Graphite for lithium-ion batteries | Hosokawa Micron Group

The anode of a battery consists of an approx. 8 - 18 µm thick copper foil, which is coated with active material (graphite) and various additives.
Graphite is therefore the most important battery anode material in the production of lithium-ion batteries. The black, platelet-shaped mineral is widely sourced and brings a number of numerous advantages for the manufacturer. After coating, the tap density of graphite is relatively high and the electro-chemical performance is relatively stable. Additionally, the actual specific capacity density can be close to the theoretical specific capacity. However, graphite also carries several disadvantages as a battery anode material. Most of all, its capacity to meet the actual demand is insufficient - a demand that is expected to increase rapidly in the next years, mainly driven by the growing number of electric vehicles. 

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To meet the demand for graphite in the long term, the graphite in battery production must be processed with as little loss as possible. In this way, the graphite can be used as effectively as possible. In addition, the characteristics of the graphite must be advanced in order to increase the performance of the battery. The particle size plays a role here because it determines how quickly the battery can be charged and discharged. At the same time, the tap density determines the energy density, i.e. the distribution of the graphite on the surface of the anode copper foil. The specific surface area also influences the capacity of the battery after the first charge. 

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To achieve the optimum battery performance results, ON has developed technologies for advancing both natural and synthetic graphite.

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