Abstract
To understand the kinetics of the reaction products (Li-Si alloys, Li 2O and Li4 SiO4) in SiOx anodes for Li-ion batteries, the irreversible behavior of the batteries is studied while controlling the amount of Li-ion insertion at various current densities. SiOx is charged when the amount of Li inserted into SiOx is varied (0.1, 0.2, 0.5, and 4 mol per 1 mol of SiOx, also called "mole control") and is discharged to 1.5 V at various Crates. The irreversible capacity of SiOx increases at high mole rate, but decreases at high Crates. To observe the formation of the reaction products after mole control at various current densities, impedance and X-ray photoelectron spectroscopy are used. Also, the relative quantity of irreversible products (Li4SiO4) after mole control at various current densities is detected by Fast Fourier transform (FFT). Upon evaluating the dQ/dV curves, it was determined that the elevated rate of the overpotential of the irreversible products (Li2O, Li4SiO4) was higher than that of the reversible products (Li-Si alloys) as the current density increased. The use of the Butler-Volmer equation shows that the activation energy of the reaction products is affected by the current density, which changes the irreversible capacity of SiOx during cycling.
| Original language | English |
|---|---|
| Journal | Journal of the Electrochemical Society |
| Volume | 161 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2014 Jan 1 |
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ASJC Scopus subject areas
- Electrochemistry
- Electronic, Optical and Magnetic Materials
- Materials Chemistry
- Surfaces, Coatings and Films
- Renewable Energy, Sustainability and the Environment
- Condensed Matter Physics
Cite this
Kinetics of reaction products of silicon monoxide with controlled amount of li-ion insertion at various current densities for li-ion batteries. / Lee, Jun Kyu; Yoon, Wooyoung; Kim, Bok Ki.
In: Journal of the Electrochemical Society, Vol. 161, No. 6, 01.01.2014.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Kinetics of reaction products of silicon monoxide with controlled amount of li-ion insertion at various current densities for li-ion batteries
AU - Lee, Jun Kyu
AU - Yoon, Wooyoung
AU - Kim, Bok Ki
PY - 2014/1/1
Y1 - 2014/1/1
N2 - To understand the kinetics of the reaction products (Li-Si alloys, Li 2O and Li4 SiO4) in SiOx anodes for Li-ion batteries, the irreversible behavior of the batteries is studied while controlling the amount of Li-ion insertion at various current densities. SiOx is charged when the amount of Li inserted into SiOx is varied (0.1, 0.2, 0.5, and 4 mol per 1 mol of SiOx, also called "mole control") and is discharged to 1.5 V at various Crates. The irreversible capacity of SiOx increases at high mole rate, but decreases at high Crates. To observe the formation of the reaction products after mole control at various current densities, impedance and X-ray photoelectron spectroscopy are used. Also, the relative quantity of irreversible products (Li4SiO4) after mole control at various current densities is detected by Fast Fourier transform (FFT). Upon evaluating the dQ/dV curves, it was determined that the elevated rate of the overpotential of the irreversible products (Li2O, Li4SiO4) was higher than that of the reversible products (Li-Si alloys) as the current density increased. The use of the Butler-Volmer equation shows that the activation energy of the reaction products is affected by the current density, which changes the irreversible capacity of SiOx during cycling.
AB - To understand the kinetics of the reaction products (Li-Si alloys, Li 2O and Li4 SiO4) in SiOx anodes for Li-ion batteries, the irreversible behavior of the batteries is studied while controlling the amount of Li-ion insertion at various current densities. SiOx is charged when the amount of Li inserted into SiOx is varied (0.1, 0.2, 0.5, and 4 mol per 1 mol of SiOx, also called "mole control") and is discharged to 1.5 V at various Crates. The irreversible capacity of SiOx increases at high mole rate, but decreases at high Crates. To observe the formation of the reaction products after mole control at various current densities, impedance and X-ray photoelectron spectroscopy are used. Also, the relative quantity of irreversible products (Li4SiO4) after mole control at various current densities is detected by Fast Fourier transform (FFT). Upon evaluating the dQ/dV curves, it was determined that the elevated rate of the overpotential of the irreversible products (Li2O, Li4SiO4) was higher than that of the reversible products (Li-Si alloys) as the current density increased. The use of the Butler-Volmer equation shows that the activation energy of the reaction products is affected by the current density, which changes the irreversible capacity of SiOx during cycling.
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UR - http://www.scopus.com/inward/citedby.url?scp=84904809064&partnerID=8YFLogxK
U2 - 10.1149/2.040406jes
DO - 10.1149/2.040406jes
M3 - Article
VL - 161
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 6
ER -