Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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UV-cured Polymer Solid Electrolyte Reinforced using a Ceramic-Polymer Composite Layer for Stable Solid-State Li Metal Batteries

  • Hye Min Choi (Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Su Jin Jun (Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Jinhong Lee (Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Myung-Hyun Ryu (Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Hyeyoung Shin (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kyu-Nam Jung (Renewable Energy Institute, Korea Institute of Energy Research)
  • Received : 2022.10.11
  • Accepted : 2022.10.16
  • Published : 2023.02.28
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Abstract

In recent years, solid-state Li metal batteries (SSLBs) have attracted significant attention as the next-generation batteries with high energy and power densities. However, uncontrolled dendrite growth and the resulting pulverization of Li during repeated plating/stripping processes must be addressed for practical applications. Herein, we report a plastic-crystal-based polymer/ceramic composite solid electrolyte (PCCE) to resolve these issues. To fabricate the one-side ceramic-incorporated PCCE (CI-PCCE) film, a mixed precursor solution comprising plastic-crystal-based polymer (succinonitrile, SN) with garnet-structured ceramic (Li7La3Zr2O12, LLZO) particles was infused into a thin cellulose membrane, which was used as a mechanical framework, and subsequently solidified by using UV-irradiation. The CI-PCCE exhibited good flexibility and a high room-temperature ionic conductivity of over 10-3 S cm-1. The Li symmetric cell assembled with CI-PCCE provided enhanced durability against Li dendrite penetration through the solid electrolyte (SE) layer than those with LLZO-free PCCEs and exhibited long-term cycling stability (over 200 h) for Li plating/stripping. The enhanced Li+ transference number and lower interfacial resistance of CI-PCCE indicate that the ceramic-polymer composite layer in contact with the Li anode enabled the uniform distribution of Li+ flux at the interface between the Li metal and CI-PCCE, thereby promoting uniform Li plating/stripping. Consequently, the Li//LiFePO4 (LFP) full cell constructed with CI-PCCE demonstrated superior rate capability (~120 mAh g-1 at 2 C) and stable cycle performance (80% after 100 cycles) than those with ceramic-free PCCE.

Keywords

Acknowledgement

This research was supported by the Korea Institute of Energy Research (KIER, Project No. C2-2465) and Chungnam National University.

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