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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 High Capacity Porous Hard Carbons as Anode Materials for Sodium Ion Batteries

2014년 8월 28일 15시 55분 16초
MAT.P-1129 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
S.J. Richard Prabakar, 정재향, 표명호*
순천대학교 인쇄전자공학과, Korea
With significant efforts aimed at developing suitable sodium ion battery (SIB) anode, variety of options are being explored, among which, carbon based materials have distinguished themselves as a suitable and promising solution owing to their cost effectiveness, easily attainable and non-toxic properties. Hard carbon also known as disordered graphitic carbon has attracted immense attention in this regard [1] and presents enough reasons to pursue, aiming improvement. Here, we report the correlation between the degree of porosity and the reversible capacity from a sucrose derived hardcarbon (SHC) as an anode for SIB. The porosity in the SHC was regulated by varying the amount of bicarbonate salt added during the simple two stage synthetic process. Increase in porosity and surface area result in a sharp increase in reversible capacity. Conversely, a drooping effect is observed beyond an optimum level of porosity, suggesting that the pore size and material’s structure are crucial in harvesting the best capacity response from SHC. With the optimal porosity, a reversible capacity of 324 and 289 mAh/g can be obtained for the 1stand 100th cycle at 20 mA/g, in contrast to 251 and 213 mAh/g for SHC, respectively. Appending to the above, a notable distinction in solid electrolyte interphase (SEI) between the pristine and modified porous SHC (MSHC) could be perceived; implying that the type of SEI formed on the hardcarbon (dependent on the surface functional groups) may have a crucial role to play in the electrochemical reversibility and dimensional stability. The diffusion coefficient measured by electrochemical impedance spectroscopy (EIS) and potentiometric intermittent titration technique (PITT) suggested that the ionic mobility in the material is strongly dependent on the porous texture. We suggest that, with the ideal type of porosity, which can hasten the Na ion transport, enhance storage sites and facilitate the formation of a dimensionally stable SEI, a high Na ion storage can be achieved in SHC. References [1]A. Ponrouch, A.R. Goni, M. Rosa Palacin, Electrochem. Commum., 25 (2013) 85.