A lithium ion secondary battery, which uses a negative electrode wherein an active material is deposited on a collector, and which is characterized in that no wrinkles are formed on the collector, the collector does not fracture, the adhesion between the a...

The material for metal cases of secondary batteries using a non-aqueous electrolyte includes a steel sheet; and a plated layer that has a Ni layer, and a Cu-Ni layer, which is disposed between the Ni layer and the steel sheet and is in contact with the Ni ...