Highly porous cellulose acetate separators for zinc-ion batteries

Le résumé fourni par la source

With the growing interest in aqueous zinc-ion batteries (ZIBs), it is important to address the challenges they face, such as Zn dendrite formation, capacity fade, and side reactions. Many approaches are under development to mitigate these challenges, including design of Zn anodes, Zn regulation through electrolyte additives, and separator fabrication. In this work, a free standing cellulose acetate (CA) separator film was prepared using pore forming agents, as an alternative to traditional separators made from non-woven fibres. The porosity of CA films is adjustable by using different solvents, non-solvents, and plasticisers as pore-forming agents, including water, acetone, and glycerol. Solvents that evaporate at room temperature during wet casting with a doctor blade eliminated the need for further processing. This method resulted in highly porous films with tunable thickness. The CA-3 separator is about 6 times thinner than traditional glass fibre separators (100 µm vs. 600 µm) and can be bent, rolled, or compressed without damage after soaking in the electrolyte, making it a potential alternative separator for ZIBs. Preliminary full cell testing demonstrated their ability to retain almost 70% of the initial capacity after 170 h, although further processing and structural refinement is required to improve the overall capacity.

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