NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

In a non-aqueous electrolyte secondary battery according to the present disclosure, a positive electrode comprises a lithium-containing composite oxide, and a sulfonic acid compound, and a negative electrode mixture layer of a negative electrode includes first graphite particles having an internal porosity of at most 5% and second graphite particles having an internal porosity of 8% to 20%. A thickness T of a first negative electrode mixture layer and a thickness T2 of a second negative electrode mixture layer satisfy 0.1≤TI/(T+T)≤0.9, and a ratio CI of the first graphite particles to the total mass in the first negative electrode mixture layer, and a ratio C of the first graphite particles to the total mass in the second negative electrode mixture layer satisfy C