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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Efficient cell design and fabrication of concentration-gradient composite electrodes for high-power and high-energy-density all-solid-state batteries

  • Kim, Ju Young (ICT Creativity Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Kim, Jumi (ICT Creativity Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Kang, Seok Hun (ICT Creativity Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Shin, Dong Ok (ICT Creativity Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Lee, Myeong Ju (ICT Creativity Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Oh, Jimin (ICT Creativity Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Lee, Young-Gi (ICT Creativity Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Kim, Kwang Man (ICT Creativity Research Laboratory, Electronics and Telecommunications Research Institute)
  • Received : 2019.04.09
  • Accepted : 2019.07.05
  • Published : 2020.02.07
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Abstract

All-solid-state batteries are promising energy storage devices in which high-energy-density and superior safety can be obtained by efficient cell design and the use of nonflammable solid electrolytes, respectively. This paper presents a systematic study of experimental factors that affect the electrochemical performance of all-solid-state batteries. The morphological changes in composite electrodes fabricated using different mixing speeds are carefully observed, and the corresponding electrochemical performances are evaluated in symmetric cell and half-cell configurations. We also investigate the effect of the composite electrode thickness at different charge/discharge rates for the realization of all-solid-state batteries with high-energy-density. The results of this investigation confirm a consistent relationship between the cell capacity and the ionic resistance within the composite electrodes. Finally, a concentration-gradient composite electrode design is presented for enhanced power density in thick composite electrodes; it provides a promising route to improving the cell performance simply by composite electrode design.

Keywords

References

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