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공민경,( Thangavel Ranjith ),김소영,( Hari Vignesh Ramasamy ),박주연,( Balasubramaniam Ramkumar ),김현재,정강현,이윤성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We have developed a new high performing sodium hybrid capacitor (NHC) using sodium super ionic conductor NaTi<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> grown on graphene sheets (GNTP) and capacitor type carbon electrode in an organic electrolyte. The hybrid device works on two charge storage reactions that occurs simultaneously, sodium ion intercalation/deintercalation into GNTP, providing high energy, and adsorption/desorption of anion over the pores of carbon provides high power. A high energy density of 80 Wh kg<sup>-1</sup> has been achieved at a specific power of Additionally, the hybrid capacitor retains 32 Wh kg<sup>-1</sup> of energy at high specific power of 8 kW kg<sup>-1</sup>, outperforming lithium hybrid capacitors. An outstanding stability of 90% has been achieved even after 75,000 cycles. The combination of high energy at high power along with high stability emerge them as a suitable candidate for next generation high power devices.
Designing stable layered cathode material for sodium ion batteries by Aluminium doping
공민경,( Hari Vignesh Ramasamy ),( Thangavel Ranjith ),김소영,박주연,( Balasubramaniam Rankumar ),성원모,강기석,이윤성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Here, we present a comprehensive study on the influence of Al doping of Mn sites on the structural and electrochemical properties of a P2-Na<sub>0.5</sub>Mn<sub>0.5-x</sub>Al<sub>x</sub>Co<sub>0.5</sub>O<sub>2</sub> (x = 0, 0.02, or 0.05) cathode for SIBs. Detailed structural, morphological, and electrochemical investigations were carried out using X-ray diffraction, cyclic voltammetry, and galvanostatic charge-discharge measurements and some new insights are proposed. Rietveld refinement confirmed that Al doping caused TMO<sub>6</sub>-octahedra (TM= Transition metal) shrinkage, resulting in wider interlayer spacing. After optimizing the aluminum concentration, the cathode exhibited remarkable electrochemical performance, with better stability and improved rate performance. The material presented here exhibits exceptional stability over 100 cycles within a 1.5-4.3 V window, and outperforms several other Mn-Co-based cathodes for SIBs.
Surface modification using atomic layer deposition for developing high voltage sodium layered oxides
공민경,( Hari Vignesh Ramasamy ),( Thangavel Ranjith ),김소영,박주연,( Balasubramaniam Ramkumar ),이윤성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Here, we present a comprehensive study on the influence of ultrathin metal oxide coating for developing high voltage sodium layered oxides using Atomic Layer Deposition (ALD). Detailed structural, morphological, and electrochemical investigations were carried out using X-ray diffraction, cyclic voltammetry, and galvanostatic charge-discharge measurements. The ALD modified electrode exhibits exceptional stability of above 80% for 100 cycles within a 2.0-4.5V window, and outperforms several other Mn-based cathodes for SIBs. Our work presents new insights for designing structurally stable cathode for Sodium Ion Batteries (SIBs).
( Phan Tuan Ngoc ),공민경,( Ranjith Thangavel ),이윤성,고창현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We fabricated ordered mesoporous carbon materials (OMCs, CMK-3 and CMK-8) via a nano-casting method using mesoporous silica as the template materials and furfuryl alcohol (FA) as a carbon source. The OMCs showed a higher specific capacitance than the microporous carbon samples obtained by the carbonization of FA without templates. The enhancement of the specific capacitance may come from the mesopores of OMCs. The large pores and high specific surface area of OMCs are beneficial for the fast electrolyte transportation and high ion storage capability during the charge-discharge process. Moreover, CMK-3 (prepared using SBA-15) exhibited better EDLC performance than CMK-8 (prepared using KIT-6). CMK-3 possessed the long straight channels, which facilitate lower internal resistance and a larger number of ion-transport pathways than CMK-8 with the Ia3d cubic channels. The EDLC performance of carbon-based materials strongly depends on the mesopore structure and the mesoporous surface area.