| abstract |
PROBLEM TO BE SOLVED: To solve the above-mentioned problems observed in a conventional solid electrolyte using a polymer as a matrix, to improve ionic conductivity and uniformity, especially ionic conductivity at low temperature, A solid electrolyte and a electrochemical element using the polymer having a matrix having a solid strength sufficient for use as a solid electrolyte for an element, In particular, provision of non-aqueous secondary batteries. SOLUTION: In a solid polymer electrolyte having a polymer as a matrix, the solid polymer electrolyte is at least the following formula (I): LiXFn (I) (where X is B, P, As, Sb) And n is 4 when X is B, and 6 when P, As, and Sb are present.) And at least a cyclic carbonate and an acyclic carbonate (B). An ion-conductive polymer solid electrolyte, wherein the volume ratio of the cyclic carbonate / acyclic carbonate is less than 1. |