Journal
JOURNAL OF ENERGY STORAGE
Volume 73, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2023.109142
Keywords
Lithium-ion batteries; Micron/submicron Si; Silicon/carbon materials; Rice husks; Silicon; Carbon
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In this study, a simple method for converting micron/submicron Si into Si/C composites with good long cycle performance was proposed. The method does not require complex synthesis steps, expensive carbon precursors, or special equipment. The material showed a high reversible specific capacity and good capacity retention after 700 cycles.
Conversion of micron/submicron Si into Si/C composites as anode material for lithium ion battery (LIB) has received extensive attention. However, there is lack of simple methods for changing micron/submicron Si into Si/C composites with good long cycle performance (>550 cycles). In this study, micron/submicron Si was sequentially mixed with graphite (G) and glucose by ball milling, and then carbonized to yield Si@G-C composite. The proposed process for converting micron/submicron Si into Si/C is pretty simple, because it does not need complex synthesis steps, expensive carbon precursors, or special equipment. Most Si particles in this composite were covered by graphite and glucose-based amorphous carbon, which hindered contact of Si with electrolyte and enhanced material conductivity. Benefiting from this feature, the material showed a reversible specific capacity of 903.2 mAh/g after 700 cycles at 0.5 A/g current density, with capacity retention reaching 95.6 %. The long-cycle specific capacity exceeded the corresponding value of many micron/submicron-Si-based Si/C composites. The proposed simple method for preparing micron/submicron-Si-based Si/C was promising for industrial application.
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