The unique physical and chemical properties arising from graphene may lead to remarkable advantages in the fields of electronics and energy storage devices. Its superior electronic conductivity and the single-to few-atoms thickness are particularly appealing for the use as anode material for lithium-ion batteries. Graphene ́s electrochemical properties, relevant for its use in batteries, are strongly depending on its synthesis. The innovative method object of this invention is a n ionic liquid-assisted microwave exfoliation of expanded graphite. It allows the bulk production of high-quality multilayer crystalline graphene flakes. Used as anode material in lithium-ion batteries, at low temperatures (< 0°C) it shows advanced lithium-ion storage performance, when compared with commercially available graphite.
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