Well-dispersed tin nanoparticles encapsulated in amorphous carbon tubes as high-performance anode for lithium ion batteries

Renfu Zhuo; Weiwei Quan; Xiaozhong Huang; Qiang He; Zhonggui Sun; Zhiya Zhang; Jun Wang

doi:10.1088/1361-6528/abd4a1

Well-dispersed tin nanoparticles encapsulated in amorphous carbon tubes as high-performance anode for lithium ion batteries

Nanotechnology. 2021 Apr 2;32(14):145402. doi: 10.1088/1361-6528/abd4a1.

Authors

Renfu Zhuo¹, Weiwei Quan¹, Xiaozhong Huang¹, Qiang He¹, Zhonggui Sun¹, Zhiya Zhang^{1

2}, Jun Wang^{1

2}

Affiliations

¹ School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, People's Republic of China.
² Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University, Lanzhou, 730000, People's Republic of China.

PMID: 33333500
DOI: 10.1088/1361-6528/abd4a1

Abstract

Tin/carbon (Sn/C) nanocomposite is considered as a promising anode material for high-performance Li-ion batteries (LIBs). However, since the carbon matrix is always derived from high-temperature carbonization of polymers and Sn has a low melting point (232 °C), the Sn nanoparticles in the Sn/C tend to be heavily aggregated during the carbonization process. It is thus challenging to synthesize well-dispersed Sn nanoparticles in a carbon matrix. Here, we report a facile templating method to encapsulate uniform well-dispersed Sn nanoparticles in amorphous carbon tube (Sn@aCT). The electrode fabricated with the hierarchical Sn@aCT exhibits excellent cycle performance. A stable specific capacity of 870 mAh g^-1 after 350 cycles and a Li-ion diffusion coefficient as high as [Formula: see text] are obtained. Meanwhile, the intermediate structure of SnO₂@aCT and a carbon-coated Sn yolk-shell nanostructure (Sn@C-YS) are investigated for comparison. The results further manifest the advantage of the architecture of the Sn@aCT. Our strategy provides a feasible way to optimize Sn/C nanocomposite as a high-performance anode material for LIBs.