| 摘要 |
The purpose of the present invention is to provide a lithium ion cell that has excellent charge-discharge cycle properties in spite of using a conventional lithium ion cell electrolyte solution. This lithium ion cell is provided, inside a cell outer casing, with the following: a positive electrode containing a spinel-type lithium-nickel-manganese composite oxide as the positive electrode active substance; a negative electrode containing a negative electrode active substance capable of absorbing lithium ions; a separator for insulating the positive electrode and the negative electrode; and an electrolyte solution. The ratio (Y/X) of the volume Y occupied by the electrolyte solution to the volume X inside the cell outer casing is 0.2 or greater. |
