Yolk-shell silicon anode material coated with nitrogen-doped carbon

doi:10.3969/j.issn.1000-5641.2022.01.004

Abstract

Abstract:

Using resorcinol-formaldehyde resin as the carbon source, melamine as the nitrogen source, and NaOH as the etchant, a nitrogen-doped carbon-coated silicon (Si@void@N-C) anode material with a yolk-shell structure was synthesized. The samples were characterized and tested by XRD, SEM and X-ray photoelectron spectroscopy, TEM, and electrochemical tests; the results confirmed that a Si@void@NC composite anode material with a yolk-shell structure was successfully synthesized. The material was found to have excellent electrochemical performance. The initial capacity reached 1282.3 mA/g after charging and discharging at a current density of 0.1 A/g. After 100 cycles, its specific capacity was as high as 994.2 mAh/g with a capacity retention of 77.5%, demonstrating good cycle performance. The nitrogen-doped carbon shell of the Si@void@N-C material helps with the electrical conductivity of the composite material. Meanwhile, the yolk-shell structure effectively alleviates the volume effect of silicon; this feature is beneficial to the formation of a stable SEI film and improves the cycle stability of the battery.

Key words: lithium-ion battery, nitrogen-doped carbon, silicon-based anode, yolk-shell structure

CLC Number:

TM912.9

Kaijing BAO, Zhaokai ZHANG, Xianqing PIAO, Zhuo SUN. Yolk-shell silicon anode material coated with nitrogen-doped carbon[J]. Journal of East China Normal University(Natural Science), 2022, 2022(1): 22-30.

Figures/Tables 9

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