Achieving thermodynamic stability of single-crystal ultrahigh-nickel cathodes via an alcohol-assisted mechanical fusion  

作　　者：Zhi Zhang Tiancheng Liu Ce Gao Yun Liu Hailan Kuai Hongli Du Wanli You Xiaobing Huang Jixue Shen Haitao Huang Yuefeng Su Lai Chen 

机构地区：[1]Hunan Provincial Key Laboratory of Water Treatment Functional Materials,College of Chemistry and Materials Engineering,Hunan University of Arts and Science,Changde 415000,Hunan,China [2]School of Materials Science and Engineering,Beijing Key Laboratory of Environmental Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [3]College of Chemistry and Materials Science,Hebei University,Baoding 071002,Hebei,China [4]Department of Applied Physics and Research Institute for Smart Energy,The Hong Kong Polytechnic University,Hong Kong 999077,China [5]MCC Ramu New Energy Technology Co.,Ltd.,Tangshan 063000,Hebei,China

出　　处：《Journal of Energy Chemistry》2024年第12期580-592,共13页能源化学（英文版）

基　　金：the support from the Natural Science Foundation of Hunan Province,China(2024JJ7301);the science and technology innovation Program of Hunan Province(2024JK2097);the Project of the Scientific Research Fund of Hunan Provincial Education Department(No.22C0383);Changde Scientific and Technological Innovation Plan(CDKJJ20220517);Start-up Foundation for Doctors of Hunan University of Arts and Science(No.22BSQD22,21BSQD14 and 21BSQD15);Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province;partially supported by the Research Grants Council of the Hong Kong Special Administrative Region,China(PolyU152178/20E);the Innovation and Technology Commission of Hong Kong(MHP/080/22)。

摘　　要：Elevating the operating voltage is an effective approach to improve the reversible capacity of ultra-high nickel layered oxide cathode LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM,x≥0.8)and solve the"range anxiety"confusion of electric vehicles.However,the undesirable surface reconstruction induced by the high cut-off voltage has a fatal impact on the thermodynamic stability of the material,inevitably leading to fast capacity degradation.Herein,a mechanical fusion aided by alcohol is suggested to create a stable olivine structure for the single-crystal(SC)ultrahigh-nickel cathode LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2).The addition of nanoparticles effectively bridges the void of SC-NCM,builds an ideal particle grading,and significantly raises the cost efficiency,as well as promotes the cycling stability and safety of the full cell.Remarkably,the layered/olivine mixture forms a perfect shield by lowering the surface area between the NCM cathode and electrolyte,hence mitigating side reactions and contributing to an incredibly thin and stable cathode/electrolyte interface.Furthermore,the thermodynamic stability of highly delithiated NCM is improved,as both the particle cracks and structural degradation are simultaneously postponed.Consequently,the maximum temperature of the single-crystal LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)@LiFePO_(4)‖graphite pouch full cell is dramatically reduced from 599.4 to 351.4℃,and the full cell achieves 88.2%capacity retention after 800 cycles,demonstrating excellent thermal stability and cycling stability.This facile strategy provides a feasible technical reference for further exploiting the ultrahigh-capacity,highsafety,and long-life Ni-rich cathode for commercial application of lithium-ion batteries(LIBs).

关 键 词：Single-crystal LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2) LiFePO_(4)nano-particles Ultrahigh voltage Thermal stability Cycling stability 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.11[化学工程—无机化工]