| CPC H01M 50/449 (2021.01) [H01M 10/052 (2013.01); H01M 50/443 (2021.01); H01M 50/463 (2021.01)] | 13 Claims |
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1. A separator, comprising:
a resin substrate;
a first heat-resistant layer covering the whole of a first surface of the resin substrate; and
a second heat-resistant layer covering part of a second surface of the resin substrate, wherein
the second surface of the resin substrate consists of:
a covered region covered with the second heat-resistant layer, and
a non-covered region not covered with the second heat-resistant layer,
the second surface in plan view has a rectangular shape defined by four edges including a pair of opposed lateral edges and a pair of opposed longitudinal edges,
the first heat-resistant layer and the second heat-resistant layer each include inorganic particles and a binder, a content of the inorganic particles in each heat-resistant layer is 50 mass % to 90 mass %, and a content of the binder in each heat-resistant layer is 10 mass % to 50 mass %,
the non-covered region is in communication with an edge of the resin substrate,
the non-covered region includes a plurality of lateral non-covered regions each extending from one lateral edge to the other lateral edge of the pair of opposed longitudinal edges of the resin substrate, wherein the plurality of lateral non-covered regions are arranged at predetermined intervals in a longitudinal direction of the resin substrate, and
the covered region coincides with at least part of each of the four edges of the second surface.
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