| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inexpensive nonaqueous electrolyte secondary battery with excellent charge-discharge characteristics, especially cycle characteristics, and little swelling of the battery due to high-temperature standing or a cycle. <P>SOLUTION: In this nonaqueous electrolyte secondary battery, a negative electrode active material is provided with a composite carbon material in which surfaces of carbonaceous particles used as a core are covered with amorphous carbon, vinylene carbonate (VC) is contained in a solvent of a nonaqueous electrolyte, and an additional amount of vinylene carbonate (VC) is ≥ 0.01 and ≤10.0 mass % of the mass of the solvent. Thereby, a new effect that the swelling of the battery after high-temperature standing or the cycle, which is a problem when VC is added, is controlled is obtained, and the nonaqueous electrolyte secondary battery with excellent charge-discharge characteristics and cycle characteristics can be provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
