| 摘要 |
PURPOSE:To prevent deterioration of storage performance of a battery by using solvent including specific asymmetric and acyclic sulfone in the battery provided with a negative and a positive electrode, and nonaqueous electrolyte mainly comprising the solvent and solute. CONSTITUTION:A battery comprises a separator of polypropylene in which organic electrolyte is impregnated, held by a positive electrode 6 mainly comprising lithium-cobalt composite oxide and a negative electrode 3 mainly comprising graphite, which are closed and sealed by a case 1 of stainless also acting as a positive electrode terminal and a sealing plate 2 of stainless also acting as a negative electrode terminal through a gasket 4. The electrolyte comprises solute such as lithium phosphate hexafluoride dissolved by solvent including asymmetric and acyclic sulfon expressed by a formula of ethylene carbonate, diethyl sulfone, etc., where in the formula, R is an alkyl group selected among ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, and t-butyl. |
