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In Situ Visualized Cathode Electrolyte Interphase on LiCoO2 in High Voltage Cycling.

Wei Lu1, Jiansheng Zhang1, Jingjing Xu1

  • 1i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences , Suzhou 215123, P.R. China.

ACS Applied Materials & Interfaces
|May 13, 2017
PubMed
Summary

Investigating cathode-electrolyte interphase (CEI) formation on lithium cobalt oxide (LiCoO2) at high voltages revealed it occurs at the edge plane. Coating with aluminum oxide (Al2O3) suppressed CEI and improved battery cycle stability.

Keywords:
cathode electrolyte interphase (CEI)in situ atomic force microscopylithium cobalt oxide (LiCoO2)lithium ion batterysolid-electrolyte interphase (SEI)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Higher charging voltages for lithium-ion battery cathode materials like LiCoO2 can boost energy density.
  • However, high-voltage cycling degrades battery life due to lattice instability and electrolyte oxidation.
  • Understanding and mitigating the cathode-electrolyte interphase (CEI) is vital for high-voltage stability.

Purpose of the Study:

  • To investigate the in situ formation of the cathode-electrolyte interphase (CEI) on LiCoO2 at high voltages.
  • To understand the role of CEI in cathode degradation during high-voltage operation.
  • To evaluate the effectiveness of Al2O3 coating in suppressing CEI and enhancing cycle stability.

Main Methods:

  • In situ atomic force microscopy (AFM) was employed to observe CEI formation on LiCoO2.
  • High-voltage cycling experiments were conducted on bare and Al2O3-coated LiCoO2.
  • Coin cell performance was evaluated to assess cycle stability.

Main Results:

  • CEI formation was exclusively observed at the edge planes of LiCoO2, not the basal planes.
  • A thin Al2O3 coating effectively suppressed CEI formation at the edge planes.
  • Al2O3-coated LiCoO2 demonstrated significantly improved high-voltage cycle stability in coin cells.

Conclusions:

  • The edge plane of LiCoO2 is a critical site for high-voltage CEI formation.
  • Al2O3 coating acts as a protective layer, preventing detrimental CEI growth.
  • Surface modification with Al2O3 is a promising strategy to enhance the cycle life of high-voltage Li-ion batteries.