Abstract:

Utilizing solid state electrolytes instead of traditional liquid electrolytes has been expected to simultaneously solve the polysulfide shuttle, lithium dendrites growth, low thermal stability and other important scientific and technical problems of lithium-sulfur batteries. However, the solid electrolyte has various disadvantages such as low ionic conductivity at room temperature, poor electrolyte/electrode interface compatibility, hindering the commercial development of lithium-sulfur batteries. This article presents a brief review of the researches on the gel polymer electrolyte, all solid polymer electrolyte and composite electrolyte for solid state lithium-sulfur batteries. At the same time, combining with theoretical models and micro-mechanism, this review illustrates the mechanism of lithium ionic conductivity in the solid polymer electrolyte, the inhibition of polysulfide shuttle and dendrite growth by the solid electrolyte in detail. The problems and future development of solid polymer electrolyte in lithium-sulfur batteries are also systematically summarized and outlooked.