Multifunctional lithium battery composite diaphragm as well as preparation method and application thereof

The invention relates to the technical field of battery diaphragms, in particular to a multifunctional lithium battery composite diaphragm as well as a preparation method and application thereof. The invention provides a preparation method of a multifunctional lithium battery composite diaphragm, which comprises the following steps: mixing an inorganic nanoparticle dispersion liquid and an aramid nanofiber solution to obtain a composite solution; and carrying out vacuum filtration on the composite solution, and drying to obtain the aramid nanofiber/inorganic nanoparticle composite diaphragm. The multifunctional lithium battery composite diaphragm prepared by the preparation method has uniformly distributed nanopores, is high in mechanical strength and good in thermal stability, and plays a role in preventing lithium dendrites, so that the safety performance of a lithium ion battery is improved. 本发明涉及电池隔膜技术领域，尤其涉及一种多功能锂电池复合隔膜及其制备方法和应用。本发明提供了一种多功能锂电池复合隔膜的制备方法，包括以下步骤：将无机纳米颗粒分散液和芳纶纳米纤维溶液混合，得到复合溶液；将所述复合溶液进行真空抽滤后，进