摘要
锂离子电池具有工作电压高、能量密度大等优点。目前,主流的正极材料如LiFePO_(4)等存在理论容量低等问题,难以满足需求。V_(2)O_(5)具有层状结构,能够有效嵌锂,是一类新型的锂离子电池正极材料。但V_(2)O_(5)作为锂离子电池正极材料时循环稳定性较差,限制了其应用。采用水热法制备二维结构的V_(2)O_(5)纳米片材料,将其作为锂离子电池的正极材料,并与商业V_(2)O_(5)进行对比。测试表明,V_(2)O_(5)纳米片呈现片层状结构,粒径大小在130~280 nm,在循环伏安测试中有三对比较明显的氧化还原峰,经50次循环后V_(2)O_(5)纳米片可逆容量达到227 mAh/g,与第二圈的放电容量相比,容量保持率为89%,证明V_(2)O_(5)纳米片的储锂性能良好。
Lithium-ion batteries have high working voltage and high energy density.At present,mainstream cathode materials such as LiFePO_(3) cannot meet the need due to its low theoretical capacity.V_(2)O_(5) has a layered structure and can be effectively embedded with lithium. It is a new type of positive electrode for lithium-ion batteries.However,the poor cycle stability of V_(2)O_(5) as a cathode material for lithium-ion batteries limits its application.V_(2)O_(5)nanomaterials with two-dimensional structure were prepared by hydrothermal method and used as cathode materials for lithium-ion batteries,and compared with commercial V_(2)O_(5).The results of a series of electrochemical tests show that lamellar structure of V;O;is nanosheets with particle size of 130—280 nm;V_(2)O_(5) nano sheet has three obvious redox peaks,which shows the process of three phase state transition of lithium ion embedded in V_(2)O_(5) nano sheet The cyclic stability test results show that after 50 cycles,reversible capacity of V_(2)O_(5) nano sheet can still reach227 mAh/g.Compared with discharge capacity of the second cycle,capacity retention rate is 89%,which proves that V_(2)O_(5) nano chip has better lithium storage performance.
作者
李基铭
覃慧
刘嘉铭
LI Ji-ming;QIN Hui;LIU Jia-ming(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2021年第11期79-84,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
江西省大学生创新创业训练计划项目(S202010407012)。
关键词
锂离子电池
V
O
正极材料
纳米片
电化学性能
lithium-ion battery
V2O5 cathode material
nanosheet
electrochemical performance
