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A Hollow Silicon Nanosphere/Carbon Nanotube Composite as an Anode Material for Lithium-Ion Batteries

Authors :
Hao Tang
Yuanyuan Xu
Li Liu
Decheng Zhao
Zhen Zhang
Yutong Wu
Yi Zhang
Xiang Liu
Zhoulu Wang
Source :
Coatings; Volume 12; Issue 10; Pages: 1515
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Silicon possesses a high theoretical specific capacity and is a promising high-performance anode material for lithium-ion batteries (LIBs). However, it shows a poor cycling performance because of volume expansion. A hollow structure can improve Si cycling performance, and the template method is one of the most common methods for hollow micro/nanosphere preparation. A polystyrene (PS) microsphere has the advantages of having a uniform and controllable particle size, easy modification, and high stability, thus being an ideal template for preparing hollow structure material. Herein, PS microspheres are used as templates to obtain hollow silica spheres, and then obtain hollow silicon spheres with an inner pore diameter of ~50 nm by a magnesium thermal reduction method. Lithium-ion battery anode material is obtained using carbon nanotubes supporting hollow silicon spheres (Si-CNTs). Si-CNTs exhibit excellent cycling performance (1188 mAh g−1 after 200 cycles) and excellent rate capability (484 mAh g−1 at 1 A g−1). Hollow porous Si-CNTs show great potential, providing a promising idea for solving the volume expansion problem of Si.

Details

ISSN :
20796412
Volume :
12
Database :
OpenAIRE
Journal :
Coatings
Accession number :
edsair.doi.dedup.....1dabfbbb19ef7bd0b9b4ce4a254236d9
Full Text :
https://doi.org/10.3390/coatings12101515