Sony Corp prototyped an all-solid-state battery using a solid material for its electrolyte.

It is a thin film-type rechargeable battery made by forming solid electrolyte on a resin film and was realized by developing a new positive electrode material. With a high design freedom, it can be bent or folded. Also, a high-temperature treatment is not required at the time of production, lowering cost.

Sony aims to commercialize the battery in several years, expecting that it will be employed for small, slim wearable devices as well as bendable, foldable flexible devices.

Sony announced the all-solid-state battery at the 56th Battery Symposium in Japan, which took place from Nov 11 to 13, 2015, at WINC Aichi (lecture number: 2F17). The company made an announcement about its prototyped all-solid-state thin film-type rechargeable battery on an academic journal in 2014. But this is the first time that it has made the announcement at Battery Symposium.

All-solid-state batteries using a solid electrolyte are considered to be safer than conventional batterie using an organic electrolyte, and they are being actively researched and developed around the globe. Sony's entry into the field might promote the research and development of electrode materials, peripheral components, etc.

This time, Sony announced a noncrystalline (amorphous) positive electrode material for all-solid-state batteries and the results of the evaluation of its properties. Commonly-used all-solid-state thin-film rechargeable batteries use a crystalline material as a positive electrode active material and, thus, require a high-temperature film forming process.