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Article Dans Une Revue RSC Advances Année : 2019

Pitch-based carbon/nano-silicon composite, an efficient anode for Li-ion batteries

Résumé

As silicon-carbon electrodes with low silicon ratio are the negative electrode foreseen by battery manufacturers for the next generation of Li-ion batteries, a great effort has to be made to improve their efficiency and decrease their cost. Pitch-based carbon/nano-silicon composites are proposed as a high performance and realistic electrode material of Li-ion battery anodes. Composites are prepared in a simple way by the pyrolysis under argon atmosphere of silicon nanoparticles, obtained by a laser pyrolysis technique, and a low cost carbon source: petroleum pitch. The effect of the size and the carbon coating of the silicon nanoparticles on the electrochemical performance in Li-ion batteries is highlighted, proving that the carbon coating enhances cycling stability. Helped by a homogeneous dispersion of silicon nanoparticles into the amorphous carbon matrix, a high coulombic efficiency (especially in the first cycle) and a high stability over cycling is observed (over 1100 mA h g À1 after 100 cycles at relatively high current density 716 mA g À1 for Si based electrodes), which are superior to pitch-based carbon/silicon composites found in literature. This simple synthesis method may be extrapolated to other electrode active materials.

Domaines

Matériaux
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Dates et versions

hal-02090035 , version 1 (06-07-2020)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Angel Manuel Escamilla-Pérez, Aude Roland, Sophie Giraud, Céline Guiraud, Héloïse Virieux, et al.. Pitch-based carbon/nano-silicon composite, an efficient anode for Li-ion batteries. RSC Advances, 2019, 9 (19), pp.10546-10553. ⟨10.1039/c9ra00437h⟩. ⟨hal-02090035⟩
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