Surface spinel reconstruction to suppress detrimental phase transition for stable LiNi0.8Co0.1Mn0.1O2 cathodes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Qingmeng Gan
  • Zhiqiang Li
  • Kemeng Liao
  • Li Lu
  • Zhenghe Xu
  • Zhouguang Lu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Number of pages8
Journal / PublicationNano Research
Online published4 Aug 2022
Publication statusOnline published - 4 Aug 2022

Abstract

Nickel-rich layered oxides are attractive cathode for lithium-ion batteries (LIBs) because of the high energy density and low cost. The critical problem is capacity fading caused by the highly reactive metastable phases under voltages of higher than 4.15 V. Herein, we find that facile Ar/H2 plasma treating could produce oxygen vacancies that will readily transform into homogeneous spinel layer (~ 6 nm) on the LiNi0.8Co0.1Mn0.1O2 (NCM811) surface after a few cycles of lithiation/delithiation procedure. Owing to the structural matching between spinel and layered structure, the diffusion of Li ions could remain fast upon cycling. Besides, the spinel layer is electrochemically inert, which guarantees surface stabilization and inhibits the detrimental phase transition from H2 to H3 at high voltages. Under the protection of the homogeneous spinel layer, the NCM811 electrode shows superior capacity retention of 91.2% after 200 cycles at the current density of 100 mA·g−1. This work proposes a novel strategy of surface reconstruction to stabilize nickel-rich layered oxide materials for LIBs.

Research Area(s)

  • lithium-ion batteries, nickel-rich cathode, surface spinel reconstruction, phase transition, superior stability