TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The lithium salt is lithium perchlorate (preferred), lithium hexafluoro-phosphate, lithium tetrafluoro-borate, lithium bis(oxalate)-borate, lithium manganate, lithium iron phosphate, lithium nickelate or lithium cobalt oxide. The materials of the anode and the cathode are pure metal lithium or lithium alloy.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The initiator is a photo-initiator (comprising dimethylol propionic acid (preferred), 1-hydroxy-cyclohexyl phenyl ketone or 2-methyl-1-(4-(methylthio)-phenyl)-2-morpholino-propiopheno) or a thermo-initiator (comprising chloride gas, bromine gas, organic peroxide or azo initiator).    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The molecular structure of the interpenetrating polymer network comprises an open circle structure. The molecular weight of the first monomer or the second monomer is 200-600. The first monomer is preferably polyethylene glycol (200) dimethacrylate, and the second monomer is preferably methoxy polyethylene glycol (350) monoacrylate. The plasticizer is a multi-arm macromolecular material which is a six-arm macromolecule material (preferred) or a four-arm macromolecule material, where the six-arm macromolecule material is synthesized from phloroglucinol, phosphorus oxychloride and methyl polyethylene glycol. The six-arm macromolecule material contains six-arm macromolecules, and a molecular weight of each six-arm macromolecule is 120, 400, 600 or 750. EXAMPLE - Phloroglucinol-acetonitrile solution was dropped into phosphorus oxychloride to form a primary mixture. The primary mixture was stirred to obtain an intermediate solution. Methyl polyethylene glycol-400 (MPEG-400) was dissolved into acetonitrile to form an MPEG-400 acetonitrile solution, and then the MPEG-400 acetonitrile solution was added into the intermediate solution. Then, evaporated solution was removed after 48 hours, to obtain six-arm star macromolecule (SM400). Methoxy polyethylene glycol (350) monoacrylate, polyethylene glycol (200) dimethacrylate, dimethylol propionic acid and SM400 were mixed with lithium perchlorate to form an intermediate mixture, where methoxy polyethylene glycol (350) monoacrylate was 2.5 wt.% of polyethylene glycol (200) dimethacrylate, dimethylol propionic acid was 0.1 wt.% of methoxy polyethylene glycol (350) monoacrylate, and lithium perchlorate was less than or equal to 10 wt.% of methoxy polyethylene glycol (350) monoacrylate. The intermediate mixture was put onto a Teflon (RTM: PTFE) plate in nitrogen gas, and UV light was used with a wavelength of 365 nm to irradiate the mixture for 60 minutes to substantially polymerize methoxy polyethylene glycol (350) monoacrylate with polyethylene glycol (200) dimethacrylate to form the interpenetrating polymer network, thus obtaining a final mixture including the interpenetrating polymer network, lithium perchlorate and SM400. The final mixture was dried for 8 hours at 80 degrees C, to form solid electrolyte.