Mitigating Lattice Distortion of High‑Voltage LiCoO_(2)via Core‑Shell Structure Induced by Cationic Heterogeneous Co‑Doping for Lithium‑Ion Batteries

作     者：Zezhou Lin Ke Fan Tiancheng Liu Zhihang Xu Gao Chen Honglei Zhang Hao Li Xuyun Guo Xi Zhang Ye Zhu Peiyu Hou Haitao Huang Zezhou Lin;Ke Fan;Tiancheng Liu;Zhihang Xu;Gao Chen;Honglei Zhang;Hao Li;Xuyun Guo;Xi Zhang;Ye Zhu;Peiyu Hou;Haitao Huang

作者机构：Department of Applied Physics and Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China Department of Applied PhysicsThe Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China Institute of Nanosurface Science and EngineeringGuangdong Provincial Key Laboratory of Micro/Nano Optomechatronics EngineeringShenzhen UniversityShenzhenPeople’s Republic of China School of Physics and TechnologyUniversity of JinanJinanShandongPeople’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2024年第16卷第3期

页      面：169-182页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：the Hong Kong Polytechnic University(Q-CDBG),the Science and Technology Program of Guangdong Province of China(2020A0505090001) the Research Grants Council of the Hong Kong Special Administrative Region,China(Project No.PolyU152178/20E) the National Natural Science Foundation of China(22379052) the Natural Science Foundation of Guangdong(No.2022A1515011667) China Postdoctoral Science Foundation(2021T140268) 

主　　题：Lithium-ion battery LiCoO_(2) Heterogeneous co-doping Core-shell structure High-voltage stability 

摘      要：Inactive elemental doping is commonly used to improve the structural stability of high-voltage layered transition-metal oxide ***,the one-step co-doping strategy usually results in small grain size since the low diffusivity ions such as Ti^(4+)will be concentrated on grain boundaries,which hinders the grain *** order to synthesize large single-crystal layered oxide cathodes,considering the different diffusivities of different dopant ions,we propose a simple two-step multi-element co-doping strategy to fabricate core–shell structured LiCoO_(2)(CS-LCO).In the current work,the high-diffusivity Al^(3+)/Mg^(2+)ions occupy the core of single-crystal grain while the low diffusivity Ti^(4+)ions enrich the shell *** Ti^(4+)-enriched shell layer(~12 nm)with Co/Ti substitution and stronger Ti–O bond gives rise to less oxygen ligand ***-situ XRD demonstrates the constrained contraction of c-axis lattice parameter and mitigated structural *** a high upper cut-off voltage of 4.6 V,the single-crystal CS-LCO maintains a reversible capacity of 159.8 mAh g^(−1)with a good retention of~89%after 300 cycles,and reaches a high specific capacity of 163.8 mAh g^(−1)at *** proposed strategy can be extended to other pairs of low-(Zr^(4+),Ta^(5+),and W6+,etc.)and high-diffusivity cations(Zn^(2+),Ni^(2+),and Fe^(3+),etc.)for rational design of advanced layered oxide core–shell structured cathodes for lithium-ion batteries.