| 摘要 |
A lithium ion secondary battery including: a positive electrode current collector; a positive electrode active material layer that is provided in contact with the positive electrode current collector; a separator layer that is provided on a side of the positive electrode active material layer on which the positive electrode current collector is not provided; a negative electrode active material layer that is provided on a side of the separator layer on which the positive electrode active material layer is not provided, that primarily contains silicon or tin, and that includes a opposing portion opposing the positive electrode active material layer and a non-opposing portion not opposing the positive electrode active material layer, the opposing portion and the non-opposing portion containing lithium produced by a thin film-forming method; and a negative electrode current collector that is provided on a side of the negative electrode active material layer on which the separator layer is not provided. Thereby, deformation of the negative electrode and deterioration in cycle characteristics accompanied by such deformation can be prevented.
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