Manipulating Oxidation of Silicon with Fresh Surface Enabling Stable Battery Anode.
basic_science · Level V
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- Record sourced from PubMed, PMID 33734706.
- Also identified by DOI 10.1021/acs.nanolett.1c00317.
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Abstract
Silicon (Si)-based material is a promising anode material for next-generation lithium-ion batteries (LIBs). Herein, we report the fabrication of a silicon oxide-carbon (SiO<sub><i>x</i></sub>/C) nanocomposite through the reaction between silicon particles with fresh surface and H<sub>2</sub>O in a mild hydrothermal condition, as well as conducting carbon coating synchronously. We found that controllable oxidation could be realized for Si particles to produce uniform SiO<sub><i>x</i></sub> after the removal of the native passivation layer. The uniform oxidation and conductive coating offered the as-fabricated SiO<sub><i>x</i></sub>/C composite good stability at both particle and electrode level over electrochemical cycling. The as-fabricated SiO<sub><i>x</i></sub>/C composite delivered a high reversible capacity of 1133 mAh g<sup>-1</sup> at 0.5 A g<sup>-1</sup> with 89.1% capacity retention after 200 cycles. With 15 wt % SiO<sub><i>x</i></sub>/C composite, graphite-SiO<sub><i>x</i></sub>/C hybrid electrode displayed a high reversible specific capacity of 496 mAh g<sup>-1</sup> and stable electrochemical cycling with a capacity retention of 90.1% for 100 cycles.