Abstract:In recent years, there are many explosion accidents of portable electronic devices, which are mainly due to the electrolyte leakage of the separator/electrolyte system of traditional lithium-ion batteries and severe heat shrinkage of the separator resulting in short-circuiting between positive and negative electrodes. The appearance of cross-linked gel polymer electrolytes has greatly solved the problem of electrolyte leakage. At the same time, the cross-linked network has given the polymer matrix excellent dimensional stability and greatly improved its safety performance. Therefore, it has received extensive attention from researchers. In this paper, cross-linked gel polymer electrolytes prepared by thermal initiation, photoinitiation, radiation initiation, epoxy ring-opening addition, and sol-gel methods are reviewed according to their initiating and preparing methods, meanwhile their mechanical properties and electrical chemical properties are also introduced.