Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery comprising:

• an electrode group including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, the positive electrode, the negative electrode, and the separator being wound together;
• and a non-aqueous electrolyte, and
• having a volume energy density of 650 Wh/L or more,
• the positive electrode including a positive electrode current collector, and a positive electrode material mixture layer adhering to a surface of the positive electrode current collector;
• the negative electrode including a negative electrode current collector, and a negative electrode material mixture layer adhering to a surface of the negative electrode current collector;
• the positive electrode material mixture layer having a porosity Pp of 22% or less, and the negative electrode material mixture layer having a porosity Pn of 25% or less;
• a ratio VE/VT of a volume VE of the non-aqueous electrolyte to a total VT of a pore volume of the positive electrode material mixture layer, a pore volume of the negative electrode material mixture layer, and a pore volume of the separator being 1 or more and 1.5 or less;
• and
• a difference between a contact angle CAp of the positive electrode and a contact angle CAn of the negative electrode with respect to the non-aqueous electrolyte being 23° or less.