| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery, using a carbon material for a negative electrode, having high capacity, even in rapid charging and discharging, few self-discharging and improved cycle characteristics. SOLUTION: The lithium ion secondary battery comprises a coating layer with its carbon-particle surface, defining at least a portion of the negative electrode contacting a separator and having a carbonate structure containing at least one type of element out of boron, sulfur and nitrogen, the coating layer being controlled to be in the range of 5 nm-200 nm in thickness. |
