Breakthrough in Energy Storage: Sea Cucumber Inspired Electrolyte Enhances Lithium Metal Battery Performance

Strategic Insights -

Researchers from Jilin University in China have developed a novel solid electrolyte inspired by the structure of a sea cucumber's skin, which exhibits exceptional mechanical stability, autonomous self-healing capability, and stable lithium deposition/stripping for over 3800 hours. The electrolyte, dubbed PVCTF-SPE, has been shown to achieve an ionic conductivity of 1.21 x 10(-4) S cm(-1) and expand the electrochemical window to 4.8 V, making it an attractive candidate for next-generation lithium metal batteries.

Key Takeaways:

  • The PVCTF-SPE electrolyte is inspired by biomimetic design principles, specifically the hydrogen-bond interactions in the sea cucumber's skin, which enables it to decouple the intrinsic trade-off in polymer-in-salt electrolytes (PISEs).
  • The introduced multi-NH-OC hydrogen-bond interactions in PVCTF-SPE impart exceptional stretchability (1380% strain), autonomous self-healing capability, and stable lithium deposition/stripping for 3800 h in Li/Li symmetric cells.
  • The PVCTF-SPE electrolyte exhibits superior elastic deformation behavior, strong Li-PVCTF interfacial adhesion, and flame-retardant characteristics, making it suitable for high-strain-rate applications.
  • A 1.5 Ah Li/LiFePO4 pouch cell demonstrates stable cycling performance (100 cycles, 70% capacity retention) under 7.5% tensile strain.
  • The research concludes that hydrogen bond engineering provides a universal paradigm for developing solid electrolytes with synergistically enhanced ion transport and mechanical stability.

Statistics:

  • Ionic conductivity of PVCTF-SPE: 1.21 x 10(-4) S cm(-1)
  • Stretchability of PVCTF-SPE: 1380%
  • Li deposition/stripping duration: 3800 h
  • Electrochemical window: 4.8 V
  • Cycle performance of 1.5 Ah Li/LiFePO4 pouch cell: 100 cycles, 70% capacity retention
  • Tensile strain: 7.5%

Sources:

  • Energy Storage Materials, 2025;80
  • Elsevier, Radarweg 29, 1043 Nx Amsterdam, Netherlands (published by)
  • Lijun Zhao, Jilin University, Ministry of Education, Key Laboratory of Automobile Materials, Changchun 130022, People's Republic of China (contact author)
  • Fuchen Song, Xinbo Pan, Feifei Zhang, and Junmin Yan (co-authors)
  • NewsRx. Findings from Jilin University in the Area of Energy Storage Reported (Sea Cucumber Inspired "polymer-in-salt Electrolyte" Boosting Dendrite-free and Flexible Lithium Metal Batteries). Energy Weekly News. August 15, 2025; p 90.