This invention relates to an electrolyte based on ZnI2 with the following formula: ZnI2(L)n+mM+wI2+xG+yCP+zA, in which, ligand L is an organic material coordinated with ZnI2 in following number: 0<=n<=6, the solvent M includes amine, mellow, acid nitrile, aether and ester organic solvents and their mixtures or ionic solution, the mol ratio of which to the ZnI2 is 0<=m<=2000, the mol ratio of I simple substance to ZnI2 is 0<=w<=0.5, the gel G is an organic compound of small molecules or an organic compound of high molecules and the mol ratio of which to the ZnI2 is 0<=x<=1 and that of ceramic powder to ZnI2 is 0<=y<=5 and additive A is a compound capable of improving performance of electrolyte and the ratio to the ZnI2 is 0<=z<=2. |