Non-aqueous secondary battery

A non-aqueous secondary battery, comprising:

• a positive electrode;
• a negative electrode;
• an insulating layer that is a single layer contacting the positive electrode on one side and contacting the negative electrode on another side, the insulating layer comprising a polyvinylidene fluoride type resin and inorganic particles, the polyvinylidene fluoride type resin comprising, as polymerizing components, vinylidene fluoride and a monomer represented by the following formula (1);
• and
• an electrolyte,
• wherein a content ratio of the polyvinylidene fluoride type resin in the insulating layer is 100% by mass based on a total amount of all resins contained in the insulating layer, and
• wherein a thickness of the insulating layer is from 10 μm to 30 μm:
• wherein, in Formula (1), each of R1, R2, and R3 independently represents a hydrogen atom, a halogen atom, a C1-5 alkyl group, a carboxyl group or a derivative of a carboxyl group;
• X represents a single bond, a C1-5 alkylene group, or a substituted C1-5 alkylene group;
• and Y represents a hydrogen atom, a C1-5 alkyl group, a C1-5 alkyl group that contains at least one hydroxy group, a C1-5 alkyl group that contains at least one carboxyl group, or —R—O—C(═O)—(CH2)n—C(═O)—OH, wherein R represents a C1-5 alkylene group and n represents an integer of 0 or more.

A non-aqueous secondary battery, comprising:

• a positive electrode;
• a negative electrode;
• an insulating layer that is a single layer contacting the positive electrode on one side and contacting the negative electrode on another side, the insulating layer comprising a polyvinylidene fluoride type resin and inorganic particles;
• and
• an electrolyte,
• wherein a weight-average molecular weight of the polyvinylidene fluoride type resin contained in the insulating layer is from 900,000 to 1,500,000,
• wherein a content ratio of the polyvinylidene fluoride type resin in the insulating layer is 100% by mass based on a total amount of all resins contained in the insulating layer,
• wherein the polyvinylidene fluoride type resin is a VDF-HFP binary copolymer,
• wherein a thickness of the insulating layer is from 5 μm to 30 μm, and
• wherein the inorganic particles include metal sulfate particles.