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Improving the Conductivity of Solid Polymer Electrolyte by Grain Reforming.

Zhaohuan WeiYaqi RenMinkang WangJijun HeWeirong HuoHui Tang
Published in: Nanoscale research letters (2020)
Polyethylene oxide (PEO)-based solid polymer electrolyte (SPE) is considered to have great application prospects in all-solid-state li-ion batteries. However, the application of PEO-based SPEs is hindered by the relatively low ionic conductivity, which strongly depends on its crystallinity and density of grain boundaries. In this work, a simple and effective press-rolling method is applied to reduce the crystallinity of PEO-based SPEs for the first time. With the rolled PEO-based SPE, the LiFePO4/SPE/Li all-solid li-ion battery delivers a superior rechargeable specific capacity of 162.6 mAh g-1 with a discharge-charge voltage gap of 60 mV at a current density of 0.2 C with a much lower capacity decay rate. The improvement of electrochemical properties can be attributed to the press-rolling method, leading to a doubling conductivity and reduced activation energy compared with that of electrolyte prepared by traditional cast method. The present work provides an effective and easy-to-use grain reforming method for SPE, worthy of future application.
Keyphrases
  • ion batteries
  • solid state
  • ms ms
  • ionic liquid
  • solid phase extraction
  • gold nanoparticles
  • mass spectrometry
  • high resolution
  • solar cells