Ran Yan, Hong Ping, Ren Jie, Wang Bingsen, Xiao Mingjing, Chen Yunhua, Xiao Xuechun, Wang Yude
School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China.
Department of Physics, Yunnan University, Kunming 650091, People's Republic of China.
Nanotechnology. 2021 Dec 22;33(11). doi: 10.1088/1361-6528/ac3fe1.
Aqueous zinc-ion batteries (ZIBs) is a potential energy storage system due to its advantages of low cost, good safety, and high theoretical capacity (820 mAh g). However, the lack of cathode materials with long cycle stability severely restricts the development of ZIBs. In this paper, VO/ NaVOnanocomposites are synthesized by molten salt method in one step and used as cathode material for ZIBs, which have good electrochemical performances. The specific capacity of the materials remain 160 mAh gwhen the current density is 0.5 A gafter 1000 cycles, and the capacity retention rate is 102.03% when the current density is 5 A gfor 1000 cycles. This is mainly due to the large number of active sites generated by crystal defects and the synergistic interaction between the dual-phase materials, which reduces the stress of ions inserted/extracted during the Znstorage process and improves the electrochemical performance.
水系锌离子电池（ZIBs）因其成本低、安全性好和理论容量高（820 mAh g）等优点，是一种具有潜力的储能系统。然而，缺乏具有长循环稳定性的阴极材料严重限制了水系锌离子电池的发展。本文采用熔盐法一步合成了VO/NaVO纳米复合材料，并将其用作水系锌离子电池的阴极材料，该材料具有良好的电化学性能。当电流密度为0.5 A g时，经过1000次循环后材料的比容量保持在160 mAh g，当电流密度为5 A g进行1000次循环时，容量保持率为102.03%。这主要是由于晶体缺陷产生了大量活性位点以及双相材料之间的协同相互作用，降低了锌存储过程中离子嵌入/脱出的应力，提高了电化学性能。
