Japanese lithium battery submarines use solid lithium batteries.
Current Japanese lithium battery submarines use solid-state lithium battery technology. Solid-state lithium batteries have higher energy density, higher safety and stability than traditional liquid lithium batteries. Solid lithium batteries use solid electrolytes instead of liquid electrolytes and have less risk of combustion and explosion. This is very important for highly security sensitive applications, such as submarines. Solid-state lithium batteries also offer longer life, faster charging, and better low-temperature performance. These advantages make solid-state lithium batteries an ideal choice for modern underwater power systems.