共查询到20条相似文献,搜索用时 15 毫秒
1.
Ge Mu Daobin Mu Borong Wu Chengwei Ma Jiaying Bi Ling Zhang Hao Yang Feng Wu 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(3)
To address the non‐negligible volume expansion and the inherent poor electronic conductivity of silica (SiO2) material, microsphere‐like SiO2/MXene hybrid material is designed and successfully synthesized through the combination of the Stöber method and spray drying. The SiO2 nanoparticles are firmly anchored on the laminated MXene by the bonding effect, which boosts the structural stability during the long‐term cycling process. The MXene matrix not only possesses high elasticity to buffer the volume variation of SiO2 nanoparticles, but also promotes the transfer of electrons and lithium ions. Moreover, the microsphere wrapped with ductile MXene film reduces the specific surface area, relieves the side reactions, and enhances the coulombic efficiency. Therefore, superior electrochemical performance including high reversible capacity, outstanding cycle stability, high coulombic efficiency, especially in the first cycle, excellent rate capability as well as high areal capacity are acquired for SiO2/MXene microspheres anode. 相似文献
2.
Li‐Ping Lv Chao‐Fei Guo Weiwei Sun Yong Wang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(3)
In this work, hydroxyl‐functionalized Mo2C‐based MXene nanosheets are synthesized by facilely removing the Sn layer of Mo2SnC. The hydroxyl‐functionalized surface of Mo2C suppresses the shuttle effect of lithium polysulfides (LiPSs) through strong interaction between Mo atoms on the MXenes surface and LiPSs. Carbon nanotubes (CNTs) are further introduced into Mo2C phase to enlarge the specific surface area of the composite, improve its electronic conductivity, and alleviate the volume change during discharging/charging. The strong surface‐bound sulfur in the hierarchical Mo2C‐CNTs host can lead to a superior electrochemical performance in lithium–sulfur batteries. A large reversible capacity of ≈925 mAh g ? 1 is observed after 250 cycles at a current density of 0.1 C (1 C = 1675 mAh g?1) with good rate capability. Notably, the electrodes with high loading amounts of sulfur can also deliver good electrochemical performances, i.e., initial reversible capacities of ≈1314 mAh g?1 (2.4 mAh cm?2), ≈1068 mAh g?1 (3.7 mAh cm?2), and ≈959 mAh g?1 (5.3 mAh cm?2) at various areal loading amounts of sulfur (1.8, 3.5, and 5.6 mg cm?2) are also observed, respectively. 相似文献
3.
Lanju Sun Jikai Sun Shengliang Zhai Hongyan Yang Xiaokang Chen Wei-Qiao Deng Hao Wu 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(26):2300914
Previously, heat treatment was the only feasible route for tuning the crystal phases of niobium pentoxide (Nb2O5). With the use of Nb2CTx MXene precursors, the first case of phase tuning of Nb2O5 in the low-temperature hydrothermal synthesis using sulfuric acid regulating agents is presented. By varying the amount of the agent, four pure-phase Nb2O5 crystals and mixed phases in-between are obtained. The required amount is found to be related to the H-covered surface energy calculated based on density functional theory. Overall, MXene-derived B-phase Nb2O5 is of particular interest due to its exceptionally high capacities as lithium-ion battery anodes, which are three times higher than the routine synthesized one. Oxygen vacancies induced by crystallographic shear would be responsible for the extraordinary performance. The proposed phase tuning strategy encourages the prudent synthesis of difficult-to-obtain crystal phases. 相似文献
4.
Amar Kumar Raheel Hammad Mansi Pahuja Raul Arenal Kaushik Ghosh Soumya Ghosh Tharangattu N. Narayanan 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(38):2303319
Photo-rechargeable (solar) battery can be considered as an energy harvesting cum storage system, where it can charge the conventional metal-ion battery using light instead of electricity, without having other parasitic reactions. Here a two-electrode lithium-ion solar battery with multifaceted TiS2–TiO2 hybrid sheets as cathode. The choice of TiS2–TiO2 electrode ensures the formation of a type II semiconductor heterostructure while the lateral heterostructure geometry ensures high mass/charge transfer and light interactions with the electrode. TiS2 has a higher lithium binding energy (1.6 eV) than TiO2 (1.03 eV), ensuring the possibilities of higher amount of Li-ion insertion to TiS2 and hence the maximum recovery with the photocharging, as further confirmed by the experiments. Apart from the demonstration of solar solid-state batteries, the charging of lithium-ion full cell with light indicates the formation of lithium intercalated graphite compounds, ensuring the charging of the battery without any other parasitic reactions at the electrolyte or electrode-electrolyte interfaces. Possible mechanisms proposed here for the charging and discharging processes of solar batteries, based on the experimental and theoretical results, indicate the potential of such systems in the forthcoming era of renewable energies. 相似文献
5.
6.
Yuqin Huang Panyu Gao Tengfei Zhang Xiang Zhang Guanglin Xia Fang Fang Dalin Sun Zaiping Guo Xuebin Yu 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(26):2207210
The low ionic and electronic conductivity between current solid electrolytes and high-capacity anodes limits the long-term cycling performance of all-solid-state lithium-ion batteries (ASSLIBs). Herein, this work reports the fabrication of an ultra-stable electrode-solid electrolyte composite for high-performance ASSLIBs enabled by the homogeneous coverage of ultrathin Mg(BH4)2 layers on the surface of each MgH2 nanoparticle that are uniformly distributed on graphene. The initial discharge process of Mg(BH4)2 layers results in uniform coverage of MgH2 nanoparticle with both LiBH4 as the solid electrolyte and Li2B6 with even higher Li ion conductivity than LiBH4. Consequently, the Li ion conductivity of graphene-supported MgH2 nanoparticles covered with ultrathin Mg(BH4)2 layers is two orders of magnitude higher than that without Mg(BH4)2 layers. Moreover, the thus-formed inactive Li2B6 with strong adsorption capability toward LiBH4, acts as a stabilizing framework, which, coupled with the structural support role of graphene, alleviates the volume change of MgH2 nanoparticles and facilitates the intimate contact between LiBH4 and individual MgH2 nanoparticles, leading to the formation of uniform stable interfaces with high ionic and electronic conductivity on each MgH2 nanoparticles. Hence, an ultrahigh specific capacity of 800 mAh g−1 is achieved for MgH2 at 2 A g−1 after 350 cycles. 相似文献
7.
Svetlana G. Stolyarova Victor O. Koroteev Kseniya I. Baskakova Anna A. Makarova Alexander V. Okotrub Lyubov G. Bulusheva 《Fullerenes, Nanotubes and Carbon Nanostructures》2020,28(4):328-334
AbstractThe ratio between the components determines the capacity of MoS2/carbon materials in lithium-ion batteries (LIB). However, the structure of the carbon component and the synthesis conditions determine the amount of MoS2 that can be efficiently used in each particular case. We study the influence of components ratio in MoS2/multilayer holey graphene (HG) materials on the capacity in LIB. The synthesis was carried out by hot pressing of MoS3 and HG mixtures at 600?°C and 100?bar. These synthesis conditions resulted in the decomposition of MoS3 with the formation of MoS2 nanocrystals. Optimal component distribution and better cycling performance, reaching 591 mAh g?1 at a current density of 0.1?A g?1 and 408 mAh g?1 at 1?A g?1, were found for MoS2/HG containing 30?wt.% of MoS2. An increase of the MoS2 ratio led to a decrease of cycling stability and capacity of the material. 相似文献
8.
Jianqiao Wang Ze Wu Youqiang Xing Bingjue Li Peng Huang Lei Liu 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(14):2207051
Developing various nanocomposite microwave absorbers is a crucial means to address the issue of electromagnetic pollution, but remains a challenge in satisfying broadband absorption at low thickness with dielectric loss materials. Herein, an ultra-broadband microwave metamaterial absorber (MMA) based on hollow carbon/MXene/Mo2C (HCMM) is fabricated by a multi-scale design strategy. The microscopic 1D hierarchical microtube structure of HCMM contributes to break through the limit of thickness, exhibiting a strong reflection loss of -66.30 dB (99.99997 wave absorption) at the thinnest matching thickness of 1.0 mm. Meanwhile, the strongest reflection loss of -87.28 dB is reached at 1.4 mm, superior to most MXene-based and Mo2C-based microwave absorbers. Then, the macroscopic 3D structural metasurface based on the HCMM is simulated, optimized, and finally manufactured. The as-prepared flexible HCMM-based MMA realizes an ultra-broadband effective absorption in the range of 3.7-40.0 GHz at a thickness of 5.0 mm, revealing its potential for practical application in the electromagnetic compatibility field. 相似文献
9.
Sekar Praveen Taehyung Kim Soon Phil Jung Chang Woo Lee 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(3):2205817
Stretchable energy storage devices receive a considerable attention at present due to their growing demand for powering wearable electronics. A vital component in stretchable energy storage devices is its electrode which should endure a large and repeated number of mechanical deformations during its prolonged use. It is crucial to develop a technology to fabricate highly deformable electrode in an easy and an economic manner. Here, the fabrication of stretchable electrode substrates using 3D-printing technology is reported. The ink for fabricating it contains a mixture of sacrificial sugar particles and polydimethylsiloxane resin which solidifies upon thermal curing. The printed stretchable substrate attains a porous structure after leaching the sugar particles in water. The resulting printed porous stretchable substrates are then utilized as electrodes for Li-ion batteries (LIBs) after loading them with electrode materials. The batteries with stretchable electrodes exhibit a decent electrochemical performance comparable to that of the conventional electrodes. The stretchable electrodes also exhibit a stable electrochemical performance under various mechanical deformations and even after several hundreds of stretch/release cycles. This work provides a feasible route for constructing LIBs with high stretchability and enhanced electrochemical performance thereby providing a platform for realizing stretchable batteries for next generation wearable electronics. 相似文献
10.
Chao Jia An Duan Chao Liu Wen-Zhuang Wang Shi-Xian Gan Qiao-Yan Qi Yongjun Li Xiaoyu Huang Xin Zhao 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(24):2300518
Covalent organic frameworks (COFs) have emerged as a new class of cathode materials for energy storage in recent years. However, they are limited to two-dimensional (2D) or three-dimensional (3D) framework structures. Herein, this work reports designed synthesis of a redox-active one-dimensional (1D) COF and its composites with 1D carbon nanotubes (CNTs) via in situ growth. Used as cathode materials for Li-ion batteries, the 1D COF@CNT composites with unique dendritic core–shell structure can provide abundant and easily accessible redox-active sites, which contribute to improve diffusion rate of lithium ions and the corresponding specific capacity. This synergistic structural design enables excellent electrochemical performance of the cathodes, giving rise to 95% utilization of redox-active sites, high rate capability (81% capacity retention at 10 C), and long cycling stability (86% retention after 600 cycles at 5 C). As the first example to explore the application of 1D COFs in the field of energy storage, this study demonstrates the great potential of this novel type of linear crystalline porous polymers in battery technologies. 相似文献
11.
12.
Yu-xin Chen Hong-chang Liu Wei-qi Xie Ze Shen Jin-lan Xia Zhen-yuan Nie Jian-ping Xie 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(30):2300707
Silica is regarded as a promising anode material for lithium-ion batteries (LIBs) because of its high theoretical capacity. However, large volume variation and poor electrical conductivity are limiting factors for the development of SiO2 anode materials. To solve this problem, combining SiO2 with a conductive phase and designing hollow porous structures are effective ways. In this work, The Co(II)-EDTA chelate on the surface of diatom biosilica (DBS) frustules and obtained DBS@C-Co composites decorated with Co nanoparticles by calcination without a reducing atmosphere is first precipitated. The unique three-dimensional structure of diatom frustules provides enough space for the volume change of silica during lithiation/delithiation. Co nanoparticles effectively improve the electrical conductivity and electrochemical activity of silica. Through the synergistic effect of the hollow porous structure, carbon layer and Co nanoparticles, the DBS@C-Co-60 composite delivers a high reversible capacity of >620 mAh g−1 at 100 mA g−1 after 270 cycles. This study provides a new method for the synthesis of metal/silica composites and an opportunity for the development of natural resources as advanced active materials for LIBs. 相似文献
13.
Jili Xu Heng Wang Ting He Xiao Yan Jia Yu Jingkun Bi Daixin Ye Wenli Yao Ya Tang Hongbin Zhao Jiujun Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(29):2300042
Modifying sulfur cathodes with lithium polysulfides (LiPSs) adsorptive and electrocatalytic host materials is regarded as one of the most effective approaches to address the challenging problems in lithium-sulfur (Li-S) batteries. However, because of the high operating voltage window of Li–S batteries from 1.7 to 2.8 V, most of the host materials cannot participate in the sulfur redox reactions within the same potential region, which exhibit fixed or single functional property, hardly fulfilling the requirement of the complex and multiphase process. Herein, Chevrel phase Mo6S8 nanosheets with high electronic conductivity, fast ion transport capability, and strong polysulfide affinity are introduced to sulfur cathode. Unlike most previous inactive hosts with a fixed affinity or catalytic ability toward LiPSs, the reaction involving Mo6S8 is intercalative and the adsorbability for LiPSs as well as the ionic conductivity can be dynamically enhanced via reversible electrochemical lithiation of Mo6S8 to Li-ion intercalated LixMo6S8, thereby suppressing the shuttling effect and accelerating the conversion kinetics. Consequently, the Mo6S8 nanosheets act as an effective dynamic-phase promoter in Li–S batteries and exhibit superior cycling stability, high-rate capability, and low-temperature performance. This study opens a new avenue for the development of advanced hosts with dynamic regulation activity for high performance Li-S batteries. 相似文献
14.
Peng Tan Bin Chen Haoran Xu Weizi Cai Wei He Meilin Liu Zongping Shao Meng Ni 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(21)
The rapid development of electric vehicles and modern personal electronic devices is severely hindered by the limited energy and power density of the existing power sources. Here a novel hybrid Zn battery is reported which is composed of a nanostructured transition metal oxide‐based positive electrode (i.e., Co3O4 nanosheets grown on carbon cloth) and a Zn foil negative electrode in an aqueous alkaline electrolyte. The hybrid battery configuration successfully combines the unique advantages of a Zn–Co3O4 battery and a Zn–air battery, achieving a high voltage of 1.85 V in the Zn–Co3O4 battery region and a high capacity of 792 mAh gZn?1. In addition, the battery shows high stability while maintaining high energy efficiency (higher than 70%) for over 200 cycles and high rate capabilities. Furthermore, the high flexibility of the carbon cloth substrate allows the construction of a flexible battery with a gel electrolyte, demonstrating not only good rechargeability and stability, but also reasonable mechanical deformation without noticeable degradation in performance. This work also provides an inspiring example for further explorations of high‐performance hybrid and flexible battery systems. 相似文献
15.
Baozhong Deng Hong Lian Baotong Xue Ruichen Song Shi Chen Zihan Wang Tao Xu Hongliang Dong Shenghao Wang 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(23):2207505
Niobium-carbide (Nb2C) MXene as a new 2D material has shown great potential for application in photovoltaics due to its excellent electrical conductivity, large surface area, and superior transmittance. In this work, a novel solution-processable poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS)-Nb2C hybrid hole transport layer (HTL) is developed to enhance the device performance of organic solar cells (OSCs). By optimizing the doping ratio of Nb2C MXene in PEDOT:PSS, the best power convention efficiency (PCE) of 19.33% can be achieved for OSCs based on the ternary active layer of PM6:BTP-eC9:L8-BO, which is so far the highest value among those of single junction OSCs using 2D materials. It is found that the addition of Nb2C MXene can facilitate the phase separation of the PEDOT and PSS segments, thus improving the conductivity and work function of PEDOT:PSS. The significantly enhanced device performance can be attributed to the higher hole mobility and charge extraction capability, as well as lower interface recombination probabilities generated by the hybrid HTL. Additionally, the versatility of the hybrid HTL to improve the performance of OSCs based on different nonfullerene acceptors is demonstrated. These results indicate the promising potential of Nb2C MXene in the development of high-performance OSCs. 相似文献
16.
Fucong Lyu Shanshan Zeng Zhifang Sun Ning Qin Lujie Cao Zhenyu Wang Zhe Jia Shaofei Wu Fei‐Xiang Ma Minchan Li Wenxi Wang Yang Yang Li Jian Lu Zhouguang Lu 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(8)
Layered stacking and highly porous N, P co‐doped Mo2C/C nanosheets are prepared from a stable Mo‐enhanced hydrogel. The hydrogel is formed through the ultrafast cross‐linking of phosphomolybdic acid and chitosan. During the reduction of the composite hydrogel framework under inert gas protection, highly porous N and P co‐doped carbon nanosheets are produced with the in situ formation of ultrafine Mo2C nanoparticles highly distributed throughout the nanosheets which are entangled via a hierarchical lamellar infrastructure. This unique architecture of the N, P co‐doped Mo2C/C nanosheets tremendously promote the electrochemical activity and operate stability with high specific capacity and extremely stable cycling. In particular, this versatile synthetic strategy can also be extended to other polyoxometalate (such as phosphotungstic acid) to provide greater opportunities for the controlled fabrication of novel hierarchical nanostructures for next‐generation high performance energy storage applications. 相似文献
17.
Chunhui Wu Guicai Qi Junxiang Zhang Jianli Cheng Bin Wang 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(44):2302078
Li-CO2 battery with high energy density has aroused great interest recently, large-scale applications are hindered by the limited cathode catalysis performance and execrably cycle performance. Herein, Mo3P/Mo Mott-Schottky heterojunction nanorod electrocatalyst with abundant porous structure is fabricated and served as cathodes for Li-CO2 batteries. The Mo3P/Mo cathodes exhibit ultra-high discharge specific capacity of 10 577 mAh g−1, low polarization voltage of 0.15 V, and high energy efficiency of up to 94.7%. Mott-Schottky heterojunction formed by Mo and Mo3P drives electron transfer and optimizes the surface electronic structure, which is beneficial to accelerate the interface reaction kinetics. Distinctively, during the discharge process, the C2O42− intermediates combine with Mo atoms to form a stable Mo-O coupling bridge on the catalyst surface, which effectively facilitate the formation and stabilization of Li2C2O4 products. In addition, the construction of the Mo-O coupling bridge between the Mott-Schottky heterojunction and Li2C2O4 promotes the reversible formation and decomposition of discharge products and optimizes the polarization performance of the Li-CO2 battery. This work provides another pathway for the development of heterostructure engineering electrocatalysts for high-performance Li-CO2 batteries. 相似文献
18.
Subramanian Natarajan Manohar Akshay Vanchiappan Aravindan 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(17):2206226
The advantage of hybridizing battery and supercapacitor electrodes has succeeded recently in designing hybrid charge storage systems such as lithium-ion capacitors (LICs) with the benefits of higher energy than supercapacitors and more power density than batteries. However, sluggish Li-ion diffusion of battery anode is one of the main barriers and hampers the development of high-performance LICs. Herein, is introduced a new conversion/displacement type anode, MnCO3, via effectively recycling spent Li-ion batteries cathodes for LICs applications. The MnCO3 cuboids are regenerated from the spent LiMn2O4 cathodes by organic acid lixiviation process, and hydrothermal treatment displays excellent reversibility of 535 mAh g−1 after 50 cycles with a Coulombic efficiency of >99%. Later, LIC is assembled with the regenerated MnCO3 cubes in pre-lithiated form (Mn0 + Li2CO3) as anode and commercial activated carbon (AC) as the cathode, delivering a maximum energy density of 169.4 Wh kg−1 at 25 °C with ultra-long durability of 15,000 cycles. Even at various atmospheres like −5 and 50 °C, this LIC can offer a energy densities of 53.8 and 119.5 Wh kg−1, respectively. Remarkably, the constructed AC/Mn0 + Li2CO3-based LIC exhibits a good cycling performance for a continuous 1000 cycles with >91% retention invariably for all temperature conditions. 相似文献
19.
Dongbin Xiong Xifei Li Zhimin Bai Shigang Lu 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(17)
Ti3C2Tx, a typical representative among the emerging family of 2D layered transition metal carbides and/or nitrides referred to as MXenes, has exhibited multiple advantages including metallic conductivity, a plastic layer structure, small band gaps, and the hydrophilic nature of its functionalized surface. As a result, this 2D material is intensively investigated for application in the energy storage field. The composition, morphology and texture, surface chemistry, and structural configuration of Ti3C2Tx directly influence its electrochemical performance, e.g., the use of a well‐designed 2D Ti3C2Tx as a rechargeable battery anode has significantly enhanced battery performance by providing more chemically active interfaces, shortened ion‐diffusion lengths, and improved in‐plane carrier/charge‐transport kinetics. Some recent progresses of Ti3C2Tx MXene are achieved in energy storage. This Review summarizes recent advances in the synthesis and electrochemical energy storage applications of Ti3C2Tx MXene including supercapacitors, lithium‐ion batteries, sodium‐ion batteries, and lithium–sulfur batteries. The current opportunities and future challenges of Ti3C2Tx MXene are addressed for energy‐storage devices. This Review seeks to provide a rational and in‐depth understanding of the relation between the electrochemical performance and the nanostructural/chemical composition of Ti3C2Tx, which will promote the further development of 2D MXenes in energy‐storage applications. 相似文献
20.
综述了近几年锂离子电池正极材料层状三元过渡金属氧化物LiCoxNiyMn1-x-yO2的研究进展,重点讨论了综合性能优异的LiCo1/3Ni1/3Mn1/3O2的电化学性能、结构、制备方法以及存在的不足,LiCo1/3Ni1/3Mn1/3O2与其它商业化正极材料相比具有高容量、热稳定性好、高倍率放电等诸多优异的性能,若能解决循环、存放等问题,将有望成为新一代锂离子电池正极材料。 相似文献