Friday, February 6, 2009

Using nanotechnology to improve Li-ion battery performance

nanowerk: "'Metallic tin is considered to be a very promising anode material for lithium batteries mainly for three reasons' Prof. Li-Jun Wan explains to Nanowerk. 

'Firstly, its theoretical specific capacity is much higher than that of conventional graphite. Secondly, the tin anode has higher operating voltage than graphite, so it is less reactive and the safety of batteries during rapid charge/discharge cycle could be improved. And thirdly, a significant advantage of metallic tin over graphite is that it does not encounter solvent intercalation – which causes irreversible charge losses – at all."

The CAS scientists successfully have realized a novel structure design of tin-based anode material to solve the problem of capacity decay. The key to their composite material are nano-sized tin particles that are put into hollow carbon containers, resulting in tin nanoparticles encapsulated with elastic hollow carbon spheres (TNHCs)