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

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

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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.

High nickel cathode materialCo dopingLa2O3 coatingElectrochemical performanceElectrochemical mechanism

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

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Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials,College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,China

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

国家自然科学基金国家自然科学基金Science and Technology Major Project of GuangxiOpen Research Fund of Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional MaterialsOpen Research Fund of Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional MaterialsCharacteristic Innovation Projects of Universities in Guangdong ProvinceScience and Technology Innovation Commission of ShenzhenUniversity Teachers'Characteristic Innovation Research Project

2216900722362011AA19046001EMFM20201105EMFM201811192022KTSCX324JCYJ201908081738152052021XJZZ11

2024

10.1007/s12598-023-02470-2

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
年,卷(期)：2024.43(2)
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