| abstract |
A secondary battery having high cycle characteristics is provided. The secondary battery includes a positive electrode, a negative electrode, and an electrolyte. In the negative electrode, a negative electrode active material layer containing silicon, carbon, and oxygen as a negative electrode active material is provided on the negative electrode current collector. In the negative electrode active material, the carbon content is 0.2 atomic% or more and 10 atomic% or less, the oxygen content is 0.5 atomic% or more and 40 atomic% or less, and 0.1% or more and 17.29% or less of silicon contained in the negative electrode active material is Si-. It exists as a C bond. |