課題番号 ：S-16-NM-0084
利用形態 ：機器利用
利用課題名（日本語） ：ナノカーボン複合材料キャパシターに関する研究
Program Title (English) ：
利用者名（日本語） ：
Username (English) ：Sun Yige
所属名（日本語） ：筑波大学　数理物質科学研究科
Affiliation (English) ：

１．概要（Summary）
The graphene nanosheets combined with single wall carbon nanotube (SWCNT) -SWCNT/Graphene has been synthesized to form 3-D structure. Taking advantage of the 3-D structure electrode material, this dual-graphene LIC has exhibited high energy density. Transmission electron microscopy (TEM) and Raman are used to characterize the structure and morphology of SG.
The parallel-layered graphene (PLG) has been formed as the anode electrode of LIB, which exhibit outstanding electrochemical performance. TEM and Raman are used to characterize the structure and morphology of PLG.
The parallel-layered graphene was combined with MoS2 as the anode electrode of LIB and SIB, which exhibit high specific capacity. TEM and Raman are used to analysis the structure and morphology of the sample.
２．実験（Experimental）
【利用した主な装置】
 Laser Raman Microscope
Platform staffs provided enough instructions and supports to use this instrument.
【実験方法】
The graphite oxide (GO) has been synthesized from graphite through a modified Hummers method. Then the SWCNT@ Graphene (SG) sample compound with single wall carbon nanotubes was prepared.
After forming the Graphite oxide, the PLG is formed through reduction.
The PLG and MoS2 were co-reduced to form a 3-D structure electrode material

３．結果と考察 （Results and Discussion）
The Figure shows the TEM images. Negatively charged GO and SDBS functionalized SWNTs were well dispersed and a uniform suspension was formed. In the structure the SWNTs were in between the graphene sheets resulting in a homogeneous SWNT/graphene composite, which have avoided the restacking of graphene and increased the conductivity. This electrode material has exhibited well electrical double layer capacitor behavior with a capacitance of more than 100 F/g, which can be used as the cathode electrode material. After lithium intercalation, the capacity of this electrode material has been up to 500 mAh/g, which is far more than commonly used graphite and can be used as anode electrode material. By combining the advantage of this electrode material together, the formed lithium-ion capacity could achieve high energy density as well as high power density.

Figure 1. The TEM image of SWCNT@ Graphene (SG) sample.

The figure shows the TEM images. The multiple layered PLG has been shown. The structure has kept the parallel structure of graphite parent material with a larger inter-layer spacer and less defect which could keep improve the even fully intercalation and de-intercalation of lithium and lead to a high capacity up to 700 mAh/g as well as good rate and cycling performance.

Figure 2. The TEM image of PLG sample.

From the TEM image, it can be observed that the MoS2 nano-sheets on the surface of POG. This combination can prohibit the restacking and lead to high specific capacity of 1319 mAh g-1.

Figure 3. The TEM image of parallel-layered graphene combined with MoS2 sample.

４．その他・特記事項（Others）

５．論文・学会発表（Publication/Presentation）
(1) 学会発表: Yige Sun, Jie Tang, et al. The Asymmetric Dual-graphene Lithium-ion Capacitors (LIC) with High Energy Density. The 5th Annual Conference of the Flinders Centre for Nano Scale Science and Technology .2016/06/14
(2)学会発表: Yige Sun, Jie Tang, et al. The Asymmetric Dual-graphene Lithium-ion Capacitors (LIC) with High Energy Density. Tsukuba Global Science Week (TGSW).2016/09/17
(3)論文: Yige Sun, Jie Tang, et al.. Comparison of the Reduction Productions of Graphite Oxide and Graphene Oxide as Anode in Lithium-ion Batteries and Sodium-ion Batteries. Nanoscale. Accept. DOI: 10.1039/C6NR07650E.
(4) 論文: Jing Li, Jie Tang, Jinshi Yuan, Kun Zhang, Qingguo Shao, Yige Sun, Lu-Chang Qin. Interactions between Graphene and Ionic Liquid Electrolyte in Supercapacitors. Electrochimica Acta., 197 (2016) 197, 84-91.
(5)論文: Jiabin Wang, Han Zhang, Michael R C Hunt, Alasdair Charles, Jie Tang, Oana Bretcanu, David Walker, Khalil T Hassan, Yige Sun, L. Šiller.Synthesis and Characterisation of Reduced Graphene Oxide/Bismuth Composite for Electrodes in Electrochemical Energy Storage Devices. ChemSusChem. DOI: 10.1002/cssc.201601553.
(6) 論文: Qingguo Shao, Jie Tang, Yige Sun, et al.. Unique interconnected graphene/ SnO2 nanoparticle spherical multilayers for lithium-ion battery applications. Nanoscale. Accepted.

６．関連特許（Patent）
(1) 唐捷, 孫一歌, 張坤, 秦禄昌.グラフェンシートを用いた電極活物質、その製造方法、それを用いたアノード電極材料、および、それを用いたリチウムイオン二次電池 . 出願人: 国立研究開発法人物質・材料研究機構. 出願番号:特願2016-174421. 出願日: 2016年9月7日. 整理番号: 16-MS-044F. Japanese patent