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Friday, December 16, 2022 11:44:17 AM
Thus, the particle structure of the composite anode material 10 of the present invention comprises a buffer matrix which comprises the buffer layer 16 and the void space 20 provided within the capsule 18 between the particles of the active material particle 12 and the interior surface 22 of the graphene capsule 18. The void space 20 within the graphene capsule 18 provides room within which the core material 14, i.e., silicon can expand. In addition, the buffer layer 16 around the core 14 provides mechanical support designed to minimize mechanical degradation and spalling of the core material, i.e., silicon or silicon oxide, during lithiation and delithiation. In addition, the particle structure shown in FIG. 1, further minimizes solid-electrolyte interphase (SEI) loss as the capsule structure 18 compresses the core 14 and thus compresses the SEI against the core 14, thereby minimizing the possibility of mechanical degradation of the SEI from the silicon particle surface. Furthermore, should the core 14 fracture, the capsule structure 18 serves to hold the fractured pieces together in a congruent orientation such that at least some of the fractured pieces are in physical contact, thereby minimizing electrical disconnection and capacity loss.
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