| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a lithium-ion secondary battery which can control swelling of a battery due to gas generation in charging and also can improve charge/discharge cycle characteristics of the battery. <P>SOLUTION: The manufacturing method of a lithium-ion secondary battery includes the following processes; at least two electrolyte solution pouring processes of pouring nonaqueous electrolyte solution inside a battery precursor through an electrolyte pouring port fixed on a battery can or a battery cover, a process of sealing the electrolyte pouring port after the last electrolyte solution pouring process, and at least one charging process after the first electrolyte solution pouring process and before the last electrolyte solution pouring process. In the electrolyte solution pouring process before the first charging process, nonaqueous electrolyte solution containing an additive which can form a film on the surface of an anode by charging is to be poured, and in the electrolyte solution pouring process after the first charging process, either the nonaqueous electrolyte solution of which a density of the additive is lighter than the nonaqueous electrolyte solution used in the electrolyte solution pouring process before the first charging process, or the nonaqueous electrolyte which does not contain the above additive are to be poured. <P>COPYRIGHT: (C)2007,JPO&INPIT |
