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

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

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Elevating the operating voltage is an effective approach to improve the reversible capacity of ultra-high nickel layered oxide cathode LiNixCoyMnzO2(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 LiNi0.92Co0.04Mn0.04O2.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/oli-vine mixture forms a perfect shield by lowering the surface area between the NCM cathode and elec-trolyte,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 LiNi0.92Co0.04Mn0.04O2@LiFePO4||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,high-safety,and long-life Ni-rich cathode for commercial application of lithium-ion batteries(LIBs).

Single-crystal LiNi0.92Co0.04Mn0.04O2LiFePO4 nano-particlesUltrahigh voltageThermal stabilityCycling stability

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

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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

Department of Applied Physics and Research Institute for Smart Energy,The Hong Kong Polytechnic University,Hong Kong 999077,China

MCC Ramu New Energy Technology Co.,Ltd.,Tangshan 063000,Hebei,China

School of Materials Science and Engineering,Beijing Key Laboratory of Environmental Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

College of Chemistry and Materials Science,Hebei University,Baoding 071002,Hebei,China

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2024

10.1016/j.jechem.2024.07.041

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.99(12)