【摘要】 分别采用LiOH·H2O,NH₄VO₃,HNO₃,C₂H₅OH作为原料在没有PVP和有PVP存在下合成了棒状和棒束状两种相貌的γ-LiV₂O₅.棒状γ-LiV₂O₅材料中棒的直径为500⁸00 nm,而棒束状的γ-LiV₂O₅材料则是直径为100⁶00 nm的棒组成的,形貌比较均匀.同时研究了此体系中γ-LiV₂O₅的合成机制.将合成的材料进行电化学测试,棒束状的γ-LiV₂O₅的电化学性能更好,在电流密度为30 mA/g时的初始放电比容量为269.3 mAh/g,循环20次之后容量仍保持在228 mAh/g.更多还原

【Abstract】 The rod-like and bundle-like γ-LiV₂O₅ were synthesized via a simple solvothermal processing.The rod-like γ-LiV₂O₅ with diameter of 500—800 nm and the bundle-like architectures are composed of several of order-attached rods with diameter of 100—600 nm.γ-LiV₂O₅were synthesized using LiOH-H₂O,NH₄VO₃,HNO₃,C₂H₅OH without and with PVP as raw materials.At the same time,the actual formation mechanism of γ-LiV₂O₅ was also investigated.As the cathode materials for lithium ion batteries,the bundle-like 7-LiV₂O₅prepared with PVP delivers a better electrochemical performance,which has an initial discharge capacity of 269.3 mAh/g at a current density of 30 mA/g and is still able to achieve228 mAh/g after the 20th cycle.The good electrochemical properties of the as-synthesizedγ-LiV₂O₅ coupled with the simple,relatively low temperature,and low cost of the preparation method may make this material a promising candidate as a cathode material for lithium ion batteries.更多还原