TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Property: The tin-containing compound has lithium comparison electric potential of 0.5 V. Preferred Process: The tin-containing compound is obtained by mixing chalcogenide compound or metal oxide with tin alloy-type material and sintering. Preferred Composition: The electrolyte further contains gel polymer obtained by polymerizing solution containing monomer, and polymerization initiator or photoinitiator. Preferred Component: The tin alloy-type material is tin-based amorphous composite oxide containing tin and elements of group 13 or 15. The eutectic mixture is ionizable with amide group-containing compound. The amide group-containing compound is chosen from acetamide, N-ethyl acetamide, urea, methyl urea, caprolactam, N-methyl caprolactam, N-ethyl urethane, valerolactam, trifluoroacetamide, methyl carbamate, N-methyl methylcarbamate, N,N-dimethyl methylcarbamate, ethyl carbamate, and formamide. The monomer is chosen from acrylonitrile, methyl methacrylate, methylacrylate, methacrylonitrile, methyl styrene, vinyl acetate, vinyl chloride, vinylidene chloride, acryl amide, tetrafluoroethylene, ethylene, styrene, methylvinyl ketone and para-cyanostyrene. The polymer is chosen from polymethyacrylate, polyvinylidene difluoride, polyethylene oxide and polyhydroxyethyl methacrylate. Preferred Compound: The tin-containing compound is of formula: SnBaPbAlcSdSeeTefCalMgmOn.a-f,l-n=0-1. EXAMPLE - Tin, barium oxide, phosphorus pentoxide, aluminum oxide, sulfur and calcium oxide were mixed in molar ratio of 5:2:2:2:1:1, fused at 1000 degrees C and cooled, to obtain anode active material. The obtained anode material was mixed with polyvinylidene fluoride, artificial graphite and N-methyl pyrrolidone and coated on aluminum foil, to obtain anode. N,N-dimethyl methylcarbonate (in g) (6) and lithium hexafluorophosphate (3) were mixed at room temperature under nitrogen atmosphere for 12 hours, to obtain electrolyte. The titanium alloy type material, artificial graphite, binder and N-methyl pyrrolidone were mixed and coated on copper foil, to obtain cathode. The obtained anode and cathode were separated by separation film and electrolyte was injected, to obtain secondary battery.