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Published in: Cellulose 9/2022

04-05-2022 | Original Research

Highly porous zeolitic imidazolate framework-8@bacterial cellulose composite separator with enhanced electrolyte absorption capability for lithium-ion batteries

Authors: Sufeng Zhang, Jin Luo, Min Du, Fengjiao Zhang, Xinning He

Published in: Cellulose | Issue 9/2022

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Abstract

Currently, the commercial polyolefin-based separators suffer from inferior electrolyte absorption capability and poor thermal stability, leading to unsatisfactory electrochemical performance and severe safety hazards for lithium-ion batteries (LIBs). Herein, a high-performance zeolitic imidazolate framework-8@bacterial cellulose (ZIF-8@BC) composite separator was fabricated via in-situ synthesizing ZIF-8 on BC nanofibers followed by filtration process. The ZIF-8 particles served as micro-spacers to prevent the dense packing of BC nanofibers during drying and significantly improved the porosity from 54.6 (pure BC separator) to 73.2% (composite separator). Combining the exceptional electrolyte affinity and well-developed porous structure, the as-prepared ZIF-8@BC composite separator displayed high electrolyte uptake (340.5%) and good electrolyte wettability, which brought about superior ionic conductivity (1.12 mS cm−1) compared to commercial polypropylene separator (0.38 mS cm−1). These synergistic advantages eventually endowed the battery using ZIF-8@BC separator with excellent rate capability and cycling performance. Furthermore, the ZIF-8@BC separator showed suitable mechanical strength and outstanding thermal resistance, which ensured higher safety during battery operation. Accordingly, the ZIF-8@BC composite separator is a promising candidate for next-generation LIBs with both enhanced performance and high safety.

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Metadata
Title
Highly porous zeolitic imidazolate framework-8@bacterial cellulose composite separator with enhanced electrolyte absorption capability for lithium-ion batteries
Authors
Sufeng Zhang
Jin Luo
Min Du
Fengjiao Zhang
Xinning He
Publication date
04-05-2022
Publisher
Springer Netherlands
Published in
Cellulose / Issue 9/2022
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-022-04598-3

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