Preparation and lithium storage performance of graphene/Si/SiO x nanocomposites

doi:10.19799/j.cnki.2095-4239.2023.0206

Abstract

Abstract:

In this work, the graphene/Si/SiO _x nanocomposites (G//Si/SiO _x ) nanocomposites were synthesized. The synthesis process was done via a facile in situ sol-gel reaction of triethoxysilanein and graphene oxide suspension and a subsequent thermal reduction reaction under H₂/Ar atmospheres. The Si/SiO _x nanospheres with a 100-200 nm size were randomly distributed between two-dimensional graphene sheets in G/Si/SiO _x nanocomposites, in which crystalline Si nanodots with an approximate size of 20 nm were integrated into the amorphous SiO _x matrix. The unique G/Si/SiO _x nanostructure could provide a synergistic effect for electron transport within the electrode, accommodating the Si nanocrystals' volume variation during cycling and leading to excellent electrochemical performance. Benefiting from the unique structural features, the resulting G/Si/SiO _x electrode delivered exceptional rate performance and a high reversible specific capacity of 722.45 mAh/g at a current density of 200 mA/g, which remained at 853.76 mAh/g after 300 cycles.

Key words: lithium ion battery, graphene, silicon, anode, sol-gel reaction

CLC Number:

O 643.3

Yue LI, Bo WANG, Nan WU. Preparation and lithium storage performance of graphene/Si/SiO _x nanocomposites[J]. Energy Storage Science and Technology, 2023, 12(9): 2752-2759.

Figures/Tables 5

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