Constructing stable surface structures enabling fast charging for Li-rich layered oxide cathodes

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

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Author(s)

  • Shihao Li
  • Haiyan Zhang
  • Shuai Zhang
  • Yanqing Lai
  • Zhian Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number132036
Journal / PublicationChemical Engineering Journal
Volume427
Online published26 Aug 2021
Publication statusPublished - 1 Jan 2022

Abstract

Li-rich Mn-based layered oxides (LLOs) exhibiting ultrahigh specific capacity larger than 250 mAh g−1 have become the most promising cathode candidate for high energy density lithium-ions batteries (LIBs). Fast charging capability and cycling stability are highly desirable for LIBs so as to satisfy specific application scenarios such as electric vehicles. However, stable cycling and fast charging properties are severely hindered by obstacles including irreversible oxygen release, structural degradation and poor reaction kinetics. In this work, an integrative and facile surface structures constructing strategy to achieve stable cycling and fast charging in LLOs was provided. Oxygen vacancies and double coating layers including lithium phosphate layer and spinel layer were constructed on the surface through ammonium dihydrogen phosphate (NH4H2PO4) pretreatment. The designed material with induced stable bi-phase coating layers delivers a high discharge specific capacity of 284.6 mAh g−1 at 0.1 C with an ultrahigh initial coulombic efficiency of 95.3% and excellent rate performance of 132.2 mAh g−1 at 10 C. Even after 100 cycles, it can display a remarkable capacity of 215.8 mAh g−1 under 1 C/1 C and 205.1 mAh g−1 under 3 C/1 C. The excellent fast charging performance and cycling stability can be attributed to accelerated Li+ transportation rate due to its surface ion conductive layer and surface spinel phase layer, as well as suppressed oxygen release, transition metals dissolution and electrolyte attack resulting from surface oxygen vacancies and dual protective layers.

Research Area(s)

  • Dual coating layers, Fast charging, Li-rich cathode, Surface structures constructing

Citation Format(s)

Constructing stable surface structures enabling fast charging for Li-rich layered oxide cathodes. / Li, Shihao; Li, Huangxu; Zhang, Haiyan; Zhang, Shuai; Lai, Yanqing; Zhang, Zhian.

In: Chemical Engineering Journal, Vol. 427, 132036, 01.01.2022.

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