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Poster De Conférence Année : 2017

Mass production of silicon nanowires for Lithium-ion battery

Résumé

First produced by thin film technologies (CVD growth or etching), silicon nanowires (SiNWs) have shown great promises in nanoelectronics, sensors and energy storage. For the latter, high quantities of SiNWs are required. We recently developed a new technology of SiNW synthesis that allows for the preparation of large quantities of SiNWs in bulk in a small, simple reactor within a few hours. Our SiNWs are grown on metal nanoparticles deposited on an unreactive nanopowder of NaCl. After synthesis, the NaCl powder is dissolved in water to recover a dense mat of pure SiNWs. From an air-stable organosilane oil as Si source, about 200mg of SiNWs are obtained in a 100mL steel reactor. NaCl particles play a critical role as a “solid solvent”, keeping catalysts available to reactive gases and apart from each other during growth. Bulk grown SiNWs behave differently from SiH4-fed CVD-grown SiNWs: long and very thin (10nm), very small in diameter, they are strongly hydrophobic and show a low oxygen content even after exposure to air. Lithium-metal batteries made of SiNW-based anodes had a long cycling ability with a stable, high energy capacity (1800mAh/gSi over >100 cycles at 1C) with an initial capacity loss in the first charge-discharge cycles as low as 20%. (poster 13BZD)

Domaines

Matériaux
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Dates et versions

hal-01976388 , version 1 (10-01-2019)

Identifiants

  • HAL Id : hal-01976388 , version 1

Citer

Pascale Chenevier, Gerard Lapertot, David Aradilla, Peter Reiss, Laurent Puech, et al.. Mass production of silicon nanowires for Lithium-ion battery. European Materials Research Society Fall Meeting 2017, Sep 2017, Warsaw, Poland. , 2017. ⟨hal-01976388⟩
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