储能科学与技术2025，Vol.14Issue(12)：4412-4420,9.DOI:10.19799/j.cnki.2095-4239.2025.0582
Ce掺杂对抑制LiFe0.6Mn0.4PO4/C正极材料中Mn金属溶解的作用
Role of Ce doping in suppressing metal dissolution in LiFe0.6Mn0.4PO4/C cathodes
摘要
Abstract
LiFexMn1-xPO4(LFMP)is emerging as a safe and cost-effective cathode material for lithium-ion batteries,combining the excellent cycling stability of LiFePO4 with the high energy density of LiMnPO4.However,severe lattice stress and Jahn-Teller distortion from Mn3+during charging reduce lithium-ion diffusion and electrical conductivity,limiting its industrial application.To address these challenges,Ce-doped LiFe0.6Mn0.4PO4/C(LFMP/C-Ce)was synthesized via ball milling-assisted solid-state sintering,and the effect of varying Ce doping levels on electrochemical performance was investigated.X-ray diffraction,scanning electron microscopy,and transmission electron microscopy were employed to characterize the material composition,surface morphology,and microstructure.The analyses confirmed successful incorporation of Ce ions into the olivine lattice,which alleviated lattice stress by elongating Li—O bonds and shortening Mn—O bonds,thereby mitigating Jahn-Teller distortion.Electrochemical performance was evaluated using constant current-constant voltage charge-discharge testing,galvanostatic intermittent titration technique,cyclic voltammetry,and electrochemical impedance spectroscopy.The results indicated that 1%Ce doping(LFMP/C-Ce1%)delivered the best cycling performance,retaining 92.6%of its capacity after 500 cycles at 1 C.Inductively coupled plasma optical emission spectrometry confirmed that this doping level effectively suppresses Mn dissolution during cycling,thereby enhancing the electrochemical stability and performance of the LFMP cathode.关键词
锂离子电池/磷酸锰铁锂/过渡金属溶解/阳离子掺杂Key words
lithium-ion battery/lithium iron manganese phosphate/transition metal dissolution/cation doping分类
信息技术与安全科学引用本文复制引用
ZHAO Wanwei,YANG Yadong,JIN Guangyao,LIANG Wenyu,LI Jianqiang,XU Rui..Ce掺杂对抑制LiFe0.6Mn0.4PO4/C正极材料中Mn金属溶解的作用[J].储能科学与技术,2025,14(12):4412-4420,9.基金项目
中央高校基本科研业务费(FRF-TP-24-001A). （FRF-TP-24-001A）
