Electrode-customized separator membranes based on self-assembled chiral nematic liquid crystalline cellulose nanocrystals as a natural material strategy for sustainable Li-metal batteries

Ji Young Seo, Yong Hyeok Lee, Jung Hui Kim, Young Kuk Hong, Wenshuai Chen, Young Gi Lee, Sang Young Lee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Despite their enormous potential as a high-energy-density power source, practical applications of Li-metal batteries have been plagued mainly by poor electrochemical longevity. Here, we present an electrode-customized separator (EC separator) based on self-assembled chiral nematic liquid crystalline cellulose nanocrystal (LC–CNC) as a natural material strategy to simultaneously address the electrochemical reversibility issues of both Li-metal anodes and high-capacity cathodes in Li-metal full cells. The EC separator (thickness ∼ 10 μm) comprises a 3-glycidyloxypropyl trimethoxysilane (GPTMS)-modified LC–CNC layer on a polyethylene (PE) separator support layer. The LC–CNC layer enables facile/uniform Li+ flux toward Li-metal anodes owing to its ordered nanoporous channels and nanofluidic ion migration effect, thus improving Li plating/stripping cyclability. The GPTMS of the LC–CNC layer chelates heavy metal ions dissolved from high-capacity LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes, thereby enhancing structural stability of the cathodes. The resulting EC separator enables a Li-metal full cell to improve the volumetric energy density (1016 Wh Lcell−1), cycling retention (84% after 100 cycles vs. 0% for the pristine PE separator), and dimensional stability of the Li-metal anode under constrained cell conditions (thin Li-metal anode (20 μm)/high-capacity NCM811 cathode), which outperform those of previously reported synthetic material-based separators for Li-metal full cells.

Original languageEnglish
Pages (from-to)783-791
Number of pages9
JournalEnergy Storage Materials
Volume50
DOIs
Publication statusPublished - 2022 Sept

Bibliographical note

Publisher Copyright:
© 2022

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Energy Engineering and Power Technology

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