Enhanced cycling stability and rate performance of Co-doped and La2O3-coated LiNi0.9Mn0.1O2 toward power battery

Jia-Qi Peng ¹Yuan-Yuan Wei ¹Dong-Ming Liu ²Yun Li ²Bin Hu ¹Bin Huang ¹Jian-Wen Yang ¹Shun-Hua Xiao ¹Ren-Heng Wang²

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作者信息

1. Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials,College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,China
2. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China
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Abstract

Ultra-high nickel layered oxide cathode mate-rial with high energy density is the most promising material to improve the electrochemical performance of lithium-ion batteries(LIBs).However,the poor structural stability and severe surface/interface side reactions of the material lead to poor rate performance and cyclic stability,which limits its application in practice.In this paper,the dual-modifi-cation strategy of Co doping and La2O3 coating is used to meet the above challenges.Co doping can effectively widen layer spacing and reduce Li+/Ni2+mixing,and La2O3 coating can effectively eliminate the residual alkali on the surface of active material,inhibit the thickening of cathode electrolyte interphase(CEI)film and reduce sur-face/interface side reactions.Therefore,the modified material(NM90-CL)with excellent electrochemical prop-erties is achieved through the synergistic enhancement of Co doping and La2O3 coating.Its capacity retention rate can reach 77.9％after 200 cycles at 1.0 ℃ and 75.7％after 200 cycles at 5.0 ℃.Its reversible capacity can up to 153.5 mAh·g-1 at 10.0 ℃.This dual-modification strategy will provide theoretical guidance and technical support for the synthesis of other high-performance electrode materials.

Key words

High nickel cathode material/Co doping/La2O3 coating/Electrochemical performance/Electrochemical mechanism

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基金项目

国家自然科学基金(22169007)

国家自然科学基金(22362011)

Science and Technology Major Project of Guangxi(AA19046001)

Open Research Fund of Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials(EMFM20201105)

Open Research Fund of Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials(EMFM20181119)

Characteristic Innovation Projects of Universities in Guangdong Province(2022KTSCX324)

Science and Technology Innovation Commission of Shenzhen(JCYJ20190808173815205)

University Teachers'Characteristic Innovation Research Project(2021XJZZ11)

出版年

2024

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDEI

影响因子：0.801

ISSN：1001-0521

参考文献量48

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