不同锰源对LiMn_(0.6)Fe_(0.4)PO_(4)正极材料性能的影响研究  

Study on effect of different manganese sources on LiMn_(0.6)Fe_(0.4)PO_(4) cathode material

作　　者：吴松 余欣鑫 张志萍 陈嘉伟 吴永慧 WU Song;YU Xinxin;ZHANG Zhiping;CHEN Jiawei;WU Yonghui(Guizhou Phosphate New Energy Technology Co.,Ltd.,Xifeng 550000,China)

机构地区：[1]贵州磷化新能源科技有限责任公司,贵州息烽550000

出　　处：《生态产业科学与磷氟工程》2024年第10期13-17,共5页Eco-industry Science & Phosphorus Fluorine Engineering

基　　金：贵州优势特色矿产资源高效利用研究(黔科合战略找矿[2022]ZD006)。

摘　　要：通过高温固相法工艺制备电池级磷酸锰铁锂材料,探讨以不同晶型锰化合物为锰源对磷酸锰铁锂正极材料性能的影响,采用X射线衍射仪、高分辨扫描电子显微镜及电化学性能测试对磷酸锰铁锂正极材料进行表征。研究发现,采用碳酸锰为锰源制备的LiMn_(0.6)Fe_(0.4)PO_(4)@C正极材料在0.1 C倍率下放电比容量为155.32 mA·h/g,1 C倍率下循环200次后电池的容量保持率为95.8%,压实密度为2.13 g/cm^(3);采用四氧化三锰为锰源制备的LiMn_(0.6)Fe_(0.4)PO_(4)@C正极材料在0.1 C倍率下放电比容量为164.55 mA·h/g,1 C倍率下循环200次后电池的容量保持率为97.3%,压实密度为2.25 g/cm^(3),具有较好的电性能与压实密度。Lithium manganese iron phosphate is prepared by high temperature solid phase process.The effects of different crystalline manganese compounds as manganese sources on lithium manganese iron phosphate cathode materials are investigated.The material is characterized by X-ray diffraction,high resolution scanning electron microscopy and electrochemical performance test.It is founded that the specific discharge capacity of the LiMn_(0.6)Fe_(0.4)PO_(4)@C cathode material prepared with manganese carbonate as manganese source is 155.3 mA·h/g at 0.1 C magnification,the capacity retention rate of the battery is 95.8%after 200 cycles at 1 C magnification,and the compaction density is 2.13 g/cm~3.Using manganese tetroxide as manganese source,the specific capacity of the LiMn_(0.6)Fe_(0.4)PO_(4)@C cathode material is 164.55 mA·h/g at 0.1 C magnification,the capacity retention rate of the battery is 97.3%after 200 cycles at 1 C magnification,and the compaction density is 2.25 g/cm~3,which is proved to be good electrical performance and compaction density.

关 键 词：锂离子电池 磷酸锰铁锂 磷酸铁 碳酸锰 四氧化三锰 

分 类 号：TM912[电气工程—电力电子与电力传动]