang Xue Qiubo Guo Jing Xu Hui Xia 《Advanced materials (Deerfield Beach, Fla.)》2019,31(24)
Potassium‐ion batteries (PIBs) are one of the emerging energy‐storage technologies due to the low cost of potassium and theoretically high energy density. However, the development of PIBs is hindered by the poor K+ transport kinetics and the structural instability of the cathode materials during K+ intercalation/deintercalation. In this work, birnessite nanosheet arrays with high K content (K0.77MnO2?0.23H2O) are prepared by “hydrothermal potassiation” as a potential cathode for PIBs, demonstrating ultrahigh reversible specific capacity of about 134 mAh g?1 at a current density of 100 mA g?1, as well as great rate capability (77 mAh g?1 at 1000 mA g?1) and superior cycling stability (80.5% capacity retention after 1000 cycles at 1000 mA g?1). With the introduction of adequate K+ ions in the interlayer, the K‐birnessite exhibits highly stabilized layered structure with highly reversible structure variation upon K+ intercalation/deintercalation. The practical feasibility of the K‐birnessite cathode in PIBs is further demonstrated by constructing full cells with a hard–soft composite carbon anode. This study highlights effective K+‐intercalation for birnessite to achieve superior K‐storage performance for PIBs, making it a general strategy for developing high‐performance cathodes in rechargeable batteries beyond lithium‐ion batteries. 相似文献
6.
Jing Zhan Kuan Wu Xue Yu Mengjia Yang Xu Cao Bo Lei Dengyu Pan Hu Jiang Minghong Wu 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(21)
MoS2 nanosheets as a promising 2D nanomaterial have extensive applications in energy storage and conversion, but their electrochemical performance is still unsatisfactory as an anode for efficient Li+/Na+ storage. In this work, the design and synthesis of vertically grown MoS2 nanosheet arrays, decorated with graphite carbon and Fe2O3 nanoparticles, on flexible carbon fiber cloth (denoted as Fe2O3@C@MoS2/CFC) is reported. When evaluated as an anode for lithium‐ion batteries, the Fe2O3@C@MoS2/CFC electrode manifests an outstanding electrochemical performance with a high discharge capacity of 1541.2 mAh g?1 at 0.1 A g?1 and a good capacity retention of 80.1% at 1.0 A g?1 after 500 cycles. As for sodium‐ion batteries, it retains a high reversible capacity of 889.4 mAh g?1 at 0.5 A g?1 over 200 cycles. The superior electrochemical performance mainly results from the unique 3D ordered Fe2O3@C@MoS2 array‐type nanostructures and the synergistic effect between the C@MoS2 nanosheet arrays and Fe2O3 nanoparticles. The Fe2O3 nanoparticles act as spacers to steady the structure, and the graphite carbon could be incorporated into MoS2 nanosheets to improve the conductivity of the whole electrode and strengthen the integration of MoS2 nanosheets and CFC by the adhesive role, together ensuring high conductivity and mechanical stability. 相似文献
7.
Li Li Zhengjun Xie Gaoxue Jiang Yijing Wang Bingqiang Cao Changzhou Yuan 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(32)
Recently, binary ZnCo2O4 has drawn enormous attention for lithium‐ion batteries (LIBs) as attractive anode owing to its large theoretical capacity and good environmental benignity. However, the modest electrical conductivity and serious volumetric effect/particle agglomeration over cycling hinder its extensive applications. To address the concerns, herein, a rapid laser‐irradiation methodology is firstly devised toward efficient synthesis of oxygen‐vacancy abundant nano‐ZnCo2O4/porous reduced graphene oxide (rGO) hybrids as anodes for LIBs. The synergistic contributions from nano‐dimensional ZnCo2O4 with rich oxygen vacancies and flexible rGO guarantee abundant active sites, fast electron/ion transport, and robust structural stability, and inhibit the agglomeration of nanoscale ZnCo2O4, favoring for superb electrochemical lithium‐storage performance. More encouragingly, the optimal L‐ZCO@rGO‐30 anode exhibits a large reversible capacity of ≈1053 mAh g?1 at 0.05 A g?1, excellent cycling stability (≈746 mAh g?1 at 1.0 A g?1 after 250 cycles), and preeminent rate capability (≈686 mAh g?1 at 3.2 A g?1). Further kinetic analysis corroborates that the capacitive‐controlled process dominates the involved electrochemical reactions of hybrid anodes. More significantly, this rational design holds the promise of being extended for smart fabrication of other oxygen‐vacancy abundant metal oxide/porous rGO hybrids toward advanced LIBs and beyond. 相似文献
8.
Multishelled NixCo3–xO4 Hollow Microspheres Derived from Bimetal–Organic Frameworks as Anode Materials for High‐Performance Lithium‐Ion Batteries
下载免费PDF全文
![点击此处可从《Small (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Lan‐Lan Wu Zhuo Wang Yan Long Jian Li Yu Liu Qi‐Shun Wang Xiao Wang Shu‐Yan Song Xiaogang Liu Hong‐Jie Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(17)
Metal–organic frameworks (MOFs) featuring versatile topological architectures are considered to be efficient self‐sacrificial templates to achieve mesoporous nanostructured materials. A facile and cost‐efficient strategy is developed to scalably fabricate binary metal oxides with complex hollow interior structures and tunable compositions. Bimetal–organic frameworks of Ni‐Co‐BTC solid microspheres with diverse Ni/Co ratios are readily prepared by solvothermal method to induce the Ni x Co3? x O4 multishelled hollow microspheres through a morphology‐inherited annealing treatment. The obtained mixed metal oxides are demonstrated to be composed of nanometer‐sized subunits in the shells and large void spaces left between adjacent shells. When evaluated as anode materials for lithium‐ion batteries, Ni x Co3? x O4‐0.1 multishelled hollow microspheres deliver a high reversible capacity of 1109.8 mAh g?1 after 100 cycles at a current density of 100 mA g?1 with an excellent high‐rate capability. Appropriate capacities of 832 and 673 mAh g?1 could also be retained after 300 cycles at large currents of 1 and 2 A g?1, respectively. These prominent electrochemical properties raise a concept of synthesizing MOFs‐derived mixed metal oxides with multishelled hollow structures for progressive lithium‐ion batteries. 相似文献
9.
Ping Wang Mengqi Shen Hu Zhou Chunfeng Meng Aihua Yuan 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(47)
The CuS(x wt%)@Cu‐BTC (BTC = 1,3,5‐benzenetricarboxylate; x = 3, 10, 33, 58, 70, 99.9) materials are synthesized by a facile sulfidation reaction. The composites are composed of octahedral Cu3(BTC)2·(H2O)3 (Cu‐BTC) with a large specific surface area and CuS with a high conductivity. The as‐prepared CuS@Cu‐BTC products are first applied as the anodes of lithium‐ion batteries (LIBs). The synergistic effect between Cu‐BTC and CuS components can not only accommodate the volume change and stress relaxation of electrodes but also facilitate the fast transport of Li ions. Thus, it can greatly suppress the transformation process from Li2S to polysulfides by improving the reversibility of the conversion reaction. Benefiting from the unique structural features, the optimal CuS(70 wt%)@Cu‐BTC sample exhibits a remarkably improved electrochemical performance, showing an over‐theoretical capacity up to 1609 mAh g?1 after 200 cycles (100 mA g?1) with an excellent rate‐capability of ≈490 mAh g?1 at 1000 mA g?1. The outstanding LIB properties indicate that the CuS(70 wt%)@Cu‐BTC sample is a highly desirable electrode material candidate for high‐performance LIBs. 相似文献
10.
Jun Yang Manjing Tang Hao Liu Xueying Chen Zhanwei Xu Jianfeng Huang Qingmei Su Yongyao Xia 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(52)
Inspired by its high‐active and open layered framework for fast Li+ extraction/insertion reactions, layered Ni‐rich oxide is proposed as an outstanding Na‐intercalated cathode for high‐performance sodium‐ion batteries. An O3‐type Na0.75Ni0.82Co0.12Mn0.06O2 is achieved through a facile electrochemical ion‐exchange strategy in which Li+ ions are first extracted from the LiNi0.82Co0.12Mn0.06O2 cathode and Na+ ions are then inserted into a layered oxide framework. Furthermore, the reaction mechanism of layered Ni‐rich oxide during Na+ extraction/insertion is investigated in detail by combining ex situ X‐ray diffraction, X‐ray photoelectron spectroscopy, and electron energy loss spectroscopy. As an excellent cathode for Na‐ion batteries, O3‐type Na0.75Ni0.82Co0.12Mn0.06O2 delivers a high reversible capacity of 171 mAh g?1 and a remarkably stable discharge voltage of 2.8 V during long‐term cycling. In addition, the fast Na+ transport in the cathode enables high rate capability with 89 mAh g?1 at 9 C. The as‐prepared Ni‐rich oxide cathode is expected to significantly break through the limited performance of current sodium‐ion batteries. 相似文献
11.
Zhonghui Sun Xing‐Long Wu Jianan Xu Dongyang Qu Bolin Zhao Zhenyi Gu Wenhao Li Haojie Liang Lifang Gao Yingying Fan Kai Zhou Dongxue Han Shiyu Gan Yuwei Zhang Li Niu 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(19)
Metallic selenides have been widely investigated as promising electrode materials for metal‐ion batteries based on their relatively high theoretical capacity. However, rapid capacity decay and structural collapse resulting from the larger‐sized Na+/K+ greatly hamper their application. Herein, a bimetallic selenide (MoSe2/CoSe2) encapsulated in nitrogen, sulfur‐codoped hollow carbon nanospheres interconnected reduced graphene oxide nanosheets (rGO@MCSe) are successfully designed as advanced anode materials for Na/K‐ion batteries. As expected, the significant pseudocapacitive charge storage behavior substantially contributes to superior rate capability. Specifically, it achieves a high reversible specific capacity of 311 mAh g?1 at 10 A g?1 in NIBs and 310 mAh g?1 at 5 A g?1 in KIBs. A combination of ex situ X‐ray diffraction, Raman spectroscopy, and transmission electron microscopy tests reveals the phase transition of rGO@MCSe in NIBs/KIBs. Unexpectedly, they show quite different Na+/K+ insertion/extraction reaction mechanisms for both cells, maybe due to more sluggish K+ diffusion kinetics than that of Na+. More significantly, it shows excellent energy storage properties in Na/K‐ion full cells when coupled with Na3V2(PO4)2O2F and PTCDA@450 °C cathodes. This work offers an advanced electrode construction guidance for the development of high‐performance energy storage devices. 相似文献
12.
Novel 2D Layered Molybdenum Ditelluride Encapsulated in Few‐Layer Graphene as High‐Performance Anode for Lithium‐Ion Batteries
下载免费PDF全文
![点击此处可从《Small (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Ning Ma Xiao‐Yu Jiang Lu Zhang Xiao‐Shuang Wang Yu‐Liang Cao Xian‐Zheng Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(14)
Molybdenum ditelluride nanosheets encapsulated in few‐layer graphene (MoTe2/FLG) are synthesized by a simple heating method using Te and Mo powder and subsequent ball milling with graphite. The as‐prepared MoTe2/FLG nanocomposites as anode materials for lithium‐ion batteries exhibit excellent electrochemical performance with a highly reversible capacity of 596.5 mAh g?1 at 100 mA g?1, a high rate capability (334.5 mAh g?1 at 2 A g?1), and superior cycling stability (capacity retention of 99.5% over 400 cycles at 0.5 A g?1). Ex situ X‐ray diffraction and transmission electron microscopy are used to explore the lithium storage mechanism of MoTe2. Moreover, the electrochemical performance of a MoTe2/FLG//0.35Li2MnO3·0.65LiMn0.5Ni0.5O2 full cell is investigated, which displays a reversible capacity of 499 mAh g?1 (based on the MoTe2/FLG mass) at 100 mA g?1 and a capacity retention of 78% over 50 cycles, suggesting the promising application of MoTe2/FLG for lithium‐ion storage. First‐principles calculations exhibit that the lowest diffusion barrier (0.18 eV) for lithium ions along pathway III in the MoTe2 layered structure is beneficial for improving the Li intercalation/deintercalation property. 相似文献
13.
Changmiao Chen Yincai Yang Xuan Tang Renhua Qiu Shuangyin Wang Guozhong Cao Ming Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(10)
Developing low cost, long life, and high capacity rechargeable batteries is a critical factor towards developing next‐generation energy storage devices for practical applications. Therefore, a simple method to prepare graphene‐coated FeS2 embedded in carbon nanofibers is employed; the double protection from graphene coating and carbon fibers ensures high reversibility of FeS2 during sodiation/desodiation and improved conductivity, resulting in high rate capacity and long‐term life for Na+ (305.5 mAh g?1 at 3 A g?1 after 2450 cycles) and K+ (120 mAh g?1 at 1 A g?1 after 680 cycles) storage at room temperature. Benefitting from the enhanced conductivity and protection on graphene‐encapsulated FeS2 nanoparticles, the composites exhibit excellent electrochemical performance under low temperature (0 and ?20 °C), and temperature tolerance with stable capacity as sodium‐ion half‐cells. The Na‐ion full‐cells based on the above composites and Na3V2(PO4)3 can afford reversible capacity of 95 mAh g?1 at room temperature. Furthermore, the full‐cells deliver promising discharge capacity (50 mAh g?1 at 0 °C, 43 mAh g?1 at ?20 °C) and high energy density at low temperatures. Density functional theory calculations imply that graphene coating can effectively decrease the Na+ diffusion barrier between FeS2 and graphene heterointerface and promote the reversibility of Na+ storage in FeS2, resulting in advanced Na+ storage properties. 相似文献
14.
Chaofan Yang Yong Li Yang Chen Qiaodan Li Lulu Wu Xiaoli Cui 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(8)
γ‐Graphyne is a new nanostructured carbon material with large theoretical Li+ storage due to its unique large conjugate rings, which makes it a potential anode for high‐capacity lithium‐ion batteries (LIBs). In this work, γ‐graphyne‐based high‐capacity LIBs are demonstrated experimentally. γ‐Graphyne is synthesized through mechanochemical and calcination processes by using CaC2 and C6Br6. Brunauer–Emmett–Teller, atomic force microscopy, X‐ray photoelectron spectroscopy, solid‐state 13C NMR and Raman spectra are conducted to confirm its morphology and chemical structure. The sample presents 2D mesoporous structure and is exactly composed of sp and sp2‐hybridized carbon atoms as the γ‐graphyne structure. The electrode shows high Li+ storage (1104.5 mAh g?1 at 100 mA g?1) and rate capability (435.1 mAh g?1 at 5 A g?1). The capacity retention can be up to 948.6 (200 mA g?1 for 350 cycles) and 730.4 mAh g?1 (1 A g?1 for 600 cycles), respectively. These excellent electrochemical performances are ascribed to the mesoporous architecture, large conjugate rings, enlarged interplanar distance, and high structural integrity for fast Li+ diffusion and improved cycling stability in γ‐graphyne. This work provides an environmentally benign and cost‐effective mechanochemical method to synthesize γ‐graphyne and demonstrates its superior Li+ storage experimentally. 相似文献
15.
A Robust and Conductive Black Tin Oxide Nanostructure Makes Efficient Lithium‐Ion Batteries Possible
下载免费PDF全文
![点击此处可从《Advanced materials (Deerfield Beach, Fla.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Wujie Dong Jijian Xu Chao Wang Yue Lu Xiangye Liu Xin Wang Xiaotao Yuan Zhe Wang Tianquan Lin Manling Sui I‐Wei Chen Fuqiang Huang 《Advanced materials (Deerfield Beach, Fla.)》2017,29(24)
SnO2‐based lithium‐ion batteries have low cost and high energy density, but their capacity fades rapidly during lithiation/delithiation due to phase aggregation and cracking. These problems can be mitigated by using highly conducting black SnO2?x , which homogenizes the redox reactions and stabilizes fine, fracture‐resistant Sn precipitates in the Li2O matrix. Such fine Sn precipitates and their ample contact with Li2O proliferate the reversible Sn → Li x Sn → Sn → SnO2/SnO2?x cycle during charging/discharging. SnO2?x electrode has a reversible capacity of 1340 mAh g?1 and retains 590 mAh g?1 after 100 cycles. The addition of highly conductive, well‐dispersed reduced graphene oxide further stabilizes and improves its performance, allowing 950 mAh g?1 remaining after 100 cycles at 0.2 A g?1 with 700 mAh g?1 at 2.0 A g?1. Conductivity‐directed microstructure development may offer a new approach to form advanced electrodes. 相似文献
16.
Qing Li Guozhen Zhu Yunhao Zhao Ke Pei Renchao Che 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(15)
The combination of high‐capacity and long‐term cycling stability is an important factor for practical application of anode materials for lithium‐ion batteries. Herein, NixMnyCozO nanowire (x + y + z = 1)/carbon nanotube (CNT) composite microspheres with a 3D interconnected conductive network structure (3DICN‐NCS) are prepared via a spray‐drying method. The 3D interconnected conductive network structure can facilitate the penetration of electrolyte into the microspheres and provide excellent connectivity for rapid Li+ ion/electron transfer in the microspheres, thus greatly reducing the concentration polarization in the electrode. Additionally, the empty spaces among the nanowires in the network accommodate microsphere volume expansion associated with Li+ intercalation during the cycling process, which improves the cycling stability of the electrode. The CNTs distribute uniformly in the microspheres, which act as conductive frameworks to greatly improve the electrical conductivity of the microspheres. As expected, the prepared 3DICN‐NCS demonstrates excellent electrochemical performance, showing a high capacity of 1277 mAh g?1 at 1 A g?1 after 2000 cycles and 790 mAh g?1 at 5 A g?1 after 1000 cycles. This work demonstrates a universal method to construct a 3D interconnected conductive network structure for anode materials 相似文献
17.
Baoqiang Li Yi Liu Xu Jin Shuhong Jiao Gongrui Wang Bo Peng Suyuan Zeng Liang Shi Jianming Li Genqiang Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(42)
Research on sodium‐ion batteries (SIBs) has recently been revitalized due to the unique features of much lower costs and comparable energy/power density to lithium‐ion batteries (LIBs), which holds great potential for grid‐level energy storage systems. Transition metal dichalcogenides (TMDCs) are considered as promising anode candidates for SIBs with high theoretical capacity, while their intrinsic low electrical conductivity and large volume expansion upon Na+ intercalation raise the challenging issues of poor cycle stability and inferior rate performance. Herein, the designed formation of hybrid nanoboxes composed of carbon‐protected CoSe2 nanoparticles anchored on nitrogen‐doped carbon hollow skeletons (denoted as CoSe2@C∩NC) via a template‐assisted refluxing process followed by conventional selenization treatment is reported, which exhibits tremendously enhanced electrochemical performance when applied as the anode for SIBs. Specifically, it can deliver a high reversible specific capacity of 324 mAh g?1 at current density of 0.1 A g?1 after 200 cycles and exhibit outstanding high rate cycling stability at the rate of 5 A g?1 over 2000 cycles. This work provides a rational strategy for the design of advanced hybrid nanostructures as anode candidates for SIBs, which could push forward the development of high energy and low cost energy storage devices. 相似文献
18.
Surface Coating Constraint Induced Anisotropic Swelling of Silicon in Si–Void@SiO
x
Nanowire Anode for Lithium‐Ion Batteries
下载免费PDF全文
![点击此处可从《Small (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Qian Liu Zhe Cui Rujia Zou Jianhua Zhang Kaibing Xu Junqing Hu 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(13)
Here a simple and an environmentally friendly approach is developed for the fabrication of Si–void@SiOx nanowires of a high‐capacity Li‐ion anode material. The outer surface of the robust SiOx backbone and the inside void structure in Si–void@SiOx nanowires appropriately suppress the volume expansion and lead to anisotropic swelling morphologies of Si nanowires during lithiation/delithiation, which is first demonstrated by the in situ lithiation process. Remarkably, the Si–void@SiOx nanowire electrode exhibits excellent overall lithium‐storage performance, including high specific capacity, high rate property, and excellent cycling stability. A reversible capacity of 1981 mAh g?1 is obtained in the fourth cycle, and the capacity is maintained at 2197 mAh g?1 after 200 cycles at a current density of 0.5 C. The outstanding overall properties of the Si–void@SiOx nanowire composite make it a promising anode material of lithium‐ion batteries for the power‐intensive energy storage applications. 相似文献
19.
Xiaona Li Jianwen Liang Jing Luo Changhong Wang Xia Li Qian Sun Ruying Li Li Zhang Rong Yang Shigang Lu Huan Huang Xueliang Sun 《Advanced materials (Deerfield Beach, Fla.)》2019,31(17)
All‐solid‐state Li–S batteries are promising candidates for next‐generation energy‐storage systems considering their high energy density and high safety. However, their development is hindered by the sluggish electrochemical kinetics and low S utilization due to high interfacial resistance and the electronic insulating nature of S. Herein, Se is introduced into S cathodes by forming SeSx solid solutions to modify the electronic and ionic conductivities and ultimately enhance cathode utilization in all‐solid‐state lithium batteries (ASSLBs). Theoretical calculations confirm the redistribution of electron densities after introducing Se. The interfacial ionic conductivities of all achieved SeSx–Li3PS4 (x = 3, 2, 1, and 0.33) composites are 10?6 S cm?1. Stable and highly reversible SeSx cathodes for sulfide‐based ASSLBs can be developed. Surprisingly, the SeS2/Li10GeP2S12–Li3PS4/Li solid‐state cells exhibit excellent performance and deliver a high capacity over 1100 mAh g?1 (98.5% of its theoretical capacity) at 50 mA g?1 and remained highly stable for 100 cycles. Moreover, high loading cells can achieve high areal capacities up to 12.6 mAh cm?2. This research deepens the understanding of Se–S solid solution chemistry in ASSLB systems and offers a new strategy to achieve high‐performance S‐based cathodes for application in ASSLBs. 相似文献
20.
Yang Liu Dandan He Yingjie Cheng Lin Li Zhansheng Lu Rui Liang Yangyang Fan Yun Qiao Shulei Chou 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(11)
Prussian blue (PB) and its analogues are recognized as promising cathodes for rechargeable batteries intended for application in low‐cost and large‐scale electric energy storage. With respect to PB cathodes, however, their intrinsic crystal regularity, vacancies, and coordinated water will lead to low specific capacity and poor rate performance, impeding their application. Herein, nanocubic porous NaxFeFe(CN)6 coated with polydopamine (PDA) as a coupling layer to improve its electrochemical performance is reported, inspired by the excellent adhesive property of PDA. As a cathode for sodium‐ion batteries, the NaxFeFe(CN)6 electrode coupled with PDA delivers a reversible capacity of 93.8 mA h g?1 after 500 cycles at 0.2 A g?1, and a discharge capacity of 72.6 mA h g?1 at 5.0 A g?1. The sodium storage mechanism of this NaxFeFe(CN)6 coupled with PDA is revealed via in situ Raman spectroscopy. The first‐principles computational results indicate that FeII sites in PB prefer to couple with the robust PDA layer to stabilize the PB structure. Moreover, the sodium‐ion migration in the PB structure is enhanced after coating with PDA, thus improving the sodium storage properties. Both experiments and computational simulations present guidelines for the rational design of nanomaterials as electrodes for energy storage devices. 相似文献