Product Sector: Energy → Energy Storage → Electrical Energy → Battery
Lithium ion batteries are the most promising candidates to meet for tomorrow's mobile energy requirements. So far they had just one problem: they could not be used for large-scale power storage for safety reasons.
The weak point was the battery separator. So far semi-permeable polymer membranes have been used to separate the anode and cathode. However, these plastic separators have two major drawbacks: they are flammable and they are only stable up to 140°C. If the batteries are overcharged, the separators can overheat, melt and trigger a short circuit. And that makes them likely to explode.
Nano particles deliver excellent properties
The answer is SEPARIONŽ - a new type of separator that gives lithium ion batteries outstanding properties. This ceramic separator from Evonik is stable to temperatures of up to approx. 700 °C.
SEPARION® flexible ceramic separator.
SEPARIONŽ is a combination of ceramics and polymers, two materials that are normally completely incompatible because of their differing temperature profiles. Now they can be combined thanks to nano-scale oxides. For example, zirconium oxide is used as a functional component in these separators to ensure the integrity of the material, its nanoporosity and flexibility.
In 2007 Evonik's SEPARIONŽ team was nominated for the German Future Award.
SEPARIONŽ in Li-Tec cells
Today's Li-Tec cells incorporate a ceramic separator from Evonik, making them perfectly suitable for use in electric vehicles. These world-leading flat-cell batteries combine high power density in with a compact form and outstanding safety, which naturally has top priority in high-performance batteries. These flat-cell lithium ion batteries are to be used by Mercedes-Benz Cars in the near future.