Si/TiSi2 Heteronanostructures as high-capacity anode material for li ion batteries.
We synthesized a unique heteronanostructure consisting of two-dimensional TiSi(2) nanonets and particulate Si coating. The high conductivity and the structural integrity of the TiSi(2) nanonet core were proven as great merits to permit reproducible Li(+) insertion and extraction into and from the Si coating. This heteronanostructure was tested as the anode material for Li(+) storage. At a charge/discharge rate of 8400 mA/g, we measured specific capacities >1000 mAh/g. Only an average of 0.1% capacity fade per cycle was observed between the 20th and the 100th cycles. The combined high capacity, long capacity life, and fast charge/discharge rate represent one of the best anode materials that have been reported. The remarkable performance was enabled by the capability to preserve the crystalline TiSi2 core during the charge/discharge process. This achievement demonstrates the potency of this novel heteronanostructure design as an electrode material for energy storage.
Zhou
Sa
S
Department of Chemistry, Merkert Chemistry Center, Boston College, 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, USA.
Liu
Xiaohua
X
Wang
Dunwei
D
D003460:Crystallization / Q000379:methods; D011211:Electric Power Supplies; D004566:Electrodes; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D017640:Silicates / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D017640:Silicates; C103828:titanium silicide; D014025:Titanium; D012825:Silicon