Mullane Emma, Kennedy Tadhg, Geaney Hugh, Ryan Kevin M
Materials and Surface Science Institute and the Department of Chemical and Environmental Sciences, University of Limerick , Limerick, Ireland.
ACS Appl Mater Interfaces. 2014 Nov 12;6(21):18800-7. doi: 10.1021/am5045168. Epub 2014 Nov 4.
A rapid synthetic protocol for the formation of high-performance Ge nanowire-based Li-ion battery anodes is reported. The nanowires are formed in high density by the solvent-free liquid deposition of a Ge precursor directly onto a heated stainless steel substrate under inert conditions. The novel growth system exploits the in situ formation of discrete Cu3Ge catalyst seeds from 1 nm thermally evaporated Cu layers. As the nanowires were grown from a suitable current collector, the electrodes could be used directly without binders in lithium-ion half cells. Electrochemical testing showed remarkable capacity retention with 866 mAh/g achieved after 1900 charge/discharge cycles and a Coulombic efficiency of 99.7%. The nanowire-based anodes also showed high-rate stability with discharge capacities of 800 mAh/g when cycled at a rate of 10C.
报道了一种用于形成高性能锗纳米线基锂离子电池阳极的快速合成方案。在惰性条件下，通过将锗前驱体无溶剂液体沉积直接在加热的不锈钢基板上，以高密度形成纳米线。这种新型生长系统利用了由1纳米热蒸发铜层原位形成离散的Cu3Ge催化剂晶种。由于纳米线是从合适的集流体上生长出来的，因此电极可直接用于锂离子半电池中，无需使用粘结剂。电化学测试显示出显著的容量保持率，在1900次充放电循环后达到866 mAh/g，库仑效率为99.7%。基于纳米线的阳极在以10C的速率循环时也表现出高倍率稳定性，放电容量为800 mAh/g。
