Stabilizing effects of atomic Ti doping on high-voltage high-nickel layered oxide cathode for lithium-ion rechargeable batteries  

作　　者：Yong Cheng Yan Sun Changting Chu Limin Chang Zhaomin Wang Dongyu Zhang Wanqiang Liu Zechao Zhuang Limin Wang 

机构地区：[1]Key Laboratory of Preparation and Applications of Environmental Friendly Materials(Ministry of Education),Jilin Normal University,Changchun 130103,China [2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [3]School of materials science and engineering,Changchun University of Science and Technology,Changchun 130022,China [4]Department of Chemistry,Tsinghua University,Beijing 100084,China

出　　处：《Nano Research》2022年第5期4091-4099,共9页纳米研究（英文版）

基　　金：This work is financially supported by the National Key R&D Program of China(No.2017YFE0198100);the National Natural Science Foundation of China(Nos.21975250 and 52072145);the Beijing Natural Science Foundation(No.2214061);the Scientific and Technological Developing Project of Jilin Province,China(No.YDZJ202101ZYTS185);the Capital Construction Fund Projects within the Budget of Jilin Province,China(No.2021C037-2);the Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials(Jilin Normal University),Ministry of Education,China(No.2020005);the Open Program of State Key Laboratory of Metastable Materials Science and Technology(Yanshan University),China(No.202110).

摘　　要：High-voltage high-nickel lithium layered oxide cathodes show great application prospects to meet the ever-increasing demand for further improvement of the energy density of rechargeable lithium-ion batteries(LIBs)mainly due to their high output capacity.However,severe bulk structural degradation and undesired electrode-electrolyte interface reactions seriously endanger the cycle life and safety of the battery.Here,2 mol%Ti atom is used as modified material doping into LiNi_(0.8)Co_(0.2)Mn_(0.2O2)(NCM)to reform LiNi_(0.6)Co_(0.2)Mn_(0.18)Ti_(0.02)O_(2)(NCM-Ti)and address the long-standing inherent problem.At a high cut-off voltage of 4.5 V,NCM-Ti delivers a higher capacity retention ratio(91.8%vs.82.9%)after 150 cycles and a superior rate capacity(118 vs.105 mAh·g^(-1))at the high current density of 10 C than the pristine NCM.The designed high-voltage full battery with graphite as anode and NCM-Ti as cathode also exhibits high energy density(240 Wh·kg^(-1))and excellent electrochemical performance.The superior electrochemical behavior can be attributed to the improved stability of the bulk structure and the electrode-electrolyte interface owing to the strong Ti-O bond and no unpaired electrons.The in-situ X-ray diffraction analysis demonstrates that Ti-doping inhibits the undesired H2-H3 phase transition,minimizing the mechanical degradation.The ex-situ TEM and X-ray photoelectron spectroscopy reveal that Ti-doping suppresses the release of interfacial oxygen,reducing undesired interfacial reactions.This work provides a valuable strategic guideline for the application of high-voltage high-nickel cathodes in LIBs.

关 键 词：lithium-ion battery high-voltage high-nickel cathode Ti-doping structural stability interface stability 

分 类 号：TM912[电气工程—电力电子与电力传动]