Graphene Mass Production via Spontaneous Lithium Intercalation

The patent applies the self-service principle by utilizing the spontaneous lithium intercalation process that occurs naturally during lithium ion battery charging. The lithium ions automatically intercalate into the graphite electrode structure without requiring external energy input for the intercalation step itself. This spontaneous process eliminates the need for energy-intensive mechanical exfoliation, CVD, or oxidation-reduction methods, thereby achieving high graphene yield without proportional energy input increase.

The patent utilizes phase transitions in the lithium intercalation process. During battery charging, lithium ions undergo phase transition from the electrolyte into the graphite structure, forming a graphite intercalation compound. This phase transition is driven by the electrochemical potential difference during charging, not by external energy input. The subsequent exfoliation step uses solvent insertion to separate the layers, another phase transition process that occurs spontaneously under appropriate conditions, enabling high-yield graphene production without conventional energy-intensive methods.

The patent simplifies the process by using the self-service characteristic of lithium ion intercalation during normal battery charging. Instead of requiring complex external energy input or multiple processing steps, the lithium ions automatically intercalate into the graphite structure during charging, and the subsequent exfoliation occurs spontaneously when the intercalated compound is exposed to suitable solvents. This eliminates the need for complex mechanical, thermal, or chemical processing equipment, reducing both process complexity and production costs while maintaining high productivity.

The patent applies universality by utilizing the existing lithium ion battery charging process to achieve graphene production. The same electrochemical process that charges the battery (lithium intercalation) is also used to form the graphite intercalation compound for graphene preparation. This multi-functional use of the charging process eliminates the need for separate, dedicated graphene synthesis equipment and procedures, thereby reducing device complexity and operational costs while maintaining high production efficiency.

The patent achieves high graphene quality and large area by utilizing the self-service lithium intercalation process. The spontaneous intercalation of lithium ions into the graphite structure during battery charging creates a uniform graphite intercalation compound throughout the electrode material. This uniform distribution ensures that subsequent exfoliation produces high-quality graphene with consistent properties across large areas, eliminating the limitations of conventional methods that produce fragmented or low-quality graphene due to non-uniform processing.

The patent utilizes phase transitions to achieve high-quality, large-area graphene. The lithium intercalation process creates a uniform phase transition throughout the graphite structure, forming a consistent graphite intercalation compound. When this compound undergoes exfoliation through solvent insertion, the uniform phase structure ensures that graphene layers are separated evenly across the entire sample area, producing high-quality graphene with large surface area rather than fragmented or defective material.