Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Semi-interpenetrating Solid Polymer Electrolyte for LiCoO2-based Lithium Polymer Batteries Operated at Room Temperature

  • Nguyen, Tien Manh (Center for Advanced Battery Materials, Advanced Materials Division, KRICT) ;
  • Suk, Jungdon (Center for Advanced Battery Materials, Advanced Materials Division, KRICT) ;
  • Kang, Yongku (Center for Advanced Battery Materials, Advanced Materials Division, KRICT)
  • Received : 2018.12.20
  • Accepted : 2019.02.26
  • Published : 2019.06.30
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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

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Fig. 5. Initial cyclic voltammetry of Al/SPE/Li cells using C-coated Al and bare Al current collector at a scan rate of 0.5 mV s-1 and at potential range from OCV to 4.5 V.

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Fig. 6. Nyquist plots of LCO/SPE/Li cell with potential range from 3 V to 4.2 V at 0.5 C using (a) C-coated Al and (b) bare Al.

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Fig. 1. (a) Temperature dependence of the ionic conductivity of SPE at various temperature range from - 10 to 100℃, (b) Linear sweep voltammetry of a stainless steel/SPE/Li metal coin cell at a scan rate of 0.5 mV s-1 and at potential range from 2 to 5.5 V.

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Fig. 2. Voltage profiles of LCO/SPE/Li cells with charge and discharge current density 0.1 C at different potential ranges.

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Fig. 3. (a) Rate capability of LCO/SPE/Li cells with various charge and discharge current density ranged from 0.2 C to 2 C at different potential ranges, (b) Capacity retention values of various discharge capacity.

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Fig. 4. (a) Cycling performance of LCO/SPE/Li cells using bare Al with different potential ranges at 0.5 C, (b) Cycling performance of LCO/SPE/Li cells using C-coated and bare Al with potential range from 3 V to 4.2 V at 0.5 C.

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