Enhanced stability and electrochemical properties of lanthanum and cerium co-modified LiVOPO_(4) cathode materials for Li-ion batteries  

作　　者：Zishan Ahsan Zhenfei Cai Shuai Wang Haichuan Wang Yangzhou Ma Guangsheng Song Shihong Zhang Weidong Yang Muhammad Imran Cuie Wen 

机构地区：[1]Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,School of Materials Science and Engineering,Anhui University of Technology,Maanshan,243000,China [2]School of Metallurgical Engineering,Anhui University of Technology,Maanshan,243002,China [3]Future Manufacturing Flagship,Commonwealth Scientific and Industry Research Organization,Melbourne,Victoria,3168,Australia [4]Department of Chemistry,Faculty of Science,King Khalid University,Abha,61413,Saudi Arabia [5]School of Engineering,RMIT University,Bundoora,Victoria,3083,Australia

出　　处：《Journal of Rare Earths》2023年第10期1590-1596,I0005,共8页稀土学报（英文版）

基　　金：the Anhui Natural Science Foundation(1908085ME151,KJ2020A0263);China Po stdoctoral Science Foundation(2020M673404);Anhui Province High-end Talent Grant(DT18100044);the National Level Foreign Expert Introduction Plan(G20190219004);the National Natural Science Foundation of China(52207246)。

摘　　要：A facile and efficient ball-milling assisted sol-gel synthesis route was developed to prepare triclinic e-LiVOPO_(4)(LVOP)material with lanthanum(La)and cerium(Ce)modification individually as well as simultaneously.An LVOP/LaPO_(4)/CePO_(4)composite cathode material was successfully synthesized and results show that La and Ce co-modification noticeably improves the electrochemical performance by enhancing the high voltage capacity upon cycling,which indicates contributions from the good ionic conductors LaPO_(4)and CePO_(4).The simultaneous La and Ce modification improves the high voltage performance significantly with an increase of 50%in high voltage capacity after 20 cycles compared to pure LVOP.It also shows stabilized cycling perfo rmance with 91%capacity rete ntion after 50 cycles at 0.1 C rate,along with high-rate capability with a capacity of 83.1 mAh/g compared to the pristine sample showing the capacity of 51.6 mAh/g at a high rate of 5C.This can be attributed to the good conductivity of LaPO_(4)and CePO_(4).In addition,the LVOP/LaPO_(4)/CePO_(4)composite and the pristine LVOP give a charge transfer resistance of-105 and-212Ω,respectively,showing much lower impedance due to a combination of La and Ce addition.

关 键 词：Li-ion bateries ε-LiVOP04 Cathode materials La Ce co-modification Enhanced stability Rare earths 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.11[化学工程—无机化工]