Improving the Li-Electrochemical Properties of Monodisperse Ni2P Nanoparticles by Self-Generated Carbon Coating

Abstract : Carbon coating of electrode materials is nowadays a major tool to improve the electronic percolation of the electrode. In this study, a self-generated carbon coating is described as a new way to deposit a regular thin layer of carbon on the surface of nanoparticles. It relies on the soft decomposition of the nanoparticles surface native ligands, containing alkyl chains, under inert atmosphere at 400 °C, a route particularly suited for oxidation-sensitive nanoparticles. Using 25 nm monodispersed Ni2P nanoparticles as a model phase, we succeeded in forming nonsintered and nonoxidized carbon-coated nanoparticles. The carbon coating is then tuned in thickness by modifying the ligands set. Electrochemical properties of the resulting Ni2P/C nanoparticles vs Li are compared with those of bulk Ni2P. Both materials are shown to undergo a conversion reaction. The capacity of the bulk material collapses after a few cycles while Ni2P/C nanoparticles show much better retention. The self-generated carbon coating is thus found to promote Li uptake by providing a Li-permeable electron-conductive percolating network and by improving the mechanical integrity of the electrode.
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Submitted on : Tuesday, November 19, 2013 - 11:42:16 AM
Last modification on : Friday, March 22, 2019 - 1:39:10 AM

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Sophie Carenco, C. Surcin, M. Morcrette, D. Larcher, Nicolas Mézailles, et al.. Improving the Li-Electrochemical Properties of Monodisperse Ni2P Nanoparticles by Self-Generated Carbon Coating. Chemistry of Materials, American Chemical Society, 2012, 24 (4), pp.688-697. ⟨10.1021/cm203164a⟩. ⟨hal-00906123⟩

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