DOI QR코드

DOI QR Code

Degradation of All-Solid-State Lithium-Sulfur Batteries with PEO-Based Composite Electrolyte

  • Lee, Jongkwan (Korea Institute of Industrial Technology (KITECH)) ;
  • Heo, Kookjin (Korea Institute of Industrial Technology (KITECH)) ;
  • Song, Young-Woong (Korea Institute of Industrial Technology (KITECH)) ;
  • Hwang, Dahee (Korea Institute of Industrial Technology (KITECH)) ;
  • Kim, Min-Young (Korea Institute of Industrial Technology (KITECH)) ;
  • Jeong, Hyejeong (Korea Institute of Industrial Technology (KITECH)) ;
  • Shin, Dong-Chan (Department of Advanced Materials Engineering, Chosun University) ;
  • Lim, Jinsub (Korea Institute of Industrial Technology (KITECH))
  • 투고 : 2021.09.07
  • 심사 : 2021.10.15
  • 발행 : 2022.05.28

초록

Lithium-sulfur batteries (LSBs) have emerged as a promising alternative to lithium-ion batteries (LIBs) owing to their high energy density and economic viability. In addition, all-solid-state LSBs, which use solid-state electrolytes, have been proposed to overcome the polysulfide shuttle effect while improving safety. However, the high interfacial resistance and poor ionic conductivity exhibited by the electrode and solid-state electrolytes, respectively, are significant challenges in the development of these LSBs. Herein, we apply a poly (ethylene oxide) (PEO)-based composite solid-state electrolyte with oxide Li7La3Zr2O12 (LLZO) solid-state electrolyte in an all-solid-state LSB to overcome these challenges. We use an electrochemical method to evaluate the degradation of the all-solid-state LSB in accordance with the carbon content and loading weight within the cathode. The all-solid-state LSB, with sulfur-carbon content in a ratio of 3:3, exhibited a high initial discharge capacity (1386 mAh g-1), poor C-rate performance, and capacity retention of less than 50%. The all-solid-state LSB with a high loading weight exhibited a poor overall electrochemical performance. The factors influencing the electrochemical performance degradation were revealed through systematic analysis.

키워드

과제정보

This study was conducted with the support of the Korea Institute of Industrial Technology, as "Development of technology for commercialization of anodes for lithium metal batteries by bonding Li/Cu heterogeneous material (KITECH EM-21-0007)".

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