BATTERY, BATTERY SEPARATOR AND METHOD FOR PRODUCING BATTERY SEPARATOR

摘要

A battery includes a positive electrode, a negative electrode, a separator interposed therebetween, and an electrolyte. The separator includes a plurality of nanofibers and has a form of a sheet having a first surface and a second surface opposite thereto. When the average maximum fiber diameter of the nanofibers in the plane direction of the separator is compared between in vicinities of the first and second surfaces and at a center portion in the thickness direction of the separator, average maximum fiber diameters Ds1 and Ds2 of the nanofibers in the vicinity of the first and second surfaces are smaller than an average maximum fiber diameter Dc of the nanofibers at the center portion in the thickness direction of the separator.

主权项

1. A nanofiber sheet comprising a plurality of nanofibers and having a form of a sheet having a first surface and a second surface opposite to the first surface, and
when an average maximum fiber diameter of the plurality of nanofibers in a plane direction of the nanofiber sheet is compared between in vicinities of the first surface and the second surface and at a center portion in a thickness direction of the nanofiber sheet, an average maximum fiber diameter Ds1 of the plurality of nanofibers in the vicinity of the first surface and an average maximum fiber diameter Ds2 of the plurality of nanofibers in the vicinity of the second surface being smaller than an average maximum fiber diameter Dc of the plurality of nanofibers at the center portion in the thickness direction of the nanofiber sheet.