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Analogous graphite carbon sheets derived from corn stalks as high performance sodium-ion battery anodes

机译：源自玉米秸秆的类似石墨碳片作为高性能钠离子电池阳极

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摘要

Biomass derived carbon (BMC) materials have attracted much attention due to their high performance and abundant sources. Herein, analogous graphite carbon sheets (AGCS) from corn stalks have been synthesized via a simple high temperature carbonization and expansion process. A morphology study showed that the obtained carbon sheets retained the natural cross-sectional honeycomb-like shape and the longitudinal hollow tubular array structure of the corn stalks, which provided abundant macropores and micropores to facilitate sodium ion transportation and electrolyte diffusion. X-ray diffraction analysis showed that the interlayer spacing of the carbon sheets is larger (0.384 nm) than that of graphite (0.335 nm), which allowed sodium ion to be de/intercalated. When used as an anode for sodium ion batteries, the sample carbonized at 1200 degrees C (AGCS-1200) showed a better sodium ion storage performance than that carbonized at 900 degrees C (BMC-900). AGCS-1200 exhibits a stable reversible capacity of 231 mA h g(-1) after 200 cycles at 0.25C (1C = 200 mA g(-1)), while the capacity value for BMC-900 was 162 mA h g(-1) after 100 cycles. What's more, a better rate capability for AGCS-1200 (232, 136 mA h g(-1)) than that of BMC-900 (125, 68 mA h g(-1)) at rates of 1C and 5C, respectively, is demonstrated. Significantly, the AGCs-1200 anode shows an excellent long-term cycling stability, which delivers a capacity of 42 mA h g(-1) after 2000 charge-discharge cycles at a very high rate of 15C.
机译：由于其高性能和丰富的来源，生物质衍生的碳（BMC）材料引起了很多关注。这里，通过简单的高温碳化和膨胀过程合成来自玉米秸秆的类似石墨碳片（AGCs）。形态学研究表明，所得碳板保留了玉米秸秆的自然横截面蜂窝状的形状和纵向中空管状阵列结构，其提供丰富的宏孔和微孔，以促进钠离子输送和电解质扩散。 X射线衍射分析表明，碳板的层间间距较大（0.384nm），比石墨（0.335nm）较大，其允许钠离子为DE /嵌入。当用作钠离子电池的阳极时，在1200℃（AGCS-1200）下碳化的样品显示出比900℃（BMC-900）的碳化的更好的离子储存性能。 AGCS-1200在0.25℃下的200次循环后表现出231mA Hg（-1）的稳定可逆容量（1c = 200 mA g（-1）），而BMC-900的容量值为162 mA Hg（-1） 100次循环后。更重要的是，AGCS-1200（232,136mA Hg（-1））分别比在1C和5C的速率下的BMC-900（125,68mA Hg（-1））的更好的速率能力。值得注意的是，AGCS-1200阳极显示出优异的长期循环稳定性，其在2000次充电放电循环以非常高的15℃下递增42mA H G（-1）的容量。

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  • 来源
    《RSC Advances》 |2016年第108期|共7页
  • 作者

    Qin Decai; Zhang Fang; Dong Shengyang; Zhao Yanzhang; Xu Guiyin; Zhang Xiaogang;

  • 作者单位

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Jiangsu Peoples R China;

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