Patent ID: 11942645
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 6:
7. A non-aqueous electrolyte secondary battery comprising: a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode,
wherein the separator has a multilayer structure including a porous resin substrate, a first filler layer containing phosphate particles, and a second filler layer containing inorganic particles having higher heat resistance than the phosphate particles,
the second filler layer is disposed on the porous resin substrate,
the first filler layer is disposed on the porous resin substrate or the second filler layer in such a manner that a surface of the first filler layer faces a surface of the negative electrode,
the phosphate particles have a BET specific surface area in a range of 5 m2/g or more to 100 m2/g or less,
wherein a porosity of the porous resin substrate is in a range of 30% or more to 70% or less,
wherein a thickness of the porous resin substrate is in a range of 3 μm or more to 20 μm or less,
wherein the first filler layer comprises a continuous layer configured to cover an entirety of a surface of the porous resin substrate or the second filler layer on which the first filler layer is disposed,
wherein the phosphate particles are configured to melt and flow into pores of the porous resin substrate and simultaneously to undergo polycondensation to form a coating film of a phosphate polycondensation product on the negative electrode in response to an exothermic reaction on a surface of the negative electrode, and
wherein a porosity of the first filler layer is 30% or more and 70% or less.