期刊
NANO ENERGY
卷 84, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.105935
关键词
Silicon anodes; Covalent bonding; MXene; Solid-electrolyte interphase; Coulombic efficiency
类别
资金
- National Natural Science Foundation of China [21938005]
- Natural Science Foundation of Shanghai [19ZR1424600]
By introducing the Ti-Si covalent bond, this study successfully strengthens the interfacial stability between nano-Si and MXene-derived artificial SEI layer, addressing the capacity decay issue of silicon anode materials in lithium-ion batteries, improving initial Coulombic efficiency and cycling stability.
Nanostructured silicon-based materials are the promising anodes for next-generation lithium-ion batteries. However, as the result of the weak adhesion of solid-electrolyte interphase (SEI) to Si, the fracture, exfoliation and subsequent regrowth of SEI layer on the expanded Si remains unsolved, leading to low initial Coulombic efficiency (ICE) (50-80%). Herein, the Ti-Si covalent bond between nano-Si and MXene-derived artificial SEI layer is elaborately introduced, to effectively strengthen the interfacial stability and suppress the excessive interfacial side reaction. Upon the three-times expansion during first cycling, the as-obtained anodes with the ultrathin SEI still deliver a high ICE of 91.4%. Due to the stable interfacial ionic conduction, remarkable capacity retention of 90.7% after 1000 cycles at 5 A g- 1 with an average Coulombic efficiency of 99.8% could be maintained. This strategy provides new insight into designing durable alloy anodes from the point of the interfacial adhesion strength.
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