Separator for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A separator for a non-aqueous electrolyte secondary battery comprising:

• a separator substrate;
• and an aggregate of filler particles that is present in a dot shape on a surface of the separator substrate,
• wherein the filler particles comprise at least one of compound particles containing at least one of silicon, boron, and bromine;
• melamine polyphosphate;
• ammonium polyphosphate;
• lithium metaphosphate;
• sodium carbonate;
• melamine cyanurate;
• melamine pyrophosphate;
• ethylene dimelamine;
• trimethylene dimelamine;
• tetramethylene dimelamine;
• hexamethylene dimelamine;
• 1,3-hexylene dimelamine;
• potassium pyrosulfate;
• potassium citrate monohydrate;
• potassium carbonate, and a transformation point of the filler particles at which the filler particles are transformed from a solid phase into a liquid phase or is thermally decomposed is in a range of 180° C. to 1,000° C.;
• and
• wherein the separator substrate includes a porous substrate, and a heat-resistant layer provided on the porous substrate,
• the heat-resistant layer contains inorganic particles, and
• the inorganic particles contain at least one of alumina, boehmite, and titania.