Breakthrough Si-based Anode Material: Sieving-Pore Structure Enables High-Performance Lithium-Ion Batteries
Researchers have developed a novel silicon-carbon composite anode material (SSC) using a two-step chemical vapor deposition method. The SSC material features a unique sieving-pore structure with sub-nanometer pore entrances that effectively sieve the electrolyte, suppressing the formation of organic-rich SEI and promoting the formation of inorganic-rich SEI. This inorganic-rich SEI not only stabilizes the interface but also provides fast Li+ transport pathways. Simultaneously, the combined effect of the sieving-pore structure and inorganic-rich SEI mechanically confines the volume expansion of Si, inhibiting the formation of c-Li15Si4 and enhancing cycling stability. Experimental results demonstrate that the SSC anode exhibits high reversible capacity, excellent cycling life, and rate capability, showing great potential for high-energy density lithium-ion batteries.
