TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The particle comprises an inorganic particle, metal oxide, aluminum oxide, a boehmite, calcined kaolin, a titanium oxide, a zinc oxide, and magnesium oxide. The positive electrode comprises a lithium containing compound as the positive electrode active material. The negative electrode comprises metallic lithium, a carbon material, material comprising lithium and element with possibility of alloy formation and material comprising a lithium containing compound as the negative electrode active material. Preferred Composition: The concentration of the particle is 5-10 mass%. Preferred Properties: The particle has average primary particle diameter of 10 nm-10 micrometers.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The low molecular gelatinizer comprises compound of formula (Rf1-R1-X1-L1-R2) and (Rf1-R1-X1-L1-R3-L2-X2-R4-Rf2). The electrolyte solution is phase transition type gel electrolyte solution, and in the form of gel in cold condition and sol in high temperature state.Rf1, Rf2=2-20C perfluoroalkyl;R1, R4=1-6C bivalent saturated hydrocarbon group of single bond;X1, X2= bivalent functional group comprising -O-, -S-, -S(=O)-,-S(=O)(=O)-, -C(=O)-O-, -O-C(=O)-N(-H)- or -O-C(=O)-N(-H)-;L1, L2= oxyalkylene, which may be substituted by single bond, alkylor halo, oxycycloalkylene, which may be substituted by alkyl or halo or bivalent oxy aromatic group, which may be substituted by alkyl or halo;R2=1-20C alkyl,, which may be substituted by alkyl or halo (except a fluorine atom), fluoroalkyl, which may be substituted by alkyl or halo (except a fluorine atom), an aryl, a fluoro aryl, monovalent group or bivalent group corresponding to groups bonded;andR3= 1-18C bivalent saturated hydrocarbon group, which may be substituted by an alkyl and have oxygen or sulfur atoms in a main chain.Preferred Process: The electrolyte solution is prepared by cooling mixed solution after heating the mixed solution comprising non-aqueous solvent, electrolyte, particle and a low molecular gelatinizer to produce uniform sol solution. Preferred Properties: The phase transition temperature of the gel and sol is 50-150 degrees C.