Lithium-ion battery separators based on sustainable collagen and chitosan hybrid membranes

Le résumé fourni par la source

This work focuses on the production of sustainable membranes based on collagen and chitosan as separators in lithium-ion batteries. Membranes were prepared by freeze-drying with varying collagen and chitosan contents. All membranes show interconnected pores with different pore sizes and porosity above 90 %, allowing high values of electrolyte uptake. As for thermal and mechanical characteristics, the addition of chitosan improves both thermal and mechanical stability. After 1 M LiPF 6 in EC:DMC electrolyte uptake, the ionic conductivity is above 0.49 mS·cm -1 for all membranes and is most affected by the collagen content. Furthermore, the membranes present a lithium transfer number value of 0.2. In cathodic half-cells with LiFePO 4 , the obtained room temperature discharge capacity is above 140 mAh·g -1 at C/8 rate. For high C rates (C and 2C rates), the membranes with 80 wt % of collagen and 20 wt % of chitosan present 42 mAh·g -1 after 100 cycles at C rate, demonstrating adequate reversibility. Considering the need for more environmentally friendly materials and methods compatible with a circular economy, the bio-based membranes developed in this work constitute an alternative for synthetic separators.

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