Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 900, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163438
Keywords
Silicon-based materials; Photodeposition; Galvanic replacement; Porous silicon/tin composites; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [21373182]
Ask authors/readers for more resources
A high-performance porous Si@Sn composite material was successfully synthesized using a photo electrochemical deposition strategy, showing excellent lithium storage performance under optimized conditions.
Silicon-based anode materials with significantly improved lithium storage would play an important role in the next generation high-performance lithium-ion batteries (LIBs). Herein, a simple photo electrochemical deposition strategy is applied to synthesize a new type of porous Si@Sn composite, using the low-cost SiAl alloy microspheres as precursor. In the dark, the galvanic replacement reaction between Si and Sn2+ induces the in-situ deposition of Sn onto the porous Si microspheres. Under light illumination, both the photo-generated electrons and the electrons from the dissolution of Si lead to the reduction from Sn2+ to Sn. The porous Si@Sn microsphere composite synthesized under the conditions of light irradiation and the optimized pH (8.0) shows excellent lithium storage performance, with a reversible capacity of 1184.4 mAh g(-1) after 500 cycles at 1 A g(-1) and the first coulombic efficiency of 85.19%. This may be ascribed to the integral 3D porous Si microsphere structure with the embedding of more Sn nanoparticles. This work provides an easy and efficient strategy to design and synthesize the high-performance Si-based anode materials for LIBs. (C) 2021 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available