Issue 24, 2024

Carbon-coated silicon/graphite oxide composites as anode materials for highly stable lithium-ion batteries

Abstract

Silicon (Si) has been widely investigated as an anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity. However, the huge volume expansion and low electrical conductivity limit its practical application to some extent. Here, we prepared silicon/reduced graphene oxide/amorphous carbon (Si/G/C) anode materials for lithium-ion batteries using a facile synergistic cladding layer. The protective effect of different carbon layers was explored and it was found that ternary composites have excellent electrochemical properties. In this work, the surface of Si was first modified using ammonia, and the positively charged Si was tightly anchored to the graphene sheet layer. In contrast, amorphous carbon was used as a reinforcing coating for further coating to synergistically build up the cladding layer of Si NPs with graphene oxide. The ternary composite (Si/G/C) material greatly ensures the structural integrity of the composites and shows excellent cycling as well as rate performance compared to Si/reduced graphene oxide and Si/carbon composites. For the Si/G/C composite, at a current density of 1 A g−1, it can be stably cycled over 267 times with 70% capacity retention (only 0.0711% capacity reduction per cycle).

Graphical abstract: Carbon-coated silicon/graphite oxide composites as anode materials for highly stable lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2024
Accepted
28 May 2024
First published
30 May 2024

Phys. Chem. Chem. Phys., 2024,26, 17292-17302

Carbon-coated silicon/graphite oxide composites as anode materials for highly stable lithium-ion batteries

L. Niu, R. Zhang, Q. Zhang, D. Wang, Y. Bi, G. Wen and L. Qin, Phys. Chem. Chem. Phys., 2024, 26, 17292 DOI: 10.1039/D4CP01424C

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