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Silicon-based lithium battery may soon become a new industry standard. However, silicon has a serious expansion problem, which hinders its commercialization process. The multidisciplinary research team from BeDimensional, the Italian Institute of Technology (IIT) and the flagship graphene project of VARTAMicroInnovation GmbH in Austria has determined how to use graphene as the key component to overcome the expansion of silicon-based materials in practical applications.

According to the current situation, it is believed that silicon is a strong competitor for the next generation of anode materials for lithium batteries. Replacing the most advanced graphite anode with silicon can increase the storage capacity of lithium battery by 10 times. However, during charging and discharging, silicon will expand and shrink, resulting in mechanical stress on the material and structural damage, which will eventually lead to battery failure after only a few times of use. At present, researchers of the graphene flagship project have designed a method to keep lithium batteries stable by using a small amount of graphene. This newly developed battery with graphene can withstand 300 charge-discharge cycles, and its capacity is 30% higher than that of any existing alternative method.

Christoph Stangl, a partner of the Graphene Flagship Program, from VARTAMicroInnovation GmbH, explained that only a small amount of graphene was enough to evenly expand and stabilize the electrode structure in silicon, which enabled people to really use the outstanding performance of silicon-based lithium batteries. After research and development, this button battery with graphene can be used in numerous small electronic products produced by some important companies around the world, including watches, wearable devices, car keys and wireless headphones. The applied industries are rapidly rising market segments. VARTA is famous for developing customized energy storage solutions. High-energy technology progress based on silicon/graphene will promote the production of better batteries.

Vittorio Pellegrini of BeDimensional, a member of the graphene flagship program, said that the above milestone design could be achieved by adding a small amount of graphene. If a large amount of graphene is added, the proportion of silicon in the battery will be reduced, and the overall capacity of the battery will be reduced. Silicon adds energy that can be stored in the battery. Due to the addition of a small amount of graphene, the problem of battery structure damage and failure can be prevented while maintaining the battery capacity.

The flagship graphene project funded by the European Union has helped promote the development of this research in many ways. In the first phase of the project implementation, not only the initial idea of developing batteries with graphene was decided, but also the BeDimensional Company was specially established to supply graphene materials and develop many new graphene-based technologies using patented graphene production methods.

The collaborative use of the graphene flagship program brings together the cutting-edge research work of IIT, the newly derived BeDimensional and the mature industrial manufacturers like VARTA for integrated innovation. Due to the existence of pioneering projects in the graphene flagship project, researchers can really focus on improving technical maturity and creating highly mature product prototypes. At present, the research team is committed to commercializing this battery technology. The team is facing a new challenge to develop a long-endurance and reliable graphene battery for electric vehicles.

The success of this cooperation shows that the pioneering project of the graphene flagship project can greatly help researchers transfer materials from the laboratory to the actual component, component and system integration development.

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