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Arie Arenst Andreas,Kristianto Hans,Cengiz Elif Ceylan,Demir-Cakan Rezan 한국탄소학회 2020 Carbon Letters Vol.30 No.2
Salacca peel-based porous carbon (SPPC) with high surface area (1945 m2 g−1) and large specifc pore volume (1.68 cm3 g−1) was prepared by pre-carbonization and K2CO3 activation method. Based on the TGA results, it can be estimated that up to 70 wt% of sulfur-active materials could be infltrated into the pores of SPPC to form SPPC/S composite cathode for LiS battery. The porous structure of SPPC could act as a bufer layer against volume expansion and minimize the shuttle efect due to the penetration of intermediate polysulfdes during cycle tests. Optimization on sulfur loading (50, 60 and 70 wt%) in SPPCC/S composite was also investigated. It was found that the SPPC/S composites with 60 wt% of sulfur loading had the best electrochemical performances. With 60 wt% of sulfur loading, SPPC/S composite electrodes showed excellent electrochemical performances in terms of high initial specifc discharge capacity of 1006 mAh g−1 at 0.5 C and capacity retention of 71% until the 100th cycle. For both cases of low and high sulfur loading, they caused much worse electrochemical performances. Based on the experimental results, it can be concluded that porous carbons derived from the salacca peel were promising materials for sulfur loading in LiS battery.
Arenst Andreas Arie,Bup-Ju Jeon,Joong-Kee Lee 한국탄소학회 2010 Carbon Letters Vol.11 No.2
Boron doped fullerene C60 (B:C60) films were prepared by the thermal evaporation of C60 powder using argon plasma treatment. The morphology and structural characteristics of the thin films were investigated by scanning electron microscope (SEM), Fourier transform infra-red spectroscopy (FTIR) and x-ray photo electron spectroscopy (XPS). The electrochemical application of the boron doped fullerene film as a coating layer for silicon anodes in lithium ion batteries was also investigated. Cyclic voltammetry (CV) measurements were applied to the B:C60 coated silicon electrodes at a scan rate of 0.05 mVs-1. The CV results show that the B:C60 coating layer act as a passivation layer with respect to the insertion and extraction of lithium ions into the silicon film electrode.
A study of Li-ion diffusion kinetics in the fullerene-coated Si anodes of lithium ion batteries
Arie, Arenst Andreas,Lee, Joong Kee Royal Swedish Academy of Sciences 2010 Physica scripta Vol.2010 No.t139
<P>The diffusion coefficient of lithium ions in fullerene-coated silicon thin film electrodes, prepared by the plasma-assisted deposition technique, was estimated by a specific electrochemical measurement known as cyclic voltammetry (CV) and then compared with that of a bare silicon film used as the anode in lithium ion batteries. Based on our experimental range, the diffusion coefficient of the fullerene-coated Si thin film was found to be ∼10<SUP>−9</SUP> cm<SUP>2</SUP> s<SUP>−1</SUP> or two orders of magnitude higher than that of the bare Si thin film (∼10<SUP>11</SUP> cm<SUP>2</SUP> s<SUP>−1</SUP>). It can be concluded that the fullerene film acts as an artificial solid electrolyte interphase (SEI) layer during charging–discharging tests.</P>
Arenst Andreas Arie,이중기 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.5
With the aim of enhancing the silicon anode performance in lithium secondary batteries, we have studied the effect of a fullerene thin film as a coating material. The fullerene films were prepared by a plasma assisted evaporation technique from fullerene powder on a Cu foil. As a result, excellent electrochemical performance of fullerene-coated silicon electrodes in terms of stable cycle performance and high specific capacity were observed. The enhanced performances are attributed to the formation of a polymeric phase of the fullerene film as confirmed by Raman spectroscopy, FTIR spectroscopy and XPS analysis. The polymeric layer could act as passive layer to provide mechanical stability against the volume expansion during prolonged cycling tests.
Fullerene C60 coated silicon nanowires as anode materials for lithium secondary batteries.
Arie, Arenst Andreas,Lee, Joong Kee American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.4
<P>A Fullerene C60 film was introduced as a coating layer for silicon nanowires (Si NWs) by a plasma assisted thermal evaporation technique. The morphology and structural characteristics of the materials were studied by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). SEM observations showed that the shape of the nanowire structure was maintained after the C60 coating and the XPS analysis confirmed the presence of the carbon coating layer. The electrochemical characteristics of C60 coated Si NWs as anode materials were examined by charge-discharge tests and electrochemical impedance measurements. With the C60 film coating, Si NW electrodes exhibited a higher initial coulombic efficiency of 77% and a higher specific capacity of 2020 mA h g(-1) after the 30th cycle at a current density of 100 microA cm(-2) with cut-off voltage between 0-1.5 V. These improved electrochemical characteristics are attributed to the presence of the C60 coating layer which suppresses side reaction with the electrolyte and maintains the structural integrity of the Si NW electrodes during cycle tests.</P>