Non-aqueous electrolyte secondary battery

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

• a resin separator component comprising a two-layer structure consisting of
• a porous polyethylene layer mainly composed of polyethylene, and
• a porous polymer layer mainly composed of a polymer having higher oxidation resistance than that of the polyethylene;
• and
• an inorganic filler layer comprising an inorganic filler and a binder, formed on and directly bound with, via the binder, a surface of the polyethylene layer being not provided with the porous polymer layer, wherein
• the inorganic filler is metal oxides having a high melting point of 1000° C. or higher, and
• the proportion of the inorganic filler is 90 mass % or more and 99 mass % or less with respect to the whole inorganic filler layer.

A non-aqueous electrolyte secondary battery comprising:

• a positive electrode;
• a negative electrode;
• and
• an inorganic filler layer-containing separator interposed between the positive electrode and the negative electrode, wherein
• the inorganic filler layer-containing separator comprises the separator according to claim 1.