XPS Investigation of the Electrolyte Induced Stabilization of LiCoO2 and “AlPO4”-Coated LiCoO2 Composite Electrodes

The “AlPO 4 ” coating has been shown to improve the electrochemical performance of LiCoO 2 batteries. We previously showed that the “AlPO 4 ” coating promotes the formation of metal fluorides, which could act as a stable surface film and protect LiCoO 2 from continuous degradation upon cycling. In this work, we removed the fluorine source in the LiPF 6 salt by using the LiClO 4 salt and investigated the effectiveness of the “AlPO 4 ” coating. Interestingly, the “AlPO 4 ” coating was found to improve the voltage efficiency and capacity retention when cycling in the LiPF 6 electrolyte, but was detrimental when cycling in the LiClO 4 electrolyte. XPS revealed that the “AlPO 4 ” coating promotes the formation of metal fluoride in both electrolytes, with the surface film formed in LiClO 4 being more electrically resistive compared to that formed in LiPF 6 . The source of fluorine in the coated electrode cycled in LiPF 6 is largely attributed to the LiPF 6 salt whereas the source of fluorine in the coated electrode cycled in LiClO 4 is the binder PVDF. We believe that the coating could react with HF impurity in the LiPF 6 electrolyte or from the binder PVDF and form stable metal fluoride films on the surface. vs. Li + if cycled to than 4.2 in capacity loss. 3,4 Structural instability 3,5 and reactivity of the cathode with the electrolyte 3 proposed as modification

• Publication year

  2016

• Venue

  Journal of The Electrochemical Society

• Publication date

  Unknown publication date

• Fields of study

  Materials Science, Chemistry, Engineering

• Identifiers
  DOI 10.1149/2.0851602JES
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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