Lithium-storage properties of SiO2 nanotubes@C using carbon nanotubes as templates--颗粒学报PARTICUOLOGY

Shi, Z., Shi, C., Shi, H., He, B., Qin, G., Li, A., . . . Chen, J. (2023). Lithium-storage properties of SiO2 nanotubes@C using carbon nanotubes as templates. Particuology, 83, 32-39. https://doi.org/10.1016/j.partic.2023.02.009

Lithium-storage properties of SiO₂ nanotubes@C using carbon nanotubes as templates

Zixu Shi ^a, Chaoyun Shi ^a, Huili Shi ^a, Binfang He ^a, Guoqiang Qin ^a, Ao Li ^a, Jing Zhu ^a, Jingbo Chen ^{a b *}

a College of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China
b Collaborative Innovation Center of Guizhou Province for Efficient Utilization of Phosphorus and Fluorine Resources, Guizhou University, Guiyang, 550025, China

10.1016/j.partic.2023.02.009

Volume 83, December 2023, Pages 32-39

Received 5 December 2022, Revised 26 January 2023, Accepted 8 February 2023, Available online 28 February 2023, Version of Record 12 March 2023.

E-mail: jbchen@gzu.edu.cn

Highlights

• Silica nanotubes were prepared as lithium ion battery anode materials using carbon nanotubes as templates.

• Citric acid was used as carbon source to improve electronic conductivity and cycle stability of silica nanotubes.

• The method is applicable to large-scale production of silica anode materials for lithium-ion batteries.

Abstract

Silica-based anode material is the most concerned material at present, which has the advantages of good cycle stability, high theoretical specific capacity and abundant reserves. However, silica suffers from inherent low conductivity, severe volume expansion effect and low initial coulombic efficiency, which limits its application in lithium-ion batteries. Nanotubes structure can mitigate the volume expansion during lithiation/delithiation. In this article, silica nanotubes (SNTs) were prepared using carbon nanotubes (CNTs) as a template, and then the uniform carbon layer was coated on their surface by carbonization of citric acid. The hollow structure of nanotubes provides more sites for the insertion of Li⁺ during lithiation and additional channels for Li⁺ migration in the cycles, which improves the electrochemical performance. Conductivity can be enhanced by coating carbon layer. The specific capacity of the composite material is about 650 mAh g⁻¹ at 0.1 A g⁻¹ after 100 cycles. With a specific capacity of 400 mAh g⁻¹ even at 1 A g⁻¹ after 100 cycles. The silica-based material is a competitive anode material for lithium-ion batteries.

Graphical abstract

Keywords

Hard template; SiO₂ nanotubes; MWCNT; Lithium-ion batteries

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