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Semi-interpenetrating Solid Polymer Electrolyte for LiCoO2-based Lithium Polymer Batteries Operated at Room Temperature

Nguyen, Tien Manh;Suk, Jungdon;Kang, Yongku

  • Received : 2018.12.20
  • Accepted : 2019.02.26
  • Published : 2019.06.30

Abstract

Poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) show promise for improving the lithium ion battery safety. However, due to oxidation of the PEO group and corrosion of the Al current collector, PEO-based SPEs have not previously been effective for use in $LiCoO_2$ (LCO) cathode materials at room temperature. In this paper, a semi-interpenetrating polymer network (semi-IPN) PEO-based SPE was applied to examine the performance of a LCO/SPE/Li metal cell at different voltage ranges. The results indicate that the SPE can be applied to LCO-based lithium polymer batteries with high electrochemical performance. By using a carbon-coated aluminum current collector, the Al corrosion was mostly suppressed during cycling, resulting in improvement of the cell cycle stability.

Keywords

Li polymer battery;Poly(ethylene oxide);Solid polymer electrolytes;Semi-interpenetrating network;Al Corrosion

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Acknowledgement

Supported by : National Research Council of Science & Technology