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This study concerns the development of a well‐defined synthetic route to obtain lignin‐derived multifunctional graft polymers by simple chemical modification and atom‐transfer radical polymerization. By grafting ion‐conducting and cross‐linkable moieties onto the lignin, star‐shaped functional polymers are prepared. Upon cross‐linking under ultraviolet light irradiation, the resulting polymer network exhibits mechanical stability even at high temperature, whereas the chain mobility is maintained despite the cross‐linked structure. Their use as solid polymer electrolytes (SPEs) and binders for all‐solid‐state lithium metal batteries (LMBs) is also evaluated. The lignin‐derived graft polymers provide a facile ion conduction pathway and also efficiently suppress lithium dendrite growth during cycling, thereby attaining excellent cycling performance for the LMB cell compared to that with a conventional liquid electrolyte–Celgard system.

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A cross-linked graphene oxide (GO) membrane was fabricated by a simple vacuum filtration, which was followed by a thermal treatment to functionalize GO with renewable cardanol (cardanol-GO). The cardanol-GO was fabricated through reactions between epoxy groups on the GO surface and phenolic moieties of cardanol with the participation of a catalyst. The prepared cardanol-GO membrane was then heated to form a cross-linked structure by reactions between the double bonds of cardanol. The crosslinked GO membrane exhibited outstanding dimensional stability and oil/water separation efficiency. Furthermore, the cross-linked cardanol-GO membrane was proved to contain a marked antibacterial property against Escherichia coli that originates from the cardanol moieties.

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