High-performance lithium battery anodes using silicon nanowires.

Nature Nanotechnology (Impact Factor: 33.27). 01/2008; 3(1):31-5. DOI: 10.1038/nnano.2007.411
Source: PubMed

ABSTRACT There is great interest in developing rechargeable lithium batteries with higher energy capacity and longer cycle life for applications in portable electronic devices, electric vehicles and implantable medical devices. Silicon is an attractive anode material for lithium batteries because it has a low discharge potential and the highest known theoretical charge capacity (4,200 mAh g(-1); ref. 2). Although this is more than ten times higher than existing graphite anodes and much larger than various nitride and oxide materials, silicon anodes have limited applications because silicon's volume changes by 400% upon insertion and extraction of lithium which results in pulverization and capacity fading. Here, we show that silicon nanowire battery electrodes circumvent these issues as they can accommodate large strain without pulverization, provide good electronic contact and conduction, and display short lithium insertion distances. We achieved the theoretical charge capacity for silicon anodes and maintained a discharge capacity close to 75% of this maximum, with little fading during cycling.

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    Journal of Nanoparticle Research 09/2013; 15(9). DOI:10.1007/s11051-013-1915-8 · 2.28 Impact Factor
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    ABSTRACT: In view of the strategic goals for aeronautical research recently established by the International Air Transport Association (IATA) and the European Commission, radically new technology concepts for the provision of motive power to future transport category aircraft need to be considered. As a possible means of ultra-low or zero in-flight emission and a potential long-term alternative to gas turbines, the prospect of utilizing electrically driven motors for motive power are starting to be seriously considered for aerospace vehicle design and integration. In this paper, a forward-looking pre-concept review is given in order to identify the potential applicability of electrically based propulsion in the future. Electric power plant technology is compared and contrasted to advanced gas turbine technology including a variety of technical aspects, such as power plant sizing and performance characteristics as well as aircraft integration and operation. Therefore, a unified theoretical treatment including system boundary definition, efficiency book-keeping and appropriate figures of merit at propulsion system as well as vehicular performance level is introduced and applied.
    61. Deutscher Luft- und Raumfahrtkongress 2012, Berlin, Germany; 09/2012

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