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Surface Phase Conversion in a High-Entropy Layered Oxide Cathode Material.

Qinfeng Zheng1, Zhouhong Ren1, Yixiao Zhang1

  • 1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Electrochemical Energy Device Research Center (SEED) and in-situ Center for Physical Sciences, Shanghai Jiao Tong University, Shanghai200240, P. R. China.

ACS Applied Materials & Interfaces
|January 11, 2023
PubMed
Summary
This summary is machine-generated.

High-entropy layered oxides show promise for lithium-ion batteries but suffer from rapid capacity fading. A new study reveals that metal ion migration forms a surface phase, hindering lithium intercalation and causing poor battery performance.

Keywords:
capacity fadingcathode materialhigh-entropy layered oxidesintercalationlithium-ion batteriesmechanism

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-state Chemistry

Background:

  • High-entropy layered oxides are promising cathode materials for lithium-ion batteries due to their 2D ion transport channels.
  • Current high-entropy layered oxides exhibit significant capacity fading, limiting their practical application.

Purpose of the Study:

  • To investigate the structural and property changes in a five-element high-entropy layered oxide, LiNi0.2Co0.2Mn0.2Fe0.2Al0.2O2.
  • To understand the mechanism behind the poor electrochemical performance of these materials.

Main Methods:

  • Electrochemical characterization techniques.
  • Physical characterization techniques.

Main Results:

  • The formation of an M3O4 phase at the surface of LiNi0.2Co0.2Mn0.2Fe0.2Al0.2O2 was observed.
  • Metal ion migration from octahedral to tetrahedral and octahedral sites in the lithium layer was identified as the cause of the M3O4 phase.
  • This surface phase impedes lithium-ion intercalation, leading to low initial Coulombic efficiency and rapid capacity decay.

Conclusions:

  • The observed mechanism of metal ion migration and subsequent surface phase formation is responsible for the poor performance of this high-entropy layered oxide.
  • This finding provides a general explanation for the capacity fading issues in various high-entropy layered oxides.