Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 627, Issue -, Pages 151-159Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.06.149
Keywords
Silicon-based anode; PAA; Porous silicon; Magnesium thermal reduction; Si/C
Categories
Funding
- National Natural Science Foundation of China [U20A200201, 21805198, 21878195, 21805018]
- Distinguished Young Scholars of Sichuan Province [2020JDJQ0027]
- Research Foundation for the Sichuan Univer- sity, and Zigong City Joint research project [2018CDZG16]
- Research Foundation for the Sichuan University
- Zigong City Joint research project [2018CDZG16]
- Sichuan University
- Zigong Municipal People's Government [2020CDZG-09]
- State Key Laboratory of Polymer Materials Engineering [sklpme2020-3-02]
- Sichuan Provincial Department of Science and Technology [2020YFG0471, 2020YFG0022]
- Sichuan Province Science and Technology Achievement Transfer and Transformation Project [21ZHSF0111]
- Sichuan University postdoctoral interdisciplinary Innovation Fund [2021SCU12084]
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In this study, a mesoporous Si/C composite with superior Li storage properties was proposed. Through a series of preparation steps, the cycling stability and rate capability of the material were significantly enhanced while ensuring volume stability, which provides inspiration for the commercialization of silicon-based anodes.
The application value of silicon-based anodes has not been fully realized due to the ti 300% volume expansion and poor electronic conductivity. In present study, mesoporous Si/C (MP-Si/C) composite with nanosized primary particles of 30-50 nm and pore diameter of 20-40 nm was proposed, which displays superior Li storage properties. Firstly, Polyacrylic acid (PAA) was applied to fulfill in-situ carbon coating and inhibit the particle growth of SiO2 generated from tetraethyl orthosilicate (TEOS) in stober reaction. Secondly, Mg gas was introduced to create nano-sized Si with meso-pores and three-dimensional carbon network via the gas-cutting effect. The cycling stability and rate capability were both significantly enhanced with capacity of 671 mAh/g after 400 cycles and 593 mAh/g after 500 cycles at 2 A/g and 4 A/g, respectively, which was highly relevant to the selection of carbon source PAA and its corresponding carbon coating and Mg reduction effect. Moreover, this method bypasses the use of costly nano-silicon, which provides inspiration for the commercialization of silicon-based anodes. (C) 2022 Elsevier Inc. All rights reserved.
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