Enhancing Li NiO_(2) cathode materials by concentration-gradient yttrium modification for rechargeable lithium-ion batteries

作     者：Yudong Zhang Hang Li Junxiang Liu Jiuding Liu Hua Ma Fangyi Cheng Yudong Zhang;Hang Li;Junxiang Liu;Jiuding Liu;Hua Ma;Fangyi Cheng

作者机构：Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)Engineering Research Center of High-efficiency Energy Storage(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China Tianjin EV Energies Company Limited(JEVE)Tianjin 300380China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第12期

页      面：312-319,I0007页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：supported by the National Key R&D Program of China (2016YFA0202503) the SINOPEC Project (129015-1) the National Natural Science Foundation of China (21835004 and21925503) the 111 Project from the Ministry of Education of China(B12015) the Fundamental Research Funds for the Central Universities 

主　　题：Lithium-ion battery Concentration gradient Nickel-rich cathode Surface coating Yttrium oxide 

摘      要：Lithium nickel oxide(LiNiO_(2)) cathode materials are featured with high capacity and low cost for rechargeable lithium-ion batteries but suffer from severe interface and structure *** we report that rationally designed LiNiO_(2) via concentration-gradient yttrium modification exhibits alleviative side reactions and improved electrochemical *** LiNiO_(2) cathode with LiYO_(2)-Y_(2) O_(3) coating layer delivers a discharge capacity of 225 mAh g^(-1) with a high initial Coulombic efficiency of 93.4%.These improvements can be attributed to the formation of in-situ modified hybrid LiYO_(2)-Y_(2 O3) coating layer,which suppresses phase transformation,electrolyte oxidation and salt dissociation due to the formation of protective cathode electrolyte *** results indicate promising application of concentration-gradient yttrium coating as a facile approach to stabilize nickel-rich cathode materials.