NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Japanese Patent JP2022081902

A

To reduce capacity deterioration during storage.SOLUTION: A negative electrode active material layer includes a facing region and a non-facing region. The facing region faces a positive electrode active material layer. The non-facing region does not face the positive electrode active material layer. The negative electrode active material layer contains an alloy-based negative electrode active material and graphite. The facing region contains an alloy-based negative electrode active material with a higher mass fraction than the non-facing region. The non-facing region contains graphite in a higher mass fraction than the facing region. In SOC of 80% or more, the facing region and the non-facing region satisfy the relation of the equation (I) "0 V