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Electrochemically Driven Phase Transition in LiCoO2 Cathode.

Jinhui Tan1, Zhongzui Wang2, Guangzhao Li2

  • 1School of Automobile and Transportation, Xihua University, Chengdu 610039, China.

Materials (Basel, Switzerland)
|January 9, 2021
PubMed
Summary
This summary is machine-generated.

Lithium cobalt oxide (LiCoO2) cathode material degrades to Co3O4, causing capacity loss in lithium-ion batteries. Understanding and preventing this phase transition is key to achieving LiCoO2

Keywords:
Co3O4LiCoO2degradationphase transition

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Lithium cobalt oxide (LiCoO2) is a vital cathode material for lithium-ion batteries.
  • Its practical capacity is limited by irreversible phase transitions above 4.2 V, leading to significant capacity fading.
  • Degradation to cobalt oxide (Co3O4) is observed after extended cycling.

Purpose of the Study:

  • To investigate the electrochemically driven phase transition of LiCoO2.
  • To understand the transition pathway from layered LiCoO2 to cubic Co3O4.
  • To identify strategies for preventing phase transitions and enhancing LiCoO2 capacity.

Main Methods:

  • Crystallographic analysis of LiCoO2 structure.
  • Theoretical modeling of the LiCoO2 to Co3O4 transition path.
  • Experimental validation using doping with Al, In, Mg, and Zr.

Main Results:

  • A transition path from layered LiCoO2 to cubic Co3O4 was proposed.
  • Theoretical analysis revealed multiple stages in the electrochemically driven phase transition.
  • Doping with Al, In, Mg, and Zr demonstrated predicted behaviors, offering insights into stabilization.

Conclusions:

  • The study elucidates the mechanism of electrochemically driven phase transition in LiCoO2.
  • Preventing this phase transition is crucial for unlocking the theoretical capacity of LiCoO2.
  • Doping strategies show promise for stabilizing LiCoO2 and improving battery performance.