California, June 11 :
What if the battery in your smartphone or electric car can be charged fully in 10 minutes flat?
The three-dimensional, silicon-decorated, cone-shaped carbon-nanotube cluster architecture for lithium-ion battery anodes could enable charging of portable electronic equipment in barely 10 minutes instead of hours.
“Lithium-ion batteries based on this novel architecture demonstrate a high reversible capacity and excellent cycling stability,” said lead study author Wei Wang from Bourns College of Engineering at the University of California, Riverside.
The architecture demonstrates excellent electrochemical stability and irreversibility even at high charge and discharge rates — nearly 16 times faster than conventionally used graphite-based anodes.
The ultrafast rate of charge and discharge can be attributed to two reasons.
Firstly, the seamless connection between graphene-covered copper foil and carbon nanotubes enhances the active material-current collector contact integrity which facilitates charge and thermal transfer in the electrode system.
And secondly, the cone-shaped architecture offers small interpenetrating channels for faster electrolyte access into the electrode which may enhance the rate performance, Wang explained.
Silicon is a type of anode material that is receiving a lot of attention because its total charge capacity is 10 times higher than commercial graphite-based lithium-ion battery anodes.
The study appeared in the journal SMALL.