收稿日期: 2010-04-02
修回日期: 2010-10-25
网络出版日期: 2011-07-15
基金资助
国家自然科学基金(20973124)和教育部博士点基金(20070056138)资助
Preparation and electrochemical properties of Li1+xV3O8-yFy synthesized by solid state reaction method at moderate-heating temperature
Received date: 2010-04-02
Revised date: 2010-10-25
Online published: 2011-07-15
以Li2CO3和V2O5为原料,用中热固相法制备了掺杂不同氟离子含量的锂离子电池正极材料Li1+xV3O8-yFy,采用XRD衍射对其结构进行表征,并通过充放电测试、循环伏安及电导率测试对其性能进行了研究.测试结果表明,中热固相法制得的Li1+xV3O8-yFy产品较纯,没有杂质相存在;当y = 0.1时产品的电化学循环性能最好,首次放电比容量达252.08 mAh/g,以0.2c倍率循环25次之后比容量仍保持在210.93 mAh/g,容量保持率达92.72%.
关键词： Li1+xV3O8-yFy; F-掺杂; 锂离子电池; 正极材料; 中热固相法
秦红莲 , 唐致远 , 马莉 . 中热固相法Li1+x V3 O8-y Fy 正极材料的制备及性能[J]. 中国科学院大学学报, 2011 , 28(4) : 457 -461 . DOI: 10.7523/j.issn.2095-6134.2011.4.005
F--doped lithium vanadium oxides Li1+xV3O8-yFy was synthesized by a solid state reaction at moderate-heating temperature with Li2CO3 and V2O5 as raw materials. Crystal structures were characterized by XRD and electrochemical properties were studied by charge-discharge performance test, cyclic voltammetry test, and conductance test. The XRD results indicate that the products are pure without any impurities. Li1+xV3O8-yFy (y=0.1) shows the best electrochemical cyclability. The first discharge specific capacity is 252.08mAh/g, and the attractive specific capacity of 210.93 mAh/g is obtained after 25 cycles at 0.2c.
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