还原氧化石墨烯(RGO)/硅复合材料的制备及用作锂离子电池负极的电化学性能

doi:10.11896/cldb.201906003

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Abstract This contribution presents the preparation and electrochemical performance of a series of reduced graphene oxide (RGO)/silicon network structured composites, which differ in RGO/Si ratio and are expected to serve as anode materials for Li-ion batteries. The preparation of the composites involved a combination of several methods such as ultrasonic exfoliation, electrostatic self-assembly, magnetic stirring and high temperature reduction, within an alkaline circumstance and from the graphene oxide (GO) which had been obtained by a modified Hummers method using natural flake graphite powders. The microstructure and relevant characteristics of the prepared RGO/Si composites was characterized and analyzed by means of XRD, SEM, TEM, energy dispersive X-ray microanalysis (EDX), and specific surface area analysis. And the electrochemical performance test was conducted under room temperature and various current densities. The experimental results showed that the prepared RGO/Si composites have a network structure, in which silicon microparticles distribute uniformly in the RGO networks. Moreover, the RGO/Si composites with RGO-to-Si ratios of 2∶1 and 1∶1 displayed relatively satisfactory electrochemical performances compared with the samples with RGO-to-Si ratios of 1∶4, 1∶2 and 4∶1. The RGO/Si (2∶1) composite has a specific capacity of 1 231 mAh/g and a coulomb efficiency of 90.9% for the first cycle, as well as a reversible capacity retaining above 452 mAh/g and a Coulombic efficiency of 99.2% within 20 cycles. The RGO/Si (1∶1) composite was observed to have the most compact RGO lamellar coated onto Si microparticles and the most stable network structure, so that it exhibited high capacity retention abilities at high current density.

Key words： Li ion battery anode materials reduced graphene oxide composites electrochemical performance ultrasonic exfoliation electrostatic self-assembly

Published: 03 April 2019

CLC number:

TB332

Fund:This work was financially supported by the National Natural Science Foundation of China (51774175) and the Natural Science Foundation Key Project-Mate-rials Joint Foundation of Liaoning Province (20180510034).

About author:: Ming Wangreceived his B.E. degree in Materials Science and Engineering from Northeastern University in July 2005 and received his Ph.D degree in Materials Science from Institute of Metal Research and Northeastern University in July 2011.

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	WANG Ming
	HUANG Haixu
	QI Pengtao
	LIU Lei
	WANG Xuelei
	YANG Shaobin

Cite this article:

WANG Ming,HUANG Haixu,QI Pengtao, et al. Reduced Graphene Oxide (RGO)/Silicon Network Structured Composites: Preparation and Electrochemical Performance as Anode Materials for Li-ion Batteries[J]. Materials Reports, 2019, 33(6): 927-931.

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http://www.mater-rep.com/EN/10.11896/cldb.201906003 OR http://www.mater-rep.com/EN/Y2019/V33/I6/927

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