NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

The present invention provides a non-aqueous electrolyte secondary battery using a polyanion compound or a lithium nickelate as a positive electrode active material, which can maintain a small internal resistance and a high electric capacity even after undergoing storage at a high temperature or charging and discharging at a high temperature, by suppressing the elution of a transition metal such as iron from the polyanion compound or by ameliorating the deterioration of a binder by a residual alkali component, and specifically provides a non-aqueous electrolyte secondary battery having a negative electrode that is capable of intercalating and deintercalating lithium ions, a positive electrode containing a lithium-containing compound as a positive electrode active material, and a non-aqueous electrolyte in which a lithium salt is dissolved in an organic solvent, wherein the lithium-containing compound is a polyanion compound or a lithium nickelate, and the non-aqueous electrolyte contains a fluorosilane compound represented by the following general formula (1): wherein R 1 to R 3 each independently represent an alkyl group having 1 to 8 carbon(s), an alkenyl group having 2 to 8 carbons, a cycloalkyl group having 5 to 8 carbons, an aryl group having 6 to 8 carbons or a fluorine atom, and R 4 represents an alkylene group having 1 to 8 carbon(s) or an alkylene group having 4 to 8 carbons having an ether group.