Transforming of Rigid–Flexible Micro‐Sized Silicon Anodes: Carbothermal Shock Method Yields Durable, High‐Capacity Electrodes

Abstract Silicon is considered as an ideal anode material for high‐specific‐energy lithium‐ion batteries. However, developing silicon anode materials with long cycle life and low volume expansion remains challenging due to its drastic volume expansion. Herein, rigid‐flexible Si@SiC@C composites are successfully synthesized via a scalable carbothermal shock method. Essentially, the silicon anode is stabilized by rigid SiC layer, which limits its volume increase and maintains electrode stability, while the nitrogen‐infused carbon layer assists lithium‐ion movement and improves electrode performance. This unique structural design makes Si@SiC@C electrode exhibit superior lithium storage performance, where it maintains a discharge capacity of 900.1 mAh g −1 after 1000 cycles at 1 A g −1 , with a capacity retention rate of 89.3%. This work provides a pathway for the large‐scale industrial preparation of silicon carbide and for designing high‐performance silicon anode.