Sony Demonstrates Full Solid State Battery

Sony has developed a prototype of a liquid-free battery that can be manufactured for the most part at room temperature. The electronics giant presented its developments at the 56th Battery Symposium in Japan.

That writes the Japanese Nikkei Technology on its site. The rechargeable battery that Sony is working on is made up of a solid electrolyte that is formed on a film of synthetic resin. According to the report, Sony developed a new kind of positive electrode made of a non-crystalline material for this purpose. Many solid-state batteries use materials with a crystal lattice that require high temperatures to form.

The positive electrode developed by Sony uses a lithium compound with phosphoric acid. The prototype of the positive electrode was made by applying the material in several layers to a 400 micrometer thick polycarbonate film. As the solid electrolyte, Sony used a lithium-phosphorus-oxynitride film with a thickness of 500nm. As the transition material for the positive electrode, Sony tested several materials, including nickel, manganese, cobalt, copper and silver. The best results were obtained with nickel. The capacity per gram was 330mAh with a C rating of 30.

Before the battery can be commercially produced, self-discharge must be prevented, among other things. The most promising prototype can be charged and discharged up to two thousand times. The big advantage of solid-state batteries is that they do not contain liquids, so they do not leak. In addition, the casing needs to be less sturdy, the risk of explosions is smaller and the battery can be produced in all kinds of shapes.

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