
摘要:本文以氯化亚锡和氧化石墨烯为原料,采用先水热后煅烧的方法合成了氧化锡/石墨烯纳米复合材料,通过透射电镜和XRD分析了复合材料的微观尺寸和结构特征。采用循环伏安以及恒流充放电测试了材料的充放电特征电位,及其可逆容量和循环寿命。结果表明,与石墨烯复合之后,氧化锡的电化学性能得以明显提升,经过20次循环之后可逆容量还能保持在726.6 mAh·g-1,且后期基本不在衰减。
Abstract: Tin oxide
/graphene composite was synthesized by hydrothermal method followed by a calcination
process. The particle size and structure of the product are characterized by Transmission
Electron Microscopy (TEM) and XRD analysis. The electrochemical properties of
the SnO2/graphene composite are examined by galvanostatical method
and cyclic voltammetry (CV). When used as anode material in the lithium ion
battery the SnO2/graphene composite shows an enhanced cyclic
performance and lithium ion storage capability. The first discharge capacity of
the composite can reach 1635mAh·g-1 with a reversible capacity of 1006.4mAh·g-1.
The composite can also deliver a reversible capacity of as high as 726.6mAh·g-1
after 20 charge-discharge cycles. These results indicate that the Tin oxide /graphene
composite synthesized by this method is a promising anode material for
lithium-ion batteries.
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