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Rechargeable magnesium batteries (RMBs) attract research interest owing to the low cost and high reliability, but the design of cathode materials is the major difficulty of their development. The bivalent magnesium cation suffers from a strong interaction with the anion and is difficult to intercalate into traditional magnesium intercalation cathodes. Herein, an amorphous molybdenum polysulfide (a-MoSx) is synthesized via a simple one-step solvothermal reaction and used as the cathode material for RMBs. The a-MoSx cathode provides a high capacity (185 mAh g−1) and a good rate performance (50 mAh g−1 at 1000 mA g−1), which are much superior compared with crystalline MoS2 and demonstrate the privilege of amorphous RMB cathodes. A mechanism study demonstrates both of molybdenum and sulfur undergo redox reactions and contribute to the capacity. Further optimizations indicate low-temperature synthesis would favor the magnesium storage performance of a-MoSx. 相似文献
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Wontae Lee Shoaib Muhammad Chernov Sergey Hayeon Lee Jaesang Yoon Yong‐Mook Kang Won‐Sub Yoon 《Angewandte Chemie (International ed. in English)》2020,59(7):2578-2605
The accelerating development of technologies requires a significant energy consumption, and consequently the demand for advanced energy storage devices is increasing at a high rate. In the last two decades, lithium‐ion batteries have been the most robust technology, supplying high energy and power density. Improving cathode materials is one of the ways to satisfy the need for even better batteries. Therefore developing new types of positive electrode materials by increasing cell voltage and capacity with stability is the best way towards the next‐generation Li rechargeable batteries. To achieve this goal, understanding the principles of the materials and recognizing the problems confronting the state‐of‐the‐art cathode materials are essential prerequisites. This Review presents various high‐energy cathode materials which can be used to build next‐generation lithium‐ion batteries. It includes nickel and lithium‐rich layered oxide materials, high voltage spinel oxides, polyanion, cation disordered rock‐salt oxides and conversion materials. Particular emphasis is given to the general reaction and degradation mechanisms during the operation as well as the main challenges and strategies to overcome the drawbacks of these materials. 相似文献
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Dr. Lian Shen Prof. Zhaoxiang Wang Prof. Liquan Chen 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(39):12559-12562
Prussian blues (or iron cyanides) and their analogues are attractive in both fundamental studies and industrial applications owing to their chemical and structural diversity. The large open space in their framework provides tunnels and space for the transport and storage of lithium ions. Two Prussian blues were synthesized by a co‐precipitation method. The nanosized Fe4[Fe(CN)6]3 and cubic FeFe(CN)6 deliver reversible capacities of 95 mAh g?1 and 138 mAh g?1, respectively. In comparison, FeFe(CN)6 shows cycling and rate performances superior to Fe4[Fe(CN)6]3. 相似文献
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聚阴离子型锂离子电池正极材料研究进展 总被引:18,自引:0,他引:18
综述了各种聚阴离子型锂离子电池正极材料的研究现状,重点对各种材料的结构和性能的关系,尤其是聚阴离子在正极材料中的作用,以及改善材料电导率的各种方法及其机理进行了总结和探讨. 相似文献
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Cathode material LiVPO4Cl for lithium-ion rechargeable batteries was synthesized by one-step hydro-thermal method. The result of XRD measurement shows that LiVPO4Cl material has a triclinic crystal structure, P1 space group; the results of SEM and TEM indicate that the sample is mostly single-crystalline, stick-like material; and the results of charge/discharge testing and cyclic voltammetry measurement demonstrate that the charging plateau of LiVPO4Cl material maintains at 4.02 V and the discharging plateau at 3.86 V. After sufficient activation, the discharge capacity at 0.1C rate of the fortieth cycle of LiVPO4Cl material with relatively higher content of carbon reaches 101 mAh·g-1. 相似文献
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Ping Gao Dr. M. Anji Reddy Dr. Xiaoke Mu Dr. Thomas Diemant Le Zhang Dr. Zhirong Zhao‐Karger Dr. Venkata Sai Kiran Chakravadhanula Dr. Oliver Clemens Prof. Dr. R. Jürgen Behm Prof. Dr. Maximilian Fichtner 《Angewandte Chemie (International ed. in English)》2016,55(13):4285-4290
A novel room temperature rechargeable battery with VOCl cathode, lithium anode, and chloride ion transporting liquid electrolyte is described. The cell is based on the reversible transfer of chloride ions between the two electrodes. The VOCl cathode delivered an initial discharge capacity of 189 mAh g?1. A reversible capacity of 113 mAh g?1 was retained even after 100 cycles when cycled at a high current density of 522 mA g?1. Such high cycling stability was achieved in chloride ion batteries for the first time, demonstrating the practicality of the system beyond a proof of concept model. The electrochemical reaction mechanism of the VOCl electrode in the chloride ion cell was investigated in detail by ex situ X‐ray diffraction (XRD), infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS). The results confirm reversible deintercalation–intercalation of chloride ions in the VOCl electrode. 相似文献
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采用模板导向法和高温固相法制备尖晶石型八面体结构的LiMn2O4锂离子电池正极材料,研究了该材料的结构和电化学性能。 电化学性能研究表明,该电极材料具有良好的循环稳定性和倍率性能,在2.5~4.5 V电压范围,电流密度为100 mA/g时,首周充放电比容量分别为147和179 mA·h/g,循环50周后,其充放电比容量仍分别保持在180/181 mA·h/g。 优良的电化学性能可能归因于尖晶石LiMn2O4的形貌结构特征,该方法为制备锂离子电池正极材料提供了思路和依据。 相似文献
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