Mn-doped LiFePO_(4)@C as a high-performance cathode material for lithium-ion batteries  

作　　者：Wenjing Chen Fangxiang Song Yumei Yang Qianlin Chen 

机构地区：[1]School of Chemistry and Chemical Engineering,Guizhou University,Guiyang,550025,China [2]Collaborative Innovation Center of Guizhou Province for Efficient Utilization of Phosphorus and Fluorine Resources,Guizhou University,Guiyang,550025,China

出　　处：《Particuology》2024年第7期418-428,共11页颗粒学报（英文版）

基　　金：the Natural Science Research Project of the Education Department of Guizhou Province(grant No.QJ[2022]001).

摘　　要：In this work,LiFe_(1-x)MnxPO_(4)@C(x=0,0.01,0.02,0.03)cathode materials were obtained by a simple co-precipitation method and heat treatment,and the influence of Mn-doped modification on the electrochemical performance of LiFePO_(4)@C cathode materials was investigated.Results show that by doping an appropriate amount of Mn,the cell volume became larger,and the electronic conductivity increased,which improved the Li+diffusion rate and thus its rate capability and cycle performance of Li-ion batteries.Among them,LiFe_(0.98)Mn_(0.02)PO_(4)@C showed superior lithium storage capability;the discharge capacity can reach 150.7 mAh g^(−1)at 0.1 C.The cell could discharge up to 155.9 mAh g^(−1)at 1 C under high temperature at 45°C,which was higher than LiFePO_(4)@C(142 mAh g^(−1))under the same test conditions.The discharge capacity of 1 C at room temperature was 139.9 mAh g^(−1),and the cycle stability was 95.9%after 200 cycles.It showed that it had good rate capability and excellent cycle performance.These results indicate that Mn-doped LFP is a simple and effective strategy for developing high-performance cathode materials.

关 键 词：MN-DOPED LiFePO_(4) Lithium-ion battery High temperature 

分 类 号：TM912[电气工程—电力电子与电力传动]