Importance

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Abstract

A secondary battery includes: a negative electrode including a negative electrode active material layer. The negative electrode active material layer includes a first active material layer having a first active material and a second active material layer having a second active material. A first button battery using lithium plate as a negative electrode and the first active material as a positive active material of a positive electrode experiences a charge and discharge test; a terminal potential slope of a lithium deintercalation curve of the first button battery is Sa; a second button battery using lithium plate as a negative electrode and the second active material as a positive active material of a positive electrode experiences a charge and discharge test; a terminal potential slope of a lithium deintercalation curve of the second button battery is Sb; Sa−1/V≤Sa≤7 mAh·g⁻¹/V, and 5 mAh·g⁻¹/V≤Sb≤14 mAh·g⁻¹/V.

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First Claim