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比较氧化石墨和氧化石墨烯还原产物在锂离子电池和钠离子电池中的应用。

Comparison of reduction products from graphite oxide and graphene oxide for anode applications in lithium-ion batteries and sodium-ion batteries.

机构信息

National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan.

Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, Missouri 64110, USA.

出版信息

Nanoscale. 2017 Feb 16;9(7):2585-2595. doi: 10.1039/c6nr07650e.

Abstract

Hydrazine-reduced graphite oxide and graphene oxide were synthesized to compare their performances as anode materials in lithium-ion batteries and sodium-ion batteries. Reduced graphite oxide inherits the layer structure of graphite, with an average spacing between neighboring layers (d-spacing) of 0.374 nm; this exceeds the d-spacing of graphite (0.335 nm). The larger d-spacing provides wider channels for transporting lithium ions and sodium ions in the material. We showed that reduced graphite oxide as an anode in lithium-ion batteries can reach a specific capacity of 917 mA h g, which is about three times of 372 mA h g, the value expected for the LiC structures on the electrode. This increase is consistent with the wider d-spacing, which enhances lithium intercalation and de-intercalation on the electrodes. The electrochemical performance of the lithium-ion batteries and sodium-ion batteries with reduced graphite oxide anodes show a noticeable improvement compared to those with reduced graphene oxide anodes. This improvement indicates that reduced graphite oxide, with larger interlayer spacing, has fewer defects and is thus more stable. In summary, we found that reduced graphite oxide may be a more favorable form of graphene for the fabrication of electrodes for lithium-ion and sodium-ion batteries and other energy storage devices.

摘要

水合肼还原氧化石墨和氧化石墨烯,以比较它们作为锂离子电池和钠离子电池阳极材料的性能。还原氧化石墨继承了石墨的层状结构,相邻层之间的平均间距(d 间距)为 0.374nm;这超过了石墨的 d 间距(0.335nm)。较大的 d 间距为材料中锂离子和钠离子的传输提供了更宽的通道。我们表明,还原氧化石墨作为锂离子电池的阳极,其比容量可达 917mAh/g,是电极上 LiC 结构预期值 372mAh/g 的约三倍。这种增加与较宽的 d 间距一致,这增强了电极上的锂离子插层和脱插层。与还原氧化石墨烯阳极的锂离子电池和钠离子电池相比,还原氧化石墨阳极的电化学性能有明显改善。这种改善表明,具有较大层间距的还原氧化石墨具有更少的缺陷,因此更加稳定。总之,我们发现还原氧化石墨可能是一种更有利于制造锂离子和钠离子电池及其他储能设备电极的石墨烯形式。

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