Synthesis and performance of fluorine substituted Li1.05(Ni0.5Mn0.5)0.95O2-xFx cathode materials modified by surface coating with FePO4

被引：22
作者：
Zhang, Hailang [1 ]
Song, Tengfei [1 ]
机构：
[1] Jiangnan Univ, Sch Chem & Mat Engn, Wuxi City 214122, Jiangsu, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2013年 / 114卷
关键词：
Li-ion battery; Cathode material; Fluorine substitution; FePO4; coating; Rate capability; ENHANCED ELECTROCHEMICAL PERFORMANCE; EMULSION DRYING METHOD; CYCLING PERFORMANCE; HIGH-CAPACITY; HIGH-POWER; LI; IMPROVEMENT; CO; LINI1/3CO1/3MN1/3O2; ELECTRODES;
D O I：
10.1016/j.electacta.2013.10.030
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The F-doped layered cathode materials Li-1.05(Ni0.5Mn0.5)(0.95)O2-xFx(0 <= x <= 0.1) with ball-like shape were successfully synthesized by carbonate co-precipitation method, followed by a high temperature calcination process. The effects of fluorine content on the crystal structure, morphology and electrochemical performance were extensively investigated. The XRD results reveal that all the materials synthesized have typical hexagonal structure without impurity. Fluorine-doped materials could have improved cycling performance compared with Li-1.05(Ni0.5Mn0.5)(0.95)O-2, and Li-1.05(Ni0.5Mn0.5)(0.95)O1.95F0.05 shows the best electrochemical property. In addition, 3 wt% FePO4-coated Li-1.05(Ni0.5Mn0.5)(0.95)O1.95F0.05 has significantly improved rate capability and better thermal stability compared with pristine sample. Electrochemical impedance spectroscopy (EIS) measurements reveal that both fluorine substitution and FePO4 coating could suppress the increase of charge transfer resistance with cycling. Overall, the combination of fluorine doping and FePO4 coating was effective in improving both cycling performance and rate capability of Li-1.05(Ni0.5Mn0.5)(0.95)O-2. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：116 / 124
页数：9
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