Patent ID: 11949097
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode;
a negative electrode; and
a separator interposed between the positive electrode and the negative electrode,
a mixture layer density of the positive electrode being 3.6 g/cc or more, wherein
the separator includes:
a porous base material;
a first filler layer including phosphate particles having a BET specific surface area of 5 m2/g or more and 100 m2/g or less and polyvinylidene fluoride and formed on a first surface of the base material facing a side of the positive electrode and being in contact with the positive electrode; and
a second filler layer including inorganic particles having a melting point higher than that of the phosphate particles and formed at least one of on a second surface of the base material facing a side of the negative electrode and between the base material and the first filler layer, wherein
a content of polyvinylidene fluoride included in the first filler layer is 10% by mass or more and 50% by mass or less, and is higher in a region on the positive electrode side than in a region on the base material side,
in the first filler layer, a content of the phosphate particles is at least 50% by mass based on a total mass of the first filler layer, and
in the second filler layer, a content of the inorganic particles having a melting point higher than that of the phosphate particles is 90% by mass or more based on a total mass of the second filler layer.