Secondary battery, battery pack, vehicle, and stationary power supply
摘要
說明書
The liquid aqueous electrolyte was poured into the above-described metal can container storing the electrode group, thereby producing a secondary battery. Next, the secondary battery was left stand under a 25° C. environment for 24 hrs. After that, the secondary battery was submitted for initial charge and discharge under a 25° C. environment. In the initial charge and discharge, first, constant current charge was performed by a current of 5 A until the voltage of the secondary battery reached 2.8 V. Next, constant current discharge was performed by a current of 1 A until the voltage reached 2.1 V. Additionally, in the initial charge and discharge, the capacity of the secondary battery was confirmed.
A separator was formed by a method similar to the method described in Example 1 except that the solid content concentration in a solution mixture was changed from 40 mass % to 30 mass %. The thickness of the solid electrolyte layer in this separator was about 18 μm. As a result of TG analysis of the solid electrolyte layer, the ratio of the LATP particles in the solid electrolyte layer was 91.8 mass %, the ratio of the polyvinyl formal resin was 7.3 mass %, and the ratio of the LiTFSI was 0.9 mass %. The separator will be referred to as a separator SP2 hereinafter.
A secondary battery was obtained by a method similar to the method described in Example 1 except that the separator SP2 was used in place of the separator SP1.
