摘要
本文采用溶胶凝胶法合成了β-LiVOPO4锂离子电池正极材料,研究了其结构和电化学性能。结果表明,在500℃较低温度下能够合成晶态纯相β-LiVOPO4,其结构为正交晶系,属于Pnma空间群。这种材料具有非常稳定的电化学充放电长循环性能。在10 mA/g充放电电流密度下循环300次,其放电比容量没有衰减,维持在150 mAh/g以上。即使在100 mA/g的电流密度下循环1000次,其比容量保持率仍旧高达100%。本文研究结果显示,LiVOPO4适合用作高能量长循环寿命锂离子电池正极材料。
LiVOPO4 cathode material was synthesized by sol-gel method in this study.The structures and electrochemical properties of the synthesized materials were studied.Present results indicated that pureβ-LiVOPO4 phase crystallized in an orthorhombic Pnma space group after the precursor gel was calcined at a low temperature of 500℃.Micrometer-sized LiVOPO4 material exhibited a superior long-term cyclability during charge-discharge processes.After cycling 300 times at a current dencity of 10 mA/g,the discharge capacity did not decay,retaining a reversible capacity of over 150 mAh/g after 300 cycles.Particularly,the material also retained excellent capacity(100%)upon 1000 cycles at a current dencity of 100 mA/g.The present results show that the LiVOPO4 could be used as efficient cathode materials for high energy and long-life lithium ion battery.
作者
周小荣
李东林
张巍
李童心
孔祥泽
王子匀
贺欣
ZHOU Xiaorong;LI Donglin;ZHANG Wei;LI Tongxin;KONG Xiangze;WANG Ziyun;HE Xin(Energy Materials and Devices Laboratory,School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第5期5143-5147,5174,共6页
Journal of Functional Materials
基金
国家科学自然基金资助项目(21473014)。
