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  Shape-conformable, eco-friendly cellulose aerogels as high-performance battery separators

Raafat, L., Wicklein, B., Majer, G., Jahnke, T., Diem, A. M., Bill, J., et al. (2020). Shape-conformable, eco-friendly cellulose aerogels as high-performance battery separators. ACS Applied Energy Materials, 1-12. doi:10.1021/acsaem.0c02612.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0007-A544-2 Version Permalink: https://hdl.handle.net/21.11116/0000-0007-A545-1
Genre: Journal Article

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 Creators:
Raafat, Leila, Author
Wicklein, Bernd, Author
Majer, Günter, Author
Jahnke, Timotheus1, Author           
Diem, Achim M., Author
Bill, Joachim, Author
Burghard, Zaklina, Author
Affiliations:
1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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Free keywords: separators; batteries; flexible; cellulose; aerogels
 Abstract: The ubiquity of portable electronics underlines the importance of high-performance flexible metal-ion batteries and the necessity of their development. Considering their ecological footprint, the application of eco-friendly recyclable battery components has become the greatest challenge and the focal point of research. However, less attention has been devoted to the development of shape-conformable separators with minimal impact on the battery performance and the environment. It is therefore imperative to develop a rational design of next-generation eco-friendly separators with an optimized structure–performance relationship. In this work, a highly flexible and eco-friendly cellulose-nanofiber aerogel (CNF-AG) separator is developed and its dynamic behavior in battery cells is assessed. The tailored channel-like structure with a meso- and macroporosity of 99.5% and good mechanical stability results in superior performance to the commercial glass fiber (GF) membranes and other cellulose-based separators. Its structure with a well-connected pore network and affinity to carbonate-based and ionic liquid electrolytes realize an electrolyte uptake of 12 000%. Furthermore, an effective diffusion coefficient of 1.70 × 10–10 m2 s–1, only 16% lower than that of the bulk electrolyte, yielded an ionic conductivity of 2.64 mS cm–1. Assessing the CNF-AG in lithium-ion batteries (LIBs) revealed a stable interfacial resistance over time, reaching 380 Ω, one-third of that obtained for GF. Accordingly, superior electrochemical performance is observed, achieving good cycling stability up to 200 cycles. Moreover, its applicability in aluminum-ion batteries is demonstrated. The outstanding structure–performance relationships of the developed CNF-AG indicate its superiority as a shape-conformable biodegradable separator suitable for metal-ion batteries.

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Language(s): eng - English
 Dates: 2020-10-222020-12-162020-12-28
 Publication Status: Published online
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsaem.0c02612
 Degree: -

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Title: ACS Applied Energy Materials
  Abbreviation : ACS Appl. Energy Mater.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 12 Identifier: ISSN: 02574-0962
CoNE: https://pure.mpg.de/cone/journals/resource/2574-0962