【作者】 段建国； 曹雁冰； 胡国荣； 彭忠东； 杜柯；

【Author】 DUAN Jian-guo,CAO Yan-bing,HU Guo-rong,PENG Zhong-dong,DU Ke (School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China)

【机构】 中南大学 冶金科学与工程学院；

【摘要】 以LiH₂PO₄和Mn粉为原料,聚乙烯醇为碳源,通过机械化学活化辅助固相法合成了LiMnPO_/C材料。主要考察了合成温度对LiMnPO₄/C材料晶体结构、物理和电化学性能的影响。实验结果表明650℃下热处理的产物结晶良好,得到分布均匀、细小的活性颗粒。在最佳的热处理条件下,热解碳在LiMnPO₄颗粒表面形成了良好的导电层,LiMnPO₄/C材料在0.1C、0.2C、0.5C和1C倍率下放电比容量分别为114.2、109.6、102.7、89.2 mAh/g,保持了0.05C容量的96.2%、92.3%、86.5%和75.2%。更多还原

【Abstract】 Carbon-coated LiMnPO₄ cathode material was prepared by ball-milling activation and subsequent solid state reaction,with LiH₂PO₄ and Mn powder as starting materials,and polyvinyl alcohol（PVA）as carbon source.The effect of synthetic temperature on crystal structure,physical property and electrochemical performance of LiMnPO₄/C composites were studied.The results show that 650℃was the optimal synthetic temperature.Under this temperature,pyrolytic carbon forms an excellent conducting layer on the surface of LiMnPO₄ particles.The discharge capacity of the sample under 0.1C,0.2C,0.5C and 1C rate was 114.2,109.6,102.7 and 89.2 mAh/g.Retained 96.2%,92.3%,86.5%and 75.2% capacity acted under 0.05C respectivelly.更多还原