Atomic Precision Engineered Silicon‐Carbon Composites for High‐Durability and Low‐Swelling Lithium‐Ion Batteries

ABSTRACT The deployment of silicon anodes in high‐energy lithium‐ion batteries is restricted by substantial volume expansion during cycling. Herein, we report a scalable synthetic strategy for a silicon‐confined porous carbon composite anode to mitigate this limitation. Through an industrial‐scale process, we achieved the atomic‐level confinement of silicon, chemically anchoring single atoms and nanoclusters (below 1.0 nm) within the microporous architecture of a robust carbon host. This engineered structure utilizes pre‐reserved internal void space to accommodate lithiation‐induced expansion, significantly mitigating macroscopic electrode swelling relative to conventional materials. When integrated into 2 Ah P‐Si/C‐Gr||NCM811 pouch cells, the resulting cells deliver a high capacity retention of 81.2% after 1000 cycles with only 11.5% cell swelling. Furthermore, industrial production analysis confirms high consistency and cost‐competitiveness, establishing a viable pathway linking fundamental atomic‐level materials design with commercial requirements (100 kg/batch) for high‐performance silicon anodes.