Flexible solid electrolyte membrane free of synthetic polymer and preparation method and application of flexible solid electrolyte membrane

The invention discloses a flexible solid electrolyte membrane free of a synthetic polymer and a preparation method and application of the flexible solid electrolyte membrane. The flexible solid electrolyte membrane comprises powder of a solid electrolyte and nanocellulose, wherein the nanocellulose is obtained by oxidizing cellulose through TEMPO and carrying out mechanical impact processing on renewable fiber as a raw material. Elastic and gap structures are provided through the nanocellulose, the internal space structure of the flexible solid electrolyte membrane is improved, and relativelyhigh brittleness and relatively low elasticity of a ceramic solid electrolyte are avoided, so that the safety performance of a lithium-ion power battery is improved. 种无合成聚合物柔性固体电解质膜和其制备方法及其应用，包含有固体电解质的粉末和以可再生纤维为原料经过TEＭPO氧化纤维素和机械撞击处理得到的纳米纤维素，通过纳米纤维素提供弹性及空隙结构，改善了柔性固体电解质膜的内部空间结构，避免了陶瓷固体电解质的脆性较高和弹性较低，因此提高了锂离子动力电池的安全性能。