Effect of different binders on electrochemical properties of LiFePO4/C cathode material in lithium ion batteries
Effect of different binders on electrochemical properties of LiFePO4/C cathode material in lithium ion batteries
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不同粘结剂对锂离子电池LiFePO4/C正极材料电化学性能的影响
DOI：
10.1016/j.cej.2013.08.119
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发表时间：
2014-02-01
影响因子：
15.1
通讯作者：
Li, Qingyu
中科院分区：
文献类型：
--
作者：
Hu, Sijiang;Li, Yu;Li, Qingyu
采用固相反应法成功制备了LiFePO 4/C纳米复合材料。采用X射线衍射（XRD）和扫描电子显微镜（SEM）对LiFePO 4/C的晶体结构和形貌进行了表征。结果表明，合成的LiFePO 4/C为单相，具有橄榄石结构，颗粒大小适中。比较了以聚甲基丙烯酸甲酯（PMMA）、聚偏氟乙烯（PVDF）和聚偏氟乙烯-六氟丙烯共聚物（PVDF-HFP）为粘结剂制备的LiFePO 4/C电极的电化学性能。恒电流充放电测试表明，PVDF-HFP粘结剂具有最高的倍率性能和循环性能。研究发现，含有PVDF-HFP粘合剂的LiFePO 4/C电极具有更好的倍率性能和循环稳定性，这是由于更高的无定形度和更低的玻璃化转变温度（Tg）提供了更多的自由移动的Li+离子。皇冠版权所有（C）2013由爱思唯尔B. V.出版保留所有权利。
LiFePO4/C nano-composite has been successfully synthesized by solid-state reaction. The crystal structure and morphology of the LiFePO4/C are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that single-phase LiFePO4/C with olivine structure and suitable particle size was obtained. The electrochemical performance of the LiFePO4/C electrodes with poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVDF) and poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) as binders are compared. Galvanostatic charge-discharge testing shows using PVDF-HFP binder has highest rate capability and cyclic property. The better rate performance and cycling stability of the LiFePO4 /C electrode containing PVDF-HFP binder is found to be due to the more free mobile Li+ ion providing form the higher amorphocity and lower glass transition temperature (Tg). Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.