Breakthrough in Nanotechnology: Porous Si@C Nanosheets Show Promise for Next-Generation Lithium-ion Batteries

Research conducted at the Beijing University of Chemical Technology has led to the discovery of porous Si@C nanosheets, which demonstrate exceptional cycling stability and rate capability when used as an anode material for lithium-ion batteries. The study, funded by the National Natural Science Foundation of China, overcame significant limitations associated with traditional silicon anodes by utilizing photovoltaic Si waste and a novel alloying and CO2 thermic-oxidation process.

Key Takeaways:

• The porous Si@C nanosheets were prepared from photovoltaic Si waste via a simultaneous bulk porosity engineering and carbon-coating process.
• This novel structure provides additional buffering for volume expansion and constructs more efficient ionic and electronic transport channels.
• The research concluded that the porous Si@C nanosheets demonstrate an outstanding cycling stability with a high reversible specific capacity of 786.4 mA h g-1 at 1 A g-1 after 750 cycles.
• The nanosheets also show a large rate capability with a specific capacity of 879 mA h g-1 at 5 A g-1.
• The study was funded by the National Natural Science Foundation of China (NSFC) and has been peer-reviewed for publication.
• The research was conducted by a team of scientists led by Dongmei Han at the Beijing University of Chemical Technology.
• The novel nanosheets have the potential to revolutionize the field of lithium-ion batteries and contribute to the development of more efficient and sustainable energy storage technologies.

Statistics:

• 786.4 mA h g-1: The high reversible specific capacity of the porous Si@C nanosheets at 1 A g-1 after 750 cycles.
• 879 mA h g-1: The specific capacity of the nanosheets at 5 A g-1.
• 750 cycles: The number of charge-discharge cycles at which the nanosheets demonstrated an outstanding cycling stability.
• 1 A g-1: The current density at which the nanosheets showed a high reversible specific capacity of 786.4 mA h g-1.
• 5 A g-1: The current density at which the nanosheets showed a specific capacity of 879 mA h g-1.

Sources:

• NewsRx. Studies from Beijing University of Chemical Technology Update Current Data on Nanosheets (Porous Si@c Nanosheets Derived From Photovoltaic Si Waste As a High-performance Anode Material for Lithium-ion Batteries). Electronics Newsweekly. August 5, 2025; p 2289.
• Energy & Fuels. Porous Si@c Nanosheets Derived From Photovoltaic Si Waste As a High-performance Anode Material for Lithium-ion Batteries. 2025.