Surface decoration of mesocarbon microbeads with multifunctional TiNbO_(4-x)@C coating layer as high rate and stable anode of Li-ion batteries

作     者：Jia-Mei Lai Zhi-Min Zou Yu Bai Yu-Tao Xing Chun-Hai Jiang Jia-Mei Lai;Zhi-Min Zou;Yu Bai;Yu-Tao Xing;Chun-Hai Jiang

作者机构：Fujian Provincial Key Laboratory of Functional Materials and ApplicationsInstitute of Advanced Energy MaterialsSchool of Materials Science and EngineeringXiamen University of TechnologyXiamen 361024China Shanghai XFH Science and Technology Development Co.Ltd.Shanghai 200949China Fujian XFH New Energy Materials Co.Ltd.Yong'an 366000China Shenzhen XFH Science and Technology Co.Ltd.Shenzhen 518071China Laboratorio de Microscopia Eletronica de Alta ResolucaoCentro de Caracterizagao Avangada Para a Industria de Petroleo(LaMAR/CAIPE)Universidade Federal FluminenseNiteroiRJ 24210-346Brazil 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2024年第43卷第5期

页      面：2053-2066页

核心收录：

学科分类：0808[工学-电气工程] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Natural Science Foundation Project of Fujian Province(Nos.2020J01287 and 2020H0024) 

主　　题：Li-ion batteries MCMB TiNbO_(4-x)@C Surface decoration Rate capability 

摘      要：Surface modification of graphite anode with electroactive matters has been proven of a more practical strategy in enhancing the performance of Li-ion batteries than exploring alternative novel anode ***,rutile TiNbO_(4-x) nanoparticles with a tunnel structure are employed as multifunctional decoration substances in combination with a carbon coating layer to improve the rate and cycle properties of mesocarbon microbeads(MCMBs).As compared to pristine MCMB,the Li^(+)diffusion coefficients of the composite anodes are enhanced due to the synergistic effect of TiNbO_(4-x)@***,the overcharge and voltage polarization of the composite anodes at high rate are obviously minimized due to the current sharing effect of the high-potential TiNbO_(4-x).Moreover,the amorphous Li_(y)TiNbO_(4-x) converted from TiNbO_(4-x) in the initial lithiation process can deliver pseudocapacitive capacity to the composite anodes from the second *** of these functions of TiNbO_(4-x)@Ccoating layer have directly contributed to the improved rate and cycle performance of the MCMB/TiNbO_(4-x)@C composite *** one containing 12.0 wt%TiNbO_(4-x) exhibits a high reversible specific capacity of 118 m Ah·g^(-1)at 10C(1C=372 m A·g^(-1)),together with a high capacity retention of 90.9%after 300 cycles at 3C,which are all much superior to those of pristine MCMB.