Scholarlink

<p>SiO<sub><i>x</i></sub> has gained considerable attention as anode material for lithium-ion batteries (LIBs) due to its impressive specific capacity and favorable economic returns. However, volumetric expansion and low electrical conductivity remain the primary obstacles to its further development. In this work, multi-walled carbon nanotubes (MWCNTs) and asphalt are used as carbon precursors to synthesize three-dimensional (3D) networked SiO<sub><i>x</i></sub>/C/MWCNTs composites by using the spray drying, freeze drying and carbonization techniques. In this structure, one end of the MWCNTs is embedded within the SiO<sub><i>x</i></sub>/C matrix, which significantly accelerates electron transport. The other end intertwines and weaves with each other, constructing a unique self-supporting interconnected MWCNT network on the surface of SiO<sub><i>x</i></sub>/C. This MWCNT network, in conjunction with the asphalt-derived carbon layer, collectively imparts exceptional mechanical strength to the composite, effectively mitigating the volume expansion effects of SiO<sub><i>x</i></sub> during cycling. The initial reversible capacity of as-prepared SiO<sub><i>x</i></sub>/C/MWCNTs can reach up to 1439 mAh g<sup>−1</sup> at 0.2 A g<sup>−1,</sup> and its capacity remains at 741 mAh g<sup>−1</sup> after 100 cycles. When at a high current density of 1 A g<sup>−1</sup>, its capacity still remains at 462 mAh g<sup>−1</sup> after 1000 cycles. This work supports the successful integration of a dual-carbon-layer structure into silicon-based materials.</p> Graphical abstract <p>SiO<sub><i>x</i></sub>/C/MWCNTs with a double carbon-layer can effectively enhance structural stability and electronic conductivity.</p> <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Rational design of double carbon-coated SiOx/C/MWCNTs with hierarchical structure for enhanced lithium storage

  • 期刊论文

  • 发表日期：

    2025年5月28日

查看全文
  • Kailong Guo,
  • Donglei Guo,
  • Jiamin Li,
  • Anqi Zhou,
  • Weile Ding,
  • Xuenuan Li,
  • Yuan Luo,
  • Yujie Wang,
  • Shilong Lin,
  • Guilong Liu,
  • Naiteng Wu,
  • Xianming Liu,
  • Aimiao Qin

摘要

SiOx has gained considerable attention as anode material for lithium-ion batteries (LIBs) due to its impressive specific capacity and favorable economic returns. However, volumetric expansion and low electrical conductivity remain the primary obstacles to its further development. In this work, multi-walled carbon nanotubes (MWCNTs) and asphalt are used as carbon precursors to synthesize three-dimensional (3D) networked SiOx/C/MWCNTs composites by using the spray drying, freeze drying and carbonization techniques. In this structure, one end of the MWCNTs is embedded within the SiOx/C matrix, which significantly accelerates electron transport. The other end intertwines and weaves with each other, constructing a unique self-supporting interconnected MWCNT network on the surface of SiOx/C. This MWCNT network, in conjunction with the asphalt-derived carbon layer, collectively imparts exceptional mechanical strength to the composite, effectively mitigating the volume expansion effects of SiOx during cycling. The initial reversible capacity of as-prepared SiOx/C/MWCNTs can reach up to 1439 mAh g−1 at 0.2 A g−1, and its capacity remains at 741 mAh g−1 after 100 cycles. When at a high current density of 1 A g−1, its capacity still remains at 462 mAh g−1 after 1000 cycles. This work supports the successful integration of a dual-carbon-layer structure into silicon-based materials.

Graphical abstract

SiOx/C/MWCNTs with a double carbon-layer can effectively enhance structural stability and electronic conductivity.