POSITIVE ELECTRODE FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Disclosed is a positive electrode for a non-aqueous electrolyte secondary battery, including a current collector and a mixture layer attached thereto. The mixture layer includes an active material including particles of a first active material, i.e., a lithium-manganese composite oxide, and particles of a second active material, i.e., a lithium-nickel composite oxide. A proportion of the first active material particles in the active material is 51 vol % to 90 vol %. A volume-based particle size distribution of the first active material particles has a first peak on a larger particle side and a second peak on a smaller particle side. A first particle size D1 corresponding to the first peak is 2.5 to 5 times larger than a second particle size D2 corresponding to the second peak. A volume-based particle size distribution of the second active material particles has a third peak corresponding to a third particle size D3 satisfying D1>D3>D2.

主权项

1. A positive electrode for a non-aqueous electrolyte secondary battery, the positive electrode comprising: a positive electrode current collector; and a positive electrode mixture layer attached to the positive electrode current collector,
the positive electrode mixture layer comprising a positive electrode active material including first active material particles and second active material particles, the first active material being a lithium-manganese composite oxide, the second active material being a lithium-nickel composite oxide, a proportion of the first active material particles included in the positive electrode active material being 51 vol % to 90 vol %, and a volume-based particle size distribution of the first active material particles having a first peak on a larger particle side and a second peak on a smaller particle side, a first particle size D1 corresponding to the first peak on the larger particle side being 2.5 to 5 times larger than a second particle size D2 corresponding to the second peak on the smaller particle side, and a volume-based particle size distribution of the second active material particles having a third peak corresponding to a third particle size D3 satisfying D1>D3>D2.