| 摘要 |
PROBLEM TO BE SOLVED: To obtain high discharge voltage, excellent charge/discharge cycle characteristics, long storage performance, and high productivity by forming a negative electrode and/or a positive electrode with at least two layers, and minimizing the conductor content in the uppermost layer. SOLUTION: In order to reduce the dispersion of lithium insertion/releasing amount on the electrode surface, a negative electrode and/or a positive electrode are/is constituted with at least two layers, and the conductor content in a mix in the uppermost layer is minimized. By slowing the lithium insertion/releasing speed on the uppermost layer compared with the lower layer, the dispersion of the lithium insertion/releasing amount is decreased. The conductor content in the mix in the uppermost layer of the negative electrode is limited to 0.1wt.% or more but 10wt.% or less, and that in the mix in the uppermost layer of the positive electrode is limited to 0.1wt.% or more but 2wt.% or less, and the film thickness the uppermost layers of the positive electrode and the negative electrode both are made 0.5μm or more but 20μm or less in film thickness. High discharge working voltage, high discharge capacity, and conservable properties can be obtained. |
