期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 673, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2023.131821
关键词
Lithium-ion batteries; Si-based anode; Three-dimensional nanosheets; Electrochemical performance
By decorating three-dimensional porous Si/SiOx with nitrogen-doped carbon composites through hydrothermal and megnesiothermic reduction, we achieved a high reversible capacity of 1082 mAh g-1 after 200 cycles at a current density of 200 mA g-1. The rate performance of the composites was evaluated from 100 to 1000 mA g-1, and even at a high current density of 1000 mA g-1, the reversible specific capacity remained at 510 mAh g-1. The good electrochemical performance of the composites can be attributed to the three-dimensional porous structure and the introduced nitrogen-doped carbon.
Nano-sized Si-based materials have been proposed as one of the most promising anodes of lithium-ion batteries (LIBs) due to their advantageous capacity. However, the widespread use of nano-sized Si-based material is still limited by their high cost, large volume expansion, and intrinsically low conductivity. Here, we demonstrate the decoration of three-dimensional porous Si/SiOx with nitrogen-doped carbon composites via a hydrothermal and megnesiothermic reduction. The as-prepared composites deliver a high reversible capacity of 1082 mAh g-1 after 200 cycles at a current density of 200 mA g-1. The rate performance of the composites was evaluated from 100 to 1000 mA g-1, even at a high current density of 1000 mA g-1, the reversible specific capacity remained at 510 mAh g-1. The good electrochemical performance of the composites may be ascribed to the three-dimensional porous structure, which relieves the volume changes of Si/SiOx during lithiation/delithiation processes. In addition, the introduced nitrogen-doped carbon can offer additional active sites for storage capacity and increase the electrical conductivity. Therefore, this work provides a promising anode for high-energy-density LIBs.
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