Alleviating structural degradation of nickel-rich cathode material by eliminating the surface Fm3¯m phase

Feng Wu, Jun Tian, Na Liu, Yun Lu*, Yuefeng Su, Jing Wang, Renjie Chen, Xu Ma, Liying Bao, Shi Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Nickel-rich LiNixM1-xO2 (M=Co, Mn or Al, x>0.6) oxide owns high capacity and energy density as cathode material for Li-ion batteries. However, the severe structural decay during cycling impedes its commercialization. In our work, the rock-salt Fm 3¯ m phase on the LiNi0.8Co0.1Mn0.1O2 particle surface which can induce the structural instability during cycling is inhibited to produce: LiNi0.71Co0.09Mn0.2O2 cathode material composes of a uniform layered R3¯m phase with a self-assembled concentration-gradient shell is prepared using Mn precursor coating on Ni0.8Co0.1Mn0.1(OH)2. This material shows enhanced structural stability due to the removal of Fm 3¯ m phase, contributing to capacity retention of 92.2% after 100 cycles at 0.1 C rate between 2.8 and 4.5 V. In addition, the thermal stability is also improved after the elimination of Fm3¯m phase.

Original languageEnglish
Pages (from-to)134-140
Number of pages7
JournalEnergy Storage Materials
Volume8
DOIs
Publication statusPublished - Jul 2017

Keywords

  • Lithium-ion batteries
  • Nickel-rich cathode
  • Self-assembled shell
  • Structural stability
  • Surface structure

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