TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compounds: The positive electrode contains a lithium composite oxide of formula Li~aMnxM1yM2zO2.M1=Co and/or Ni;M2=Co, Ni, Al, B, Fe, Mg, and/or Cr;x=0.2-0.6;y=0.2-0.4;z=0.05-0.4;x+y+z=1;alpha =greater than 0 to less than 1.2.The negative electrode contains carbonaceous materials, oxides containing group IV elements, and/or nitrides containing group IV elements.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The compound (I) is alkoxysilane (preferably trimethylethoxysilane, dimethyldiethoxysilane, methyltrimethoxysilane, and/or dimethyldimethoxysilane). The compound having the polymerizable group is a compound of formula (II), or a compound of formula Z1-O-C(=O)-O-Z2 (III). The halogen compound is fluoroethylene carbonate. The electrolyte further contains a cyclic carbonate of formula (IV), and a linear carbonate of formula R5-O-C(=O)-O-R6 (V).Z1 and Z2=vinyl, acryl, or methacryl;R1 to R8=H, F, Cl, 1-3C alkyl, or fluorinated 1-3C alkyl.The compound (IV) is ethylene carbonate, the compound formula (V) is ethyl methyl carbonate and/or dimethyl carbonate, the compound (II) is vinylene carbonate, and the compound (III) is dimethacryl carbonate. Preferred Electrolyte: The compositional ratio of the compound (IV) is (18-30 vol.%), the compound (V) is (74-81.8 vol.%), the compound (II) is (0.1-1.0 vol.%), the compound (III) is (0.1-1 vol.%), the alkoxysilane is (0.1-1.0 vol.%), and the compound containing the halogen is (0.1-1.0 vol.%), under assumption that the total volume for the compounds (II) to (V), the alkoxysilane, and the compound having the halogen is (100 vol.%). The electrolyte essentially consists of the compounds (II) to (V), the alkoxysilane, and the compound having halogen. EXAMPLE - A test lithium ion secondary battery in the form of a wound battery of was formed as follows. A positive electrode material paste was at first prepared by using LiMn1/3Ni1/3CO1/3O2 as a positive electrode active material, carbon black (CB1) and graphite (GF2) as an electronic conductive material, and polyvinylidene fluoride (PVDF) as a binder, and using NMP (N-methylpyrrolidone) as a solvent such that the solid content weight in a dried state was at a ratio of LiMn1/3Ni1/3CO1/3O2:carbon black (CB1):graphite (GF2):polyvinylidene fluoride (PVDF) of 86:9:2:3. The positive electrode material paste was coated over an aluminum foil as positive electrode current collector, dried at 80 degrees c, pressed by pressing roller, and dried at 120 degrees C to form a positive electrode mix layer to positive electrode current collector. Then, negative electrode material paste was prepared by using a pseudo anisotropic carbon which was amorphous carbon as negative electrode active material, carbon black (CB2) as a conductive material, and PVDF as a binder, and using NMP as a solvent such that the solid content weight in a dried state was at a ratio of pseudo anisotropic carbon:CB2:PVDF of 88:5:7. The negative electrode material paste was coated over a copper foil as negative electrode current collector, dried at 80 degrees C, pressed by pressing roller, and dried at 120 degrees C to form negative electrode mix layer to the negative electrode current collector. An electrolyte was prepared by using solvents mixed at a volumic compositional ratio of dimethoxydimethyl silane (DDS):fluoroethylene carbonate (FEC):ethylene carbonate (EC):dimethyl carbonate (DMC):ethyl methyl carbonate (EMC) of 0.5:0.5:20:39.5:39.5 as the electrolyte and dissolving 1 M of LiPF6 as a lithium salt. A separator was sandwiched between the thus prepared electrodes to form a wound group and inserted in a negative electrode battery can. Then, for current collection to the negative electrode, one end of a negative electrode lead made of nickel was welded to the negative electrode current collector and the other end was welded to the negative electrode battery can. Further, for current collection to the positive electrode, one end of a positive electrode lead made of aluminum was welded to the positive electrode current collector, and the other end was welded to a current shut-off valve and further electrically connected by way of the current shut-off valve with a positive electrode battery lid. A wound battery was manufactured by further injecting a liquid electrolyte and caulking the same. The lithium secondary battery was then evaluated as follows. The capacity retention ratio of the wound battery shown during storage at 50 degrees C was evaluated. At 25 degrees C, a battery was charged to 4.1 V at a constant current of 0.7 A, charged till the current value reached 20 mA at a constant voltage of 4.1 V, after operation recessed for 30 minutes, discharged to 2.7 V at 0.7 A, and the discharge capacity was evaluated. The operations were repeated three times, and the discharge capacity at the third cycle was defined as an initial discharge capacity. Then, at 25 degrees C, the battery was charged to 4.1 V at a constant current of 0.7 A, and charged till the current value reached 20 mA at a constant voltage of 4.1 V. The charged battery was stored in a thermostatic bath at 50 degrees C and the discharge capacity was evaluated at 60th day. At 25 degrees C, the battery was charged to 4.1 V at a constant current of 0.7 A, charged till the current value reached 20 mA at a constant voltage of 4.1 V, after operation recessed for 30 minutes, discharged to 2.7 V at 0.7 A, and the discharge capacity was evaluated. A comparative lithium ion secondary battery in the form of a wound battery was manufactured similarly as the test battery except for using an electrolyte formed by mixing solvents at a volumic compositional ratio of DDS:EC:DMC:EMC of 1:20:39.5:39.5, and dissolving 1 M of LiPF6 as a lithium salt, and the capacity retention ratio was evaluated. The capacity retention ratio after lapse of 60 days (%) for the test/comparative battery was found to be 94/86.