Empa improves solid-state batteries

(CONNCET) Researchers from the Functional Polymers department at Empa have developed a new type of electrolyte for solid-state batteries. It is based on a synthetic polymer from the group of polysiloxanes (silicones), Empa reports in a press release. The group led by Empa researcher Dorina Opris has succeeded in turning silicone, which is actually apolar, into a good ion conductor.

The great advantage of the new electrolyte lies in its elasticity. With conventional solid-state batteries, there is a risk that cavities will form when the electrons migrate from the anode, reducing the capacity of the battery. The silicone electrolyte developed by Empa can fill these cavities, but is also strong enough to prevent the build-up of dendrites. Such tree-like structures of lithium ions can form in batteries with liquid electrolytes and lead to short circuits.

In addition to improving solid-state batteries, the Empa researchers are also looking at the use of their electrolyte in flexible batteries: "Today's batteries for medical implants, such as pacemakers, are usually hard and uncomfortable for patients," Opris is quoted as saying in the press release. "Our polymer can serve not only as an electrolyte, but also as a binding material for the cathode." The researchers are currently working on improving the conductivity of their silicone electrolyte. At the same time, an industrial partner is being sought for the commercialisation of the technology. ce/hs