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SnO2 Nanospheres Dispersed in the Framework of Activated Carbon and Graphene as a High Performance Anode Material for Lithium-Ion Batteries
ISSN: 0148-7191, e-ISSN: 2688-3627
Published December 14, 2020 by SAE International in United States
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Among known electrochemical batteries, Lithium-ion batteries are best suited for portable electronics and electric vehicles because of their highest gravimetric and volumetric energy density. The anode materials used so far in commercial lithium-ion batteries are still graphite, but its specific capacity has been unable to meet the market demand. SnO2 is a promising alternative due to its high specific capacity with 782 mAh/g, but there are many bottlenecks when it is used as anode material solely, such as poor electrical conductivity, high volume change rate. In order to suppress these deficiencies, porous nano-sized SnO2/graphene/activated carbon (CAC/GN/SnO2) composites with high electrochemical performance are prepared via hydrothermal method followed by a facile calcination. The microstructures and morphology as well as electrochemical performance of the CAC/GN/SnO2 composites were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and relevant electrochemical characterization. The results show that the SnO2 nanospheres with a diameter of 5.68 nm are embedded in the framework of graphene and activated carbon, the mass ratios of SnO2 to carbon have a significant effect on the properties of the composites. The sample with about 60% SnO2 exhibiting a stable capacity of 875.2 mAh/g even after 100 cycles at a current density of 200 mA/g. After 60 cycles at different specific currents from 200 to 2000 mA/g, the reversible specific capacity was still maintained at 804.3 mAh/g at the current of 200 mA/g. Therefore, the CAC/GN/SnO2 composites can be a desirable alternative anode material for lithium ion batteries.
CitationPan, F., Li, B., Gao, Y., and Gong, D., "SnO2 Nanospheres Dispersed in the Framework of Activated Carbon and Graphene as a High Performance Anode Material for Lithium-Ion Batteries," SAE Technical Paper 2020-01-5118, 2020, https://doi.org/10.4271/2020-01-5118.
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