Solution-grown germanium nanowire anodes for lithium-ion batteries.
Solution-grown germanium (Ge) nanowires were tested as high capacity anodes in lithium ion (Li-ion) batteries. Nanowire films were formulated and cast as slurries with conductive carbon (7:1 Ge:C w/w), PVdF binder and 1.0 M LiPF(6) dissolved in various solvents as electrolyte. The addition of fluorethylene carbonate (FEC) to the electrolyte was critical to achieving stable battery cycling and reversible capacities as high as 1248 mA h g(-1) after 100 cycles, which is close to the theoretical capacity of 1,384 mA h g(-1). Ge nanowire anodes also exhibited high rate capability, with reversible cycling above 600 mA h g(-1) for 1200 cycles at a rate of 1C. The batteries could also be discharged at 10C with a capacity of 900 mA h g(-1) when charged at 1C.
Department of Chemical Engineering, Texas Materials Institute, Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712-1062, USA.
Aaron M
AM
Chockla
Kyle C
KC
Klavetter
C Buddie
CB
Mullins
Brian A
BA
Korgel
D011211:Electric Power Supplies; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D005857:Germanium / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*
D004573:Electrolytes; D007477:Ions; D005857:Germanium; D008094:Lithium