首页|A breathable inorganic-organic interface for fabricating a crack-free nickel-rich cathode with long-term stability

A breathable inorganic-organic interface for fabricating a crack-free nickel-rich cathode with long-term stability

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  • NETL
  • NSTL
  • Royal Soc Chemistry
Nickel (Ni)-rich layered oxide cathodes are essential energy materials for high-energy-density lithiumionbatteries owing to their high theoretical capacity. However, they are prone to serious structuralcollapse and an unstable cathode electrolyte interphase (CEI). Herein, we report a facile and novelhybrid organic–inorganic polyurea (HPU) coating to modify the surface of the LiNi_(0.94)Co_(0.05)Mn_(0.01)O_2 (Ni94) cathode via molecular layer deposition (MLD). Serving as a robust protective barrier, the HPUcoating effectively suppresses cathode–electrolyte side reactions and promotes the formation ofan ultra-thin CEI. Simultaneously, the mechanically stable and ‘breathable’ HPU coating maintains theintegrity of cathode particles during charge/discharge without inducing serious cracking. Moreover, thestabilized CEI prevents further crack-induced interphase degradation and near-surface phase transformation,suppressing the variation in the chemical state and local environment of Ni. As a result, thesurface-modified cathode can maintain 94.9% of its initial capacity in 200 cycles. This work highlightsthe importance of interphase engineering and outlines a new pathway towards forming a high-energyand stable Ni-rich layered cathode.

Yipeng Sun、Jinjin Ma、Duojie Wu、Changhong Wang、Yang Zhao、Matthew Zheng、Ruizhi Yu、Weihan Li、Minsi Li、Yingjie Gao、Xiaoting Lin、Hui Duan、Jiamin Fu、Zhiqiang Wang、Ruying Li、M. Danny Gu、Tsun-Kong Sham、Xueliang Sun

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Department of Mechanical and Materials Engineering, University of WesternOntario, London, Ontario, N6A 5B9, Canada

Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo,Zhejiang, 315200, P. R. China

Department of Mechanical and Materials Engineering, University of WesternOntario, London, Ontario, N6A 5B9, Canada||Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo,Zhejiang, 315200, P. R. China

Department of Chemistry, University of Western Ontario, London, Ontario,N6A 5B7, Canada

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2024

10.1039/d4ee01254b

Energy & environmental science: EES

Energy & environmental science: EES

ISSN：1754-5692
年,卷(期)：2024.17(14)
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