NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

A nonaqueous electrolyte secondary battery includes a fiber layer, which contains fiber composed of a synthetic resin, between a separator and a positive electrode and/or between the separator and a negative electrode. The fiber layer contains at least PVDF and PTFE as components of the synthetic resin configuring the fiber. The PVDF and the PTFE both have an average molecular weight of equal to or greater than 200,000 and equal to or less than 2,000,000. In the components of the synthetic resin configuring the fiber, the content of PVDF is greater than the content of PTFE, and the content of PTFE is equal to or less than 45% by mass with respect to the total amount of the components of the synthetic resin.

主权项

1. A nonaqueous electrolyte secondary battery, comprising:
a flat roll electrode unit in which an elongate positive electrode, an elongate negative electrode, an elongate separator that electrically separates the positive and negative electrodes from each other, and a fiber layer that is disposed at least between the separator and the positive electrode or between the separator and the negative electrode and contains fiber composed of synthetic resin components are superimposed on each other and wound up together in a longitudinal direction; and a nonaqueous electrolyte, wherein the fiber layer contains at least polyvinylidene fluoride and polytetrafluoroethylene as the synthetic resin components configuring the fiber, the polyvinylidene fluoride and the polytetrafluoroethylene both have an average molecular weight of equal to or greater than 200,000 and equal to or less than 2,000,000, and in the synthetic resin components configuring the fiber, a content of the polyvinylidene fluoride is greater than a content of the polytetrafluoroethylene, and the content of the polytetrafluoroethylene is equal to or less than 45% by mass with respect to a total amount of the synthetic resin components.