| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery capable of high output without reducing maintenance of the battery service life. <P>SOLUTION: The lithium ion secondary battery has a positive electrode capable of storing and releasing a lithium ion, a negative electrode capable of storing and releasing the lithium ion, a separator arranged between the positive electrode and the negative electrode, and an organic electrolyte. The lithium ion secondary battery is characterized in that the negative electrode includes an ungraphitizable carbon material, and the organic electrolyte includes ring carbonate and chain carbonate as a solvent, and the composition ratio in the solvent of the ring carbonate is 18.0-30.0 vol%, and the composition ratio in the solvent of the chain carbonate is 70.0-82.0 vol%, and halogenated ring carbonate is included as an additive, and the composition ratio to the solvent of the halogenated ring carbonate is 0.4-3.2 wt.%. <P>COPYRIGHT: (C)2010,JPO&INPIT |
