Development of film-like lithium battery with solid polymer electrolyte

In response to the demand for a small and thin battery for electronic devices which are becoming small, the Yuasa Corporation has been developing film-like lithium batteries with solid polymer electrolyte, both primary and secondary. As a result of this effort, Yuasa has recently developed a film-like lithium primary battery as thin as 0.2-0.3 mm, which utilizes a solid polymer electrolyte. This battery has an energy density higher than that of the alkaline manganese dioxide dry battery, and shows discharge performance at high current drain under low temperature, which is comparable with that of a lithium primary battery with liquid electrolyte. The battery features high reliability, and is expected to be used as a power source for various thin electronic devices such as the international standard 0.76 mm thick wireless card, and for memory backup. The secondary battery, when developed, is expected to be used as a power source for the personal digital assistance, the cellular phone, etc., taking advantage of its thin design and the flexibility to design the battery in various shapes