Sn(78)Ge(22)@carbon core-shell nanowires as fast and high-capacity lithium storage media.
Branched Sn78Ge22@carbon core-shell nanowires were prepared by thermal annealing of butyl-capped Sn78Ge22 clusters at 600 degrees C in a vacuum. The first discharge and charge capacities are 1250 and 1107 mA h/g, showing a Coulombic efficiency of 88%. Such a one-dimensional core-shell design exploits the benefits of the Sn78Ge22 nanowire to produce an exceptional high rate lithium reactivity (93% Coulombic efficiency at 8C (=6400 mA/g) rate) as well as excellent capacity retention after extended cycles (capacity retention of 94%).
Lee
Hyojin
H
Department of Applied Chemistry, Kumoh National Institute of Technology, Gumi, 730-701 Korea.
Cho
Jaephil
J
D002244:Carbon / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000379:methods*; D005857:Germanium / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D013499:Surface Properties; D017971:Tin Compounds / Q000737:chemistry*
D046911:Macromolecular Substances; D017971:Tin Compounds; D005857:Germanium; D002244:Carbon; D008094:Lithium