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Browsing 02 Physical Sciences by Author "Ahn Hyojun"

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Ab initio calculations on Li-ion migration in Li2FeSiO4 cathode material with a P21 symmetry structure

Su Dawei; Ahn Hyojun; Wang Guoxiu (American Institute of Physics, 2011)

We have systematically investigated the diffusion mechanism of Li ions in Li2FeSiO4 and its delithiated product LiFeSiO4 based on the P21 symmetry using the first principle method. Calculations on the energy barriers for ...
The addition of iron to Ni3S2 electrode for sodium secondary battery

Kim Jong-Seon; Cho Gyu-Bong; Kim Kiwon; Ahn Jou-Hyeon; Wang Guoxiu; Ahn Hyojun (Elsevier Inc, 2011)

In order to investigate the role of iron additive in the Ni3S2 electrode, the Ni3S2 electrode was prepared by addition of iron. The discharge properties of Na/Ni3S2 cells using 1 M NaCF3SO3 in tetra(ethylene glycol)dimethyl ...
Electrochemical properties of Na/Ni3S2 cells with liquid electrolytes using various sodium salts

Kim Jong-Seon; Lee Sang-Won; Liu Xiaojing; Cho Gyu-Bong; Kim Kiwon; Ahn In-Shup; Ahn Jou; Wang Guoxiu; Ahn Hyojun (Elsevier Inc, 2011)

For a Na/Ni3S2 cell operating at room temperature, three kinds of tetra (ethylene glycol) dimethyl ether (TEGDME) electrolytes, containing sodium trifluoromethane sulfonate (NaCF3SO3), sodium hexafluorophosphate (NaPF6), ...
First-principles study on the enhancement of lithium storage capacity in boron doped graphene

Wang Xianlong; Zeng Zhi; Ahn Hyojun; Wang Guoxiu (American Institute of Physics, 2009)

The adsorption of Li ions on boron doped graphene was investigated using a first-principles method. Our results show that, as boron doping turns graphene into an electron-deficient system, more Li ions can be captured ...
Graphene-supported SnO2 nanoparticles prepared by a solvothermal approach

Wang Bei; Su Dawei; Park Jinsoo; Ahn Hyojun; Wang Guoxiu (Springer New York LLC, 2012)

SnO2 nanoparticles were dispersed on graphene nanosheets through a solvothermal approach using ethylene glycol as the solvent. The uniform distribution of SnO2 nanoparticles on graphene nanosheets has been confirmed by ...
In situ synthesis of Co(3)O(4)/graphene nanocomposite material for lithium-ion batteries and supercapacitors with high capacity and supercapacitance

Wang Bei; Wang Ying; Park Jinsoo; Ahn Hyojun; Wang Guoxiu (Elsevier Science, 2011)

Abstract: Co(3)O(4)/graphene nanocomposite material was prepared by an in situ solution-based method under reflux conditions. In this reaction progress, Co(2+) salts were converted to Co(3)O(4) nanoparticles which were ...
LiNi0.4Co0.3Mn0.3O2 thin film electrode by aerosol deposition

Kim Icpyo; Nam Tae-Hyun; Kim Ki-Won; Ahn Jou-Hyeon; Park Dong-Soo; Ahn Cheolwoo; Chun Byong; Wang Guoxiu; Ahn Hyojun (Springer New York LLC, 2012)

LiNi0.4Co0.3Mn0.3O2 thin film electrodes are fabricated from LiNi0.4Co0.3Mn0.3O2 raw powder at room temperature without pretreatments using aerosol deposition that is much faster and easier than conventional methods such ...

Now showing items 1-7 of 7

Browsing 02 Physical Sciences by Author "Ahn Hyojun"

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Browsing 02 Physical Sciences by Author "Ahn Hyojun"