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      https://www.ias.ac.in/article/fulltext/boms/043/0073

    • Keywords

       

      Mesoporous MnO$_2$; KIT-6; expanded graphite; Li-ion battery.

    • Abstract

       

      A mesoporous manganese dioxide (MnO$_2$)/expanded graphite (EG) composite was successfully fabricated using mesoporous silica decorated EG (KIT-6/EG) as a hard template. Different amounts of EG were introduced to thesynthetic system to adjust the MnO$_2$:EG mass ratio of the composite. X-ray diffraction, transmission electron microscopy, scanning electron microscopy and nitrogen adsorption–desorption analyses were employed to characterize the structure and morphology of the composite. Results show that the distribution of MnO$_2$ nanoparticles grown on the EG layers decreases gradually with increasing EG content. Moreover, in the presence of excess EG, the specific surface area of the samples dramatically decreases. As the anode electrode of a Li-ion battery (LIB), the composite (MnO$_2$:EG $=$ 34% w/w) exhibitsa specific capacity of $\sim$250 mAh g$^{−1}$ at a current density of 200 mA g$^{−1}$ for up to 100 cycles, this capacity is much higher than that of pure MnO$_2$ ($\sim$10 mAh g$^{−1}$) due to its improved electrical conductivity. The composite also shows good rating performance when the current density is tuned. These results indicate that the composite has potential application as ananode material for next-generation LIBs.

    • Author Affiliations

       

      YAN LIN1 XIE LIU1 XIAO-QIN LIU2 LIN-BING SUN2 FENG CHEN1 CHENGBAO LIU1 ZHENGYING WU1 ZHIGANG CHEN1

      1. Jiangsu Key Laboratory for Environment Functional Materials, School of Chemistry, Biology and Material Engineering, Suzhou University of Science and Technology, 1 Kerui Road, Suzhou 215009, People’s Republic of China
      2. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, People’s Republic of China
    • Dates

       
  • Bulletin of Materials Science | News

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