• • Achieved an initial coulombic efficiency (ICE) of 81.4% and a charge transfer resistance (Rct) of 16.4 Ω after 200 cycles, representing a 64% reduction, indicating enhanced interfacial kinetics and stability.
• • Delivered a high reversible capacity of 1719.3 mAh g−1 at 0.2 C after 200 cycles and 823.8 mAh g−1 at 0.5 C after 500 cycles, demonstrating excellent long-term cycling stability.
• • The molten salt electrolysis synthesis achieved a current efficiency of 68.12% and specific energy consumption of 12.76 kWh kg−1, with an estimated electricity cost of 1154.69 USD ton−1, which is only 20% of commercial Si/C anode prices, offering a significant cost advantage for scalable production.
• • The hierarchical design with porous crystalline-amorphous silicon core and MgSiN2-derived Li3N-rich SEI effectively mitigates volume expansion and ensures fast Li+ diffusion (D Li+ = 1.72×10−11 cm2 s−1), addressing the ICE-cycle life trade-off.