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Abstract

A method for preparing a composite solid electrolyte with a soft filler is provided. The soft filler is obtained by converting nanocellulose particles into lithiated cellulose, and it is a transparent cement-like composite material, and has lithium ion transfer and anion molecular sieve functions. The composite solid electrolyte is obtained by mixing a solvent, a polymer, a lithium salt and a lithiated cellulose. The lithiated cellulose has numerous oxygen-containing groups, and opens up a new transmission path of lithium ions in the composite solid electrolyte. Meanwhile, the lithiated cellulose can limit disordered movement of lithium salt anions, so that the transportation efficiency of lithium ions is improved. Researches find that lithiated cellulose strengthens various physical and chemical properties of the composite solid electrolyte. The composite solid electrolyte prepared by the method has the advantages of simple process, easily available raw materials, safety, no pollution and suitability for large-scale production.

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