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Zwitterionic cellulosic membrane as a new separator with enhanced ionic conductivity and performance for lithium-ion batteries

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Abstract   

Separators are regarded as an essential component of lithium-ion batteries (LIBs) due to their critical roles in the electrochemical performance and safety of these batteries. The purpose of this study was to examine the structural and electrochemical properties of a new separator based on zwitterionic cellulose (Cell). The free radical polymerization method was used to graft 4-vinyl pyridinium propane sulfonate (4-VPPS) onto the hydroxyl groups of Cell, and the polymer solution in trifluoroacetic acid (TFA) solvent was prepared to form a thin membrane using an automatic film applicator. The results showed that the modified Cell (MCell) separator had significantly higher tensile strength and elastic modulus, as well as superior thermal and dimensional stability, when compared to control separators (polypropylene (PP) at transverse direction and unmodified Cell). The improved separator material effectively reduced the growth of lithium dendrites, which cause short circuits and battery failure. Furthermore, the zwitterionic Cell separator demonstrated improved cycling stability and rate capability. Overall, this study suggests that using MCell separators with 4-VPPS is a promising alternative for improving LIB performance. The findings help to advance battery technology by increasing safety, efficiency, and overall battery life.

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Funding

The authors would like to acknowledge funding from Shiraz University (No. 99GCB1M256440).

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Contributions

M. Asadnia: Conceptualization, Methodology, Software, Validation, Investigation, Writing—Original Draft, Data Curation. M. Sadat-Shojai: Conceptualization, Writing—Review & Editing, Supervision, Funding acquisition. M. Moslehi: Writing—Review & Editing, Project administration, Funding acquisition. F. Hamidi: Software, Validation, Data Curation.

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Correspondence to Mehdi Sadat-Shojai or Mohsen Moslehi.

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This study was conducted following Compliance with Ethical Standards, and it did not involve human participants, animals, and potential conflicts of interest.

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The authors declare no competing interests.

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Asadnia, M., Sadat-Shojai, M., Moslehi, M. et al. Zwitterionic cellulosic membrane as a new separator with enhanced ionic conductivity and performance for lithium-ion batteries. Cellulose (2024). https://doi.org/10.1007/s10570-024-05903-y

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  • DOI: https://doi.org/10.1007/s10570-024-05903-y

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