Comparison of reduction products from graphite oxide and graphene oxide for anode applications in lithium-ion batteries and sodium-ion batteries
Comparison of reduction products from graphite oxide and graphene oxide for anode applications in lithium-ion batteries and sodium-ion batteries
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用于锂离子电池和钠离子电池阳极的氧化石墨和氧化石墨烯还原产物的比较
DOI：
10.1039/c6nr07650e
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发表时间：
2017-02-21
期刊：
影响因子：
6.7
通讯作者：
Qin, Lu-Chang
中科院分区：
文献类型：
--
作者：
Sun, Yige;Tang, Jie;Qin, Lu-Chang
合成了肼还原氧化石墨和氧化石墨烯，比较了它们作为锂离子电池和钠离子电池负极材料的性能。还原氧化石墨继承了石墨的层状结构，相邻层间的平均间距（d-spacing）为0.374 nm；这超过了石墨的d-间距（0.335 nm）。较大的d间距为材料中锂离子和钠离子的输送提供了更宽的通道。我们发现，还原氧化石墨作为锂离子电池的阳极可以达到917 mA h g（-1）的比容量，这大约是电极上LiC6结构预期值372 mA h g（-1）的三倍。这种增加与更宽的d间距一致，d间距增强了锂在电极上的嵌入和去嵌入。与还原氧化石墨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。这一改进表明，还原氧化石墨层间距更大，缺陷更少，因此更稳定。总之，我们发现还原氧化石墨可能是一种更有利的石墨烯形式，用于制造锂离子和钠离子电池以及其他储能设备的电极。
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(-1), which is about three times of 372 mA h g(-1), the value expected for the LiC6 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.