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

引用

Journal of Rare Earths 2023年第10期41卷 1590-1596,I0005页

作者： Zishan Ahsan Zhenfei Cai Shuai Wang Haichuan Wang Yangzhou Ma Guangsheng Song Shihong Zhang Weidong Yang Muhammad Imran Cuie Wen Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of EducationSchool of Materials Science and EngineeringAnhui University of TechnologyMaanshan243000China School of Metallurgical Engineering Anhui University of TechnologyMaanshan243002China Future Manufacturing Flagship Commonwealth Scientific and Industry Research OrganizationMelbourneVictoria3168Australia Department of Chemistry Faculty of ScienceKing Khalid UniversityAbha61413Saudi Arabia School of Engineering RMIT UniversityBundooraVictoria3083Australia

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

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