Patent ID: 11888121
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A secondary battery, comprising:
a positive electrode;
a negative electrode;
a separator layer comprising a first porous layer containing a solid electrolyte, and a second porous layer in contact with a first surface of the first porous layer and containing fibers, the separator layer being positioned between the positive electrode and the negative electrode, a second surface of the first porous layer parallel to the first surface being in contact with the positive electrode; and
a nonaqueous electrolytic solution comprising a first solvent including at least one of methyl propionate and ethyl propionate, and a second solvent different from the first solvent,
the first porous layer having a void fraction of 10% by volume or greater and 50% by volume or less, and the second porous layer having a void fraction greater than the void fraction of the first porous layer, the void fraction of the second porous layer being 50% by volume or greater and 80% by volume or less.