固相合成锂离子电池正极材料LiMn_(1-x)Fe_xPO_4/C的结构与电化学性能  

Synthesis and electrochemical properties of LiMn_(1-x)Fe_xPO_4/Ccathode materials for Li-ion battery by a facile solid-state method

作　　者：苑硕 唐仁衡[2] 王英[2] 肖志平[2] 卢安贤[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]广东省工业技术研究院(广州有色金属研究院),广州510651

出　　处：《粉末冶金材料科学与工程》2015年第3期414-418,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：广州市应用基础重点项目(12C54041653)

摘　　要：以葡萄糖为碳源,对LiH2PO4、MnCO3、FeC2O4与葡萄糖等反应物进行湿法球磨,随后在750℃温度下煅烧,通过固相反应实现对LiMnPO4的铁离子掺杂和碳包覆改性,得到锂离子电池正极材料LiMn1-xFexPO4/C(x=0、0.05、0.10、0.15、0.20)。利用X射线衍射(XRD),扫描电镜(SEM)及电化学测试等手段研究铁离子掺杂量对磷酸锰锂的晶体结构、微观形貌与电性能的影响。结果表明,LiMn0.9Fe0.1PO4/C结晶度良好,颗粒较均匀细小,具有较好的电化学性能,0.05C倍率下的首次放电比容量达到110(mA·h)/g,经过30次循环后,放电比容量约80(mA·h)/g。LiMn1-xFexPO4/C cathode materials for Li-ion battery were synthesized at 750 ℃ by solid-state reaction method combining with the addition of the glucose as the carbon source and wet ball-milling of reactants. The effects of the doping amount of iron ions on the crystal structure, surface morphology and electrochemical properties of products of LiMn1-xFexPO4/C （x=0, 0.05, 0.10, 0.15, 0.20） were investigated by X-ray diffraction （XRD）, scanning electron microscope （SEM）, electrochemical measurement, respectively. The results indicate that the LiMn0.9Fe0.1PO4/C has the best electrochemical performance, and the initial discharge capacity of the sample reaches approximately 110 （mA.h）/g at 0.05 C, moreover the discharge capacity keeps still to 80 （mA.h）/g after 30 cycles.

关 键 词：锂离子电池 LIMNPO4 FE掺杂 固相合成 

分 类 号：TM912.9[电气工程—电力电子与电力传动]