Silicon/Graphite/Amorphous Carbon as Anode Materials for Lithium Secondary Batteries.

Molecules

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.

Published: January 2023

Although silicon is being researched as one of the most promising anode materials for future generation lithium-ion batteries owing to its greater theoretical capacity (3579 mAh g), its practical applicability is hampered by its worse rate properties and poor cycle performance. Herein, a silicon/graphite/amorphous carbon (Si/G/C) anode composite material has been successfully prepared by a facile spray-drying method followed by heating treatment, exhibiting excellent electrochemical performance compared with silicon/amorphous carbon (Si/C) in lithium-ion batteries. At 0.1 A g, the Si/G/C sample exhibits a high initial discharge capacity of 1886 mAh g, with a high initial coulombic efficiency of 90.18%, the composite can still deliver a high initial charge capacity of 800 mAh g at 2 A g, and shows a superior cyclic and rate performance compared to the Si/C anode sample. This work provides a facile approach to synthesize Si/G/C composite for lithium-ion batteries and has proven that graphite replacing amorphous carbon can effectively improve the electrochemical performance, even using low-performance micrometer silicon and large size flake graphite.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9865035PMC
http://dx.doi.org/10.3390/molecules28020464DOI Listing

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