NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Provided is a non-aqueous secondary battery that uses a polyanion compound or a lithium nickel oxide as a positive electrode active material and wherein a small internal resistance and a high electric capacity can be maintained even after high-temperature storage or charge and discharge at high temperatures, by suppressing elution of metal and other transition metal compounds from the polyanion compound and reducing binder deterioration by the residual alkaline component. Specifically provided is a non-aqueous electrolyte secondary battery with: a negative electrode capable of intercalating and deintercalating lithium ions; a positive electrode with a lithium-containing compound as the positive electrode active material; and a non-aqueous electrolyte that has lithium salt dissolved in an organic solvent. Said non-aqueous electrolyte secondary battery is characterized by the lithium-containing compound being a polyanion compound or a lithium nickel oxide and by the non-aqueous electrolyte containing a fluorosilane compound indicated by general formula (1). (In the formula, R1 to R3 independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and aryl group having 6 to 8 carbon atoms, or a fluorine atom, and R4 represents an alkylene group having 1 to 8 carbon atoms or an alkylene group having 4 to 8 carbon atoms and having an ether group.)