Pseudo-Bonding and Electric-Field Harmony for Li-Rich Mn-Based Oxide Cathode

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

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Author(s)

  • Jun Chen
  • Guoqiang Zou
  • Wentao Deng
  • Xu Gao
  • Cheng Liu
  • Shouyi Yin
  • Huanqing Liu
  • Xinglan Deng
  • Ye Tian
  • Jiayang Li
  • Chiwei Wang
  • Di Wang
  • Hanwen Wu
  • Li Yang
  • Hongshuai Hou
  • Xiaobo Ji

Detail(s)

Original languageEnglish
Article number2004302
Journal / PublicationAdvanced Functional Materials
Volume30
Issue number46
Online published9 Sep 2020
Publication statusPublished - 11 Nov 2020

Abstract

The practical application of Li-rich Mn-based oxide cathode is predominately retarded by the capacity decline and voltage fading, associated with the structure distortion and anionic redox reactions. Here, a linkage-functionalized modification approach to tackle these challenges via a synchronous lithium oxidation strategy is reported. The doping of Ce in the bulk phase activates the pseudo-bonding effect, effectively stabilizing the lattice oxygen evolution and suppressing the structure distortion. Interestingly, it also induces the formation of spinel phase Li4Mn5O12 in the subsurface, which in turn constructs the phase boundaries, thereby arousing the interior self-built-in electric field to prevent the outward migration of bulk oxygen anions and boost the charge transfer. Moreover, the formed coating layer Li2CeO3 with oxygen vacancies accelerates Li+ diffusion and mitigates electrolyte cauterization. The corresponding cathode exhibits superior long-cycle stability after 300 cycles with only a 0.013% capacity drop and 1.76 mV voltage decay per cycle. This work sheds new light on the development of Li-rich Mn-based oxide cathodes toward high energy density applications.

Research Area(s)

  • charge transfer, electric-field, lattice oxygen evolution, Li-rich Mn-based oxide cathodes, pseudo-bonding

Citation Format(s)

Pseudo-Bonding and Electric-Field Harmony for Li-Rich Mn-Based Oxide Cathode. / Chen, Jun; Zou, Guoqiang; Deng, Wentao; Huang, Zhaodong; Gao, Xu; Liu, Cheng; Yin, Shouyi; Liu, Huanqing; Deng, Xinglan; Tian, Ye; Li, Jiayang; Wang, Chiwei; Wang, Di; Wu, Hanwen; Yang, Li; Hou, Hongshuai; Ji, Xiaobo.

In: Advanced Functional Materials, Vol. 30, No. 46, 2004302, 11.11.2020.

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