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|1. (WO2018123085) NONAQUEOUS ELECTROLYTE SECONDARY BATTERY|
|Applicants:||MAXELL HOLDINGS, LTD.
|Title:||NONAQUEOUS ELECTROLYTE SECONDARY BATTERY|
A nonaqueous electrolyte secondary battery is provided which can be used in high temperature conditions and which can maintain excellent reliability even when held at a high temperature over a long period of time. This nonaqueous electrolyte secondary battery is characterized by being provided with a negative electrode, a positive electrode, a separator, and a nonaqueous electrolyte. The negative electrode contains Li or a Li alloy, and, as the separator, has a porous film made from a resin with a melting point or thermal decomposition temperature greater than or equal to 200°C. The nonaqueous electrolyte contains a boric acid compound or a phosphoric acid compound having a group represented in general formula (1). (In general formula (1), X is Si, Ge or Sn, R1, R2 and R3 each independently represents an alkyl group of 1-10 carbons, an alkenyl group of 2-10 carbons, or an aryl group of 6-10 carbons, and all or part of the hydrogen atoms may be substituted with fluorine.)