Improved electrochemical performance of LiFe0.65Mn0.35PO4cathode material by using electrolytic manganese dioxide for lithium-ion battery  

作　　者：ZHOU HuangKai LU JinHua HUANG XiaoPeng DU YuanChao LIANG Feng YAO YaoChun 

机构地区：[1]Faculty of Metallurgical and Energy Engineering, National Engineering Laboratory for Vacuum Metallurgy, Kunming 650093, China [2]Laboratory for Advanced Batteries and Materials of Yunnan Province, Kunming University of Scienee and Technology, Kunming 650093, China [3]National Key Laboratory for Clean Application of Complex Non-ferrous Metal Resources, Kunming University Science and Technology, Kunming 650500, China

出　　处：《Science China(Technological Sciences)》2017年第12期1853-1860,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51364021);the Natural Science Foundation of Yunnan Province(Grant No.2014FA025);Innovative Research Team in University of Ministry of Education of China(Grant No.IRT1250);Academician Free Exploration Project of Yunnan Province(Grant No.14051600)

摘　　要：The olivine-type structure LiFe_(0.65)Mn_(0.35)PO_4 materials are respectively synthesized via MnO_2 and MnC_2 O_4·2 H_2 O as manganese resources by using solid-state reaction. The compound materials are characterized by scanning electron microscopies(SEM),transmission electron microscopy(TEM), X-ray photoelectronspectroscopy(XPS) and electrochemical test. The experimental results demonstrate that LiFe_(0.65)Mn_(0.35)PO_4 prepared by MnO_2 as manganese resource exhibits uniform particles with porous structure in SEM and TEM images. XPS data show the coexistence of Mn^(4+), Mn^(3+) and Mn^(2+) cations. Besides, this sample shows better discharge special capacity of 107.46 mA h g^(-1) at 5 C and capacitance conservation rate about 95.47% after 100 cycles at1 C. The superior electrochemical capability is attributed to the coexistence of mixed-valence manganese cations in crystal and the uniform particles with porous structure.The olivine-type structure LiFe（0.65）Mn（0.35）PO4 materials are respectively synthesized via MnO2 and MnC2 O4·2 H2 O as manganese resources by using solid-state reaction. The compound materials are characterized by scanning electron microscopies（SEM）,transmission electron microscopy（TEM）, X-ray photoelectronspectroscopy（XPS） and electrochemical test. The experimental results demonstrate that LiFe（0.65）Mn（0.35）PO4 prepared by MnO2 as manganese resource exhibits uniform particles with porous structure in SEM and TEM images. XPS data show the coexistence of Mn^4＋, Mn^3＋ and Mn^2＋ cations. Besides, this sample shows better discharge special capacity of 107.46 mA h g^-1 at 5 C and capacitance conservation rate about 95.47% after 100 cycles at1 C. The superior electrochemical capability is attributed to the coexistence of mixed-valence manganese cations in crystal and the uniform particles with porous structure.

关 键 词：solid state reaction electrical properties LiFexMn1-xPO4 lithium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]