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1.
Formation of Septuple‐Shelled (Co2/3Mn1/3)(Co5/6Mn1/6)2O4 Hollow Spheres as Electrode Material for Alkaline Rechargeable Battery
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Xiaoxian Zhao Ranbo Yu Hongjie Tang Dan Mao Jian Qi Bao Wang Yu Zhang Huijun Zhao Wenping Hu Dan Wang 《Advanced materials (Deerfield Beach, Fla.)》2017,29(34)
The multishelled (Co2/3Mn1/3)(Co5/6Mn1/6)2O4 hollow microspheres with controllable shell numbers up to septuple shells are synthesized using developed sequential templating method. Exhilaratingly, the septuple‐shelled complex metal oxide hollow microsphere is synthesized for the first time by doping Mn into Co3O4, leading to the change of crystalline rate of precursor. Used as electrode materials for alkaline rechargeable battery, it shows a remarkable reversible capacity (236.39 mAh g?1 at a current density of 1 A g?1 by three‐electrode system and 106.85 mAh g?1 at 0.5 A g?1 in alkaline battery) and excellent cycling performance due to its unique structure. 相似文献
2.
Yueqi Kong Ashok Kumar Nanjundan Yang Liu Hao Song Xiaodan Huang Chengzhong Yu 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(51)
Selenium (Se)‐based rechargeable aluminum batteries (RABs), known as aluminum–selenium (Al–Se) batteries, are an appealing new battery design that holds great promise for addressing the low‐capacity problem of current RAB technology. However, their applications are hindered by mediocre high‐rate capacity (≈100 mAh g?1 at 0.5 A g?1) and insufficient cycling life (50 cycles). Herein, the synthesis of mesoporous carbon fibers (MCFs) by coating mesoporous carbon with short‐length mesopores and tunable mesopore sizes (2.7 to 8.9 nm) coaxially on carbon nanotubes (CNT) is reported. When compositing MCFs with Se for Al–Se batteries, a positive correlation between mesopore size and electrolyte ion diffusivity is observed, however when pore size is increased to 8.9 nm, large voids are created at the interface of CNT core and mesoporous carbon shell, leading to decreased electrode conductivity. The trade‐off between ion diffusivity and interfacial connectivity/conductivity determines MCF with pore size of 7.1 nm as the best host material for Al–Se batteries. The composite cathode delivers high specific capacities (366 and 230 mAh g?1 at 0.5 and 1 A g?1), good rate performance, and excellent cycling stability (152 mAh g?1 after 500 cycles at 2 A g?1), superior over previously reported Se cathodes and other cathodes for RABs. 相似文献
3.
Xing Li Hui Wang Zhongxin Chen Hai‐Sen Xu Wei Yu Cuibo Liu Xiaowei Wang Kun Zhang Keyu Xie Kian Ping Loh 《Advanced materials (Deerfield Beach, Fla.)》2019,31(48)
Covalent organic frameworks (COFs) are an emerging class of porous crystalline materials constructed from designer molecular building blocks that are linked and extended periodically via covalent bonds. Their high stability, open channels, and ease of functionalization suggest that they can function as a useful cathode material in reversible lithium batteries. Here, a COF constructed from hydrazone/hydrazide‐containing molecular units, which shows good CO2 sequestration properties, is reported. The COF is hybridized to Ru‐nanoparticle‐coated carbon nanotubes, and the composite is found to function as highly efficient cathode in a Li–CO2 battery. The robust 1D channels in the COF serve as CO2– and lithium‐ion‐diffusion channels and improve the kinetics of electrochemical reactions. The COF‐based Li–CO2 battery exhibits an ultrahigh capacity of 27 348 mAh g?1 at a current density of 200 mA g?1, and a low cut‐off overpotential of 1.24 V within a limiting capacity of 1000 mAh g?1. The rate performance of the battery is improved considerably with the use of the COF at the cathode, where the battery shows a slow decay of discharge voltage from a current density of 0.1 to 4 A g?1. The COF‐based battery runs for 200 cycles when discharged/charged at a high current density of 1 A g?1. 相似文献
4.
Yi Liu Jing Wang Yinxiang Zeng Jie Liu Xiaoqing Liu Xihong Lu 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(11)
Aqueous Zn‐ion batteries (ZIBs) have garnered the researchers' spotlight owing to its high safety, cost effectiveness, and high theoretical capacity of Zn anode. However, the availability of cathode materials for Zn ions storage is limited. With unique layered structure along the [010] direction, α‐MoO3 holds great promise as a cathode material for ZIBs, but its intrinsically poor conductivity severely restricts the capacity and rate capability. To circumvent this issue, an efficient surface engineering strategy is proposed to significantly improve the electric conductivity, Zn ion diffusion rate, and cycling stability of the MoO3 cathode for ZIBs, thus drastically promoting its electrochemical properties. With the synergetic effect of Al2O3 coating and phosphating process, the constructed Zn//P‐MoO3?x@Al2O3 battery delivers impressive capacity of 257.7 mAh g?1 at 1 A g?1 and superior rate capability (57% capacity retention at 20 A g?1), dramatically surpassing the pristine Zn//MoO3 battery (115.8 mAh g?1; 19.7%). More importantly, capitalized on polyvinyl alcohol gel electrolyte, an admirable capacity (19.2 mAh cm?3) as well as favorable energy density (14.4 mWh cm?3; 240 Wh kg?1) are both achieved by the fiber‐shaped quasi‐solid‐state ZIB. This work may be a great motivation for further research on molybdenum or other layered structure materials for high‐performance ZIBs. 相似文献
5.
Qianqian Hu Jiqun Lu Chun Yang Congcong Zhang Jinlong Hu Shiyong Chang Haiyong Dong Chunyu Wu Ye Hong Lingzhi Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(34)
Main obstacles from the shuttle effect and slow conversion rate of soluble polysulfide compromise the sulfur utilization and cycling life for lithium sulfur (Li–S) batteries. In pursuit of a practically viable high performance Li–S battery, a separator configuration (CoS2/HPGC/interlayer) as efficient polysulfide trapping barrier is reported. This configuration endows great advantages, particularly enhanced conductivity, promoted polysulfide trapping capability, accelerated sulfur electrochemistry, when using the functional interlayer for Li–S cells. Attributed to the above merits, such cell shows excellent cyclability, with a capacity of 846 mAh g?1 after 250 cycles corresponding to a high capacity retention of 80.2% at 0.2 C, and 519 mAh g?1 after 500 cycles at 1C (1C = 1675 mA g?1). In addition, the optimized separator exhibits a high initial areal capacity of 4.293 mAh cm?2 at 0.1C. Moreover, with CoS2/HPGC/interlayer, the sulfur cell enables a low self‐discharge rate with a very high capacity retention of 97.1%. This work presents a structural engineering of the separator toward suppressing the dissolution of soluble Li2Sn moieties and simultaneously promoting the sulfur conversion kinetics, thus achieving durable and high capacity Li–S batteries. 相似文献
6.
Jiaojiao Zhu Yongtai Xu Yujun Fu Dewei Xiao Yali Li Lingyang Liu Yue Wang Qingnuan Zhang Junshuai Li Xingbin Yan 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(17)
Dual ion batteries (DIBs) have recently attracted ever‐increasing attention owing to the potential advantages of low material cost and good environmental friendliness. However, the potential safety hazards, cost, and environmental concerns mainly resulted from the commonly used nonaqueous organic solvents severely hinder the practical application of DIBs. Herein, a hybrid aqueous/nonaqueous water‐in‐bisalt electrolyte with both broad electrochemical stability window and excellent safety performance is developed. The lithium‐based DIB assembled using KS6 graphite and niobium pentoxide as the active materials in the cathode and anode exhibits good comprehensive performance including capacity, cycling stability, rate performance, and medium discharge voltage. Initial capacities of ≈47.6 and 29.6 mAh g?1 retention after 300 cycles can be delivered with a medium discharge voltage of around 2.2 V in the voltage window of 0–3.2 V at the current density of 200 mA g?1. Good rate performance for the battery can be indicated by 29.7 mAh g?1 discharge capacity retention at 400 mA g?1. It is noteworthy that the coulombic efficiency of the battery can reach as high as 93.9%, which is comparable to that of the corresponding DIBs using nonaqueous organic electrolytes. 相似文献
7.
Curved Fragmented Graphenic Hierarchical Architectures for Extraordinary Charging Capacities
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Hong‐Yuan Lian Saikat Dutta Satoshi Tominaka Yu‐An Lee Shu‐Yun Huang Yasuhiro Sakamoto Chia‐Hung Hou Wei‐Ren Liu Joel Henzie Yusuke Yamauchi Kevin C.‐W. Wu 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(27)
An approach to assemble hierarchically ordered 3D arrangements of curved graphenic nanofragments for energy storage devices is described. Assembling them into well‐defined interconnected macroporous networks, followed by removal of the template, results in spherical macroporous, mesoporous, and microporous carbon microball (3MCM) architectures with controllable features spanning nanometer to micrometer length scales. These structures are ideal porous electrodes and can serve as lithium‐ion battery (LIB) anodes as well as capacitive deionization (CDI) devices. The LIBs exhibit high reversible capacity (up to 1335 mAh g?1), with great rate capability (248 mAh g?1 at 20 C) and a long cycle life (60 cycles). For CDI, the curved graphenic networks have superior electrosorption capacity (i.e., 5.17 mg g?1 in 0.5 × 10?3m NaCl) over conventional carbon materials. The performance of these materials is attributed to the hierarchical structure of the graphenic electrode, which enables faster ion diffusion and low transport resistance. 相似文献
8.
Nanostructured carbon materials are extensively applied as host materials to improve the utilization rate and reversibility of elemental sulfur in lithium sulfur (Li-S) batteries. Here, S, N-codoped carbon capsules (SNCCs) with microporous walls, prepared by a self-assembly process, are used as the sulfur host material in Li-S batteries. The SNCCs provide plenty of micron-sized cavities to accommodate a high S loading, which are sealed by thick walls with microsized entrance to efficently suppress the shuttle effect of lithium polysulfides. As the cathode in Li-S battery, the SNCCs/sulfur composite with a sulfur mass loading of 70 wt% exhibits a high average reversible capacity of 1220 and 1116 mA h g?1 at 0.5C and 1C, respectively, superior rate performance (905 and 605 mAh g?1 at 5C and 10C, respectively) and excellent cycling stability (capacity fading rate of 0.03% per cycle in 500 cycles). Even at a high sulfur areal loading of 7.3 mg/cm2, the SNCCs/0.7S electrode still deliver a high initial discharge capacity of 838 mAh g?1 and keeps at 730 mAh g?1 after 100 cycles, corresponding to an extraordinary capacity retention of 87.1%, showing an excellent cyclic stability. The outstanding electrochemical performance is associated with the unique capsule structure with abundant volume, microsized entrance and high conductivity. Our results provides a new strategy to prepare highly stable sulfur-carbon composites for the application in Li-S batteries. 相似文献
9.
Chenglin Zhang Yang Xu Kaiming He Yulian Dong Huaping Zhao Lukas Medenbach Yuhan Wu Andrea Balducci Thomas Hannappel Yong Lei 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(38)
Potassium‐ion batteries (PIBs) configurated by organic electrodes have been identified as a promising alternative to lithium‐ion batteries. Here, a porous organic Polyimide@Ketjenblack is demonstrated in PIBs as a cathode, which exhibits excellent performance with a large reversible capacity (143 mAh g?1 at 100 mA g?1), high rate capability (125 and 105 mAh g?1 at 1000 and 5000 mA g?1), and long cycling stability (76% capacity retention at 2000 mA g?1 over 1000 cycles). The domination of fast capacitive‐like reaction kinetics is verified, which benefits from the porous structure synthesized using in situ polymerization. Moreover, a renewable and low‐cost full cell is demonstrated with superior rate behavior (106 mAh g?1 at 3200 mA g?1). This work proposes a strategy to design polymer electrodes for high‐performance organic PIBs. 相似文献
10.
Hongli Wan Liangting Cai Yu Yao Wei Weng Yuezhan Feng Jean Pierre Mwizerwa Gaozhan Liu Yan Yu Xiayin Yao 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(34)
Fe3S4 @ S @ 0.9Na3SbS4?0.1NaI composite cathode is prepared through one‐step wet‐mechanochemical milling procedure. During milling process, ionic conduction pathway is self‐formed in the composite due to the formation of 0.9Na3SbS4?0.1NaI electrolyte without further annealing treatment. Meanwhile, the introduction of Fe3S4 can increase the electronic conductivity of the composite cathode by one order of magnitude and nearly double enhance the ionic conductivities. Besides, the aggregation of sulfur is effectively suppressed in the obtained Fe3S4 @ S @ 0.9Na3SbS4?0.1NaI composite, which will enhance the contact between sulfur and 0.9Na3SbS4?0.1NaI electrolyte, leading to a decreased interfacial resistance and improving the electrochemical kinetics of sulfur. Therefore, the resultant all‐solid‐state sodium–sulfur battery employing Fe3S4 @ S @ 0.9Na3SbS4?0.1NaI composite cathode shows discharge capacity of 808.7 mAh g?1 based on Fe3S4@S and a normalized discharge capacity of 1040.5 mAh g?1 for element S at 100 mA g?1 for 30 cycles at room temperature. Moreover, the battery also exhibits excellent cycling stability with a reversible capacity of 410 mAh g?1 at 500 mA g?1 for 50 cycles, and superior rate capability with capacities of 952.4, 796.7, 513.7, and 445.6 mAh g?1 at 50, 100, 200, and 500 mA g?1, respectively. This facile strategy for sulfur‐based composite cathode is attractive for achieving room‐temperature sodium–sulfur batteries with superior electrochemical performance. 相似文献
11.
Interlayer‐Spacing‐Regulated VOPO4 Nanosheets with Fast Kinetics for High‐Capacity and Durable Rechargeable Magnesium Batteries
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Limin Zhou Qi Liu Zihe Zhang Kai Zhang Fangyu Xiong Shuangshuang Tan Qinyou An Yong‐Mook Kang Zhen Zhou Liqiang Mai 《Advanced materials (Deerfield Beach, Fla.)》2018,30(32)
Owing to the low‐cost, safety, dendrite‐free formation, and two‐electron redox properties of magnesium (Mg), rechargeable Mg batteries are considered as promising next‐generation secondary batteries with high specific capacity and energy density. However, the clumsy Mg2+ with high polarity inclines to sluggish Mg insertion/deinsertion, leading to inadequate reversible capacity and rate performance. Herein, 2D VOPO4 nanosheets with expanded interlayer spacing (1.42 nm) are prepared and applied in rechargeable magnesium batteries for the first time. The interlayer expansion provides enough diffusion space for fast kinetics of MgCl+ ion flux with low polarization. Benefiting from the structural configuration, the Mg battery exhibits a remarkable reversible capacity of 310 mAh g?1 at 50 mA g?1, excellent rate capability, and good cycling stability (192 mAh g?1 at 100 mA g?1 even after 500 cycles). In addition, density functional theory (DFT) computations are conducted to understand the electrode behavior with decreased MgCl+ migration energy barrier compared with Mg2+. This approach, based on the regulation of interlayer distance to control cation insertion, represents a promising guideline for electrode material design on the development of advanced secondary multivalent‐ion batteries. 相似文献
12.
3D Interconnected and Multiwalled Carbon@MoS2@Carbon Hollow Nanocables as Outstanding Anodes for Na‐Ion Batteries
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Yan Wang Qunting Qu Guangchao Li Tian Gao Feng Qian Jie Shao Weijie Liu Qiang Shi Honghe Zheng 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(43):6033-6041
Currently, the specific capacity and cycling performance of various MoS2/carbon‐based anode materials for Na‐ion storage are far from satisfactory due to the insufficient structural stability of the electrode, incomplete protection of MoS2 by carbon, difficult access of electrolyte to the electrode interior, as well as inactivity of the adopted carbon matrix. To address these issues, this work presents the rational design and synthesis of 3D interconnected and hollow nanocables composed of multiwalled carbon@MoS2@carbon. In this architecture, (i) the 3D nanoweb‐like structure brings about excellent mechanical property of the electrode, (ii) the ultrathin MoS2 nanosheets are sandwiched between and doubly protected by two layers of porous carbon, (iii) the hollow structure of the primary nanofibers facilitates the access of electrolyte to the electrode interior, (iv) the porous and nitrogen‐doping properties of the two carbon materials lead to synergistic Na‐storage of carbon and MoS2. As a result, this hybrid material as the anode material of Na‐ion battery exhibits fast charge‐transfer reaction, high utilization efficiency, and ultrastability. Outstanding reversible capacity (1045 mAh g?1), excellent rate behavior (817 mAh g?1 at 7000 mA g?1), and good cycling performance (747 mAh g?1 after 200 cycles at 700 mA g?1) are obtained. 相似文献
13.
Yilin Shan Yanyan He Na Yang Xiang Zhu Honglai Liu Hao Jiang Chunzhong Li 《Small (Weinheim an der Bergstrasse, Germany)》2022,18(1):2105927
The development of novel redox-active polymers for sustainable sodium ion batteries (SIBs) has captured growing attention, but battery performance has been significantly limited by poor reversible specific capacities, where the majority of aromatic C6-benzene linkages are redox inactive. Here, a simple, yet efficient approach to improve sodium (Na) storage on these C6-benzene rings within a porous polymeric framework by rationally regulating their steric hindrance is reported. Decreasing intrinsic hindrance affords a significant improvement in redox reaction kinetics within the porous architecture, thereby facilitating the acceptance of Na ions on these functionalized benzene rings and boosting the SIB performance. As a result, the modulate porous framework exhibits an exceptional battery capacity of 376 mAh g?1 after 1000 cycles at 1.0 A g?1, which is ≈1.5 times larger than that of the pristine framework. Furthermore, the performance can reach as high as 510 mAh g?1 at 0.1 A g?1, comparable to that of the best-performing polymeric electrodes. The simple modulation approach not only enables Na storage modulation on functionalized C6-benzene rings, but also simultaneously provides a means to extend the understanding of the structure-property relationship and facilitate new possibilities for organic SIBs. 相似文献
14.
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
15.
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
16.
Wei Wang Isaac Ruiz Kazi Ahmed Hamed Hosseini Bay Aaron S. George Johnny Wang John Butler Mihrimah Ozkan Cengiz S. Ozkan 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(16):3389-3396
In this work, we report the synthesis of an three‐dimensional (3D) cone‐shape CNT clusters (CCC) via chemical vapor deposition (CVD) with subsequent inductively coupled plasma (ICP) treatment. An innovative silicon decorated cone‐shape CNT clusters (SCCC) is prepared by simply depositing amorphous silicon onto CCC via magnetron sputtering. The seamless connection between silicon decorated CNT cones and graphene facilitates the charge transfer in the system and suggests a binder‐free technique of preparing lithium ion battery (LIB) anodes. Lithium ion batteries based on this novel 3D SCCC architecture demonstrates high reversible capacity of 1954 mAh g?1 and excellent cycling stability (>1200 mAh g?1 capacity with ≈100% coulombic efficiency after 230 cycles). 相似文献
17.
Oxygen‐Vacancy and Surface Modulation of Ultrathin Nickel Cobaltite Nanosheets as a High‐Energy Cathode for Advanced Zn‐Ion Batteries
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Yinxiang Zeng Zhengzhe Lai Yi Han Haozhe Zhang Shilei Xie Xihong Lu 《Advanced materials (Deerfield Beach, Fla.)》2018,30(33)
The development of high‐capacity, Earth‐abundant, and stable cathode materials for robust aqueous Zn‐ion batteries is an ongoing challenge. Herein, ultrathin nickel cobaltite (NiCo2O4) nanosheets with enriched oxygen vacancies and surface phosphate ions (P–NiCo2O4‐x) are reported as a new high‐energy‐density cathode material for rechargeable Zn‐ion batteries. The oxygen‐vacancy and surface phosphate‐ion modulation are achieved by annealing the pristine NiCo2O4 nanosheets using a simple phosphating process. Benefiting from the merits of substantially improved electrical conductivity and increased concentration of active sites, the optimized P–NiCo2O4‐x nanosheet electrode delivers remarkable capacity (309.2 mAh g?1 at 6.0 A g?1) and extraordinary rate performance (64% capacity retention at 60.4 A g?1). Moreover, based on the P–NiCo2O4‐x cathode, our fabricated P–NiCo2O4‐x//Zn battery presents an impressive specific capacity of 361.3 mAh g?1 at the high current density of 3.0 A g?1 in an alkaline electrolyte. Furthermore, extremely high energy density (616.5 Wh kg?1) and power density (30.2 kW kg?1) are also achieved, which outperforms most of the previously reported aqueous Zn‐ion batteries. This ultrafast and high‐energy aqueous Zn‐ion battery is promising for widespread application to electric vehicles and intelligent devices. 相似文献
18.
Porous Carbon Nanofibers Encapsulated with Peapod‐Like Hematite Nanoparticles for High‐Rate and Long‐Life Battery Anodes
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Fe2O3 is regarded as a promising anode material for lithium‐ion batteries (LIBs) and sodium‐ion batteries (SIBs) due to its high specific capacity. The large volume change during discharge and charge processes, however, induces significant cracking of the Fe2O3 anodes, leading to rapid fading of the capacity. Herein, a novel peapod‐like nanostructured material, consisting of Fe2O3 nanoparticles homogeneously encapsulated in the hollow interior of N‐doped porous carbon nanofibers, as a high‐performance anode material is reported. The distinctive structure not only provides enough voids to accommodate the volume expansion of the pea‐like Fe2O3 nanoparticles but also offers a continuous conducting framework for electron transport and accessible nanoporous channels for fast diffusion and transport of Li/Na‐ions. As a consequence, this peapod‐like structure exhibits a stable discharge capacity of 1434 mAh g?1 (at 100 mA g?1) and 806 mAh g?1 (at 200 mA g?1) over 100 cycles as anode materials for LIBs and SIBs, respectively. More importantly, a stable capacity of 958 mAh g?1 after 1000 cycles and 396 mAh g?1 after 1500 cycles can be achieved for LIBs and SIBs, respectively, at a large current density of 2000 mA g?1. This study provides a promising strategy for developing long‐cycle‐life LIBs and SIBs. 相似文献
19.
Etching‐Assisted Crumpled Graphene Wrapped Spiky Iron Oxide Particles for High‐Performance Li‐Ion Hybrid Supercapacitor
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Eunji Kim Hyeri Kim Byung‐Jun Park Young‐Hee Han Jong Hyuk Park Jinhan Cho Sang‐Soo Lee Jeong Gon Son 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(16)
From graphene oxide wrapped iron oxide particles with etching/reduction process, high‐performance anode and cathode materials of lithium‐ion hybrid supercapacitors are obtained in the same process with different etching conditions, which consist of partially etched crumpled graphene (CG) wrapped spiky iron oxide particles (CG@SF) for a battery‐type anode, and fully etched CG for a capacitive‐type cathode. The CG is formed along the shape of spikily etched particles, resulting in high specific surface area and electrical conductivity, thus the CG‐based cathode exhibits remarkable capacitive performance of 210 F g?1 and excellent rate capabilities. The CG@SF can also be ideal anode materials owing to spiky and porous morphology of the particles and tightly attached crumpled graphene onto the spiky particles, which provides structural stability and low contact resistance during repetitive lithiation/delithiation processes. The CG@SF anode shows a particularly high capacitive performance of 1420 mAh g?1 after 270 cycles, continuously increases capacity beyond the 270th cycle, and also maintains a high capacity of 170 mAh g?1 at extremely high speeds of 100 C. The full‐cell exhibits a higher energy density up to 121 Wh kg?1 and maintains high energy density of 60.1 Wh kg?1 at 18.0 kW kg?1. This system could thus be a practical energy storage system to fill the gap between batteries and supercapacitors. 相似文献
20.
Novel 2D Layered Molybdenum Ditelluride Encapsulated in Few‐Layer Graphene as High‐Performance Anode for Lithium‐Ion Batteries
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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