A mechanism for the improved rate capability of cathodes by lithium phosphate surficial films

Research output: Contribution to journalArticle

Abstract

A Fire and quench method has been applied to coat LiCoO2 with a disordered Li3PO4 film. The coated LiCoO2 powders display a 50% increase in power density relative to uncoated powders. The improvement in rate capability is consistent with other observations of similar effects in the LiFePO4 system. The results suggest a new mechanism that explains the effects in both systems. The rate capability appears to be limited by ionic diffusion in the electrolyte and the power may derive from the surficial films ability to reduce concentration polarization perpendicular to the particles' surfaces.

Original languageEnglish (US)
Pages (from-to)200-202
Number of pages3
JournalElectrochemistry Communications
Volume13
Issue number2
DOIs
StatePublished - Feb 1 2011

Keywords

  • Electrolyte polarization
  • High power
  • LiPO
  • LiCoO
  • Surficial film

ASJC Scopus subject areas

  • Electrochemistry

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