Development of film-like lithium battery using solid polymer electrolyte

Electronic devices with reduced size and weight require thin and small batteries. Yuasa Corporation has developed a primary film-like lithium battery with a thickness of 0.3 mm using a solid polymer electrolyte. This primary film-like lithium battery has the following features: it is thin; it has high energy density; it has high safety; it has good heat resistance; and it provides large freedom in designing the battery into different shapes. With respect to safety in particular, the battery has passed the UL standard, and was qualified (UL File No. MH25228). This battery shows discharge characteristics comparable with those of primary lithium batteries using liquid electrolyte under low temperatures and with high currents. The battery is expected to be of use in applications such as power supplies for various thin electronic devices like internationally-standardized wireless cards with a thickness of 0.76 mm, and as a power supply for memory backups. Expectations are placed on secondary batteries under development that may be used as power supplies for cellular phones, personal digital assistants and notebook personal computers