PVA辅助两步碳热还原法合成LiFePO_4/C复合材料  

Synthesize of LiFePO_4/C Composites Using PVA Assisted Two-step Carbothermal Reduction Method

作　　者：尹艳红[1,2] 张会双[1,2] 李向南[1,2] 马志华[1,2] 杨书廷[1,2] 

机构地区：[1]河南师范大学化学与环境科学学院,河南新乡453007 [2]河南省动力电源及关键材料工程技术研究中心,河南新乡453007

出　　处：《河南师范大学学报（自然科学版）》2012年第2期86-90,共5页Journal of Henan Normal University(Natural Science Edition)

基　　金：河南省重点科技攻关(102102210183);河南省基础与前沿技术研究计划项目(102300410256);新乡市科技重大项目

摘　　要：以Fe3+为铁源,葡萄糖和有机物聚乙烯醇PVA共同为碳源两步碳热还原法合成LiFePO4/C材料.采用XRD,SEM,LAND电池测试系统及电化学工作站等对材料的晶体结构、形貌和电化学性能进行了研究,并对PVA不同时间加入对材料性能的影响做了分析.结果表明:PVA在原料预烧之后加入,所得LiFePO4/C复合材料具有丰富的表面结构,有较小的交流阻抗和很好的充放电性能,0.1C下初始放电比容量达到了167mAh.g-1,且不同倍率下循环性能稳定.With Fe^3＋ as Ferrum source, glucose and polyvinyl alcohol （PVA） as carbon sources, LiFePO4/C was synthesized by a novel two-step carbothermal reduction method. The crystalline structure, morphology and electrochemical performance of the samples were investigated by X-ray diffraction, SEM, Land testing system and electrochemical workstation. The adding sequence of PVA was investigated. Results show that the synthesized material with PVA added after pre-sintering has rich surface morphology, smaller AC impedance and good electrochemical performances. The initial discharge specific ca- pacity is 167 mAh · g^-1 at 0.1 C current density. And the cycling performances at different current rate are stable.

关 键 词：LIFEPO4/C 葡萄糖 聚乙烯醇 碳热还原 

分 类 号：TM912[电气工程—电力电子与电力传动]