Abstract
Temperature programmed reduction (TPR) method was introduced to analyze the structural change and thermal stability of Li x CoO 2 (LCO) cathode material. The reduction peaks of delithiated LCO clearly represented the different phases of LCO. The reduction peak at a temperature below 250 °C can be attributed to the transformation of CoO 2 –like to Co 3 O 4 –like phase which is similar reduction patterns of CoO 2 phase resulting from delithiation of LCO structure. The 2 nd reduction peak at 300~375 °C corresponds to the reduction of Co 3 O 4 –like phase to CoO–like phase. TPR results indicate the thermal instability of delithiated LCO driven by CoO 2 –like phase on the surface of the delithiated LCO. In the TPR kinetics, the activation energies (E a ) obtained for as-synthesized LCO were 105.6 and 82.7 kJ mol -1 for T m_H1 and T m_H2 , respectively, whereas E a for the delithiated LCO were 93.2, 124.1 and 216.3 kJ mol -1 for T m_L1 , T m_L2 and T m_L3 , respectively. As a result, the TPR method enables to identify the structural changes and thermal stability of each phase and effectively characterize the distinctive thermal behavior between as-synthesized and delithiated LCO.
| Original language | English |
|---|---|
| Pages (from-to) | 3-12 |
| Number of pages | 10 |
| Journal | Eurasian Chemico-Technological Journal |
| Volume | 21 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 1 2019 |
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Keywords
- Lithium cobalt oxide
- Secondary battery
- Temperature programmed reduction
- Thermal stability
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)
- Condensed Matter Physics
Cite this
Thermal and structural stabilities of Li x CoO 2 cathode for li secondary battery studied by a temperature programmed reduction . / Jung, D. H.; Umirov, Nurzhan; Kim, T.; Bakenov, Zhumabay; Kim, J. S.; Kim, S. S.
In: Eurasian Chemico-Technological Journal, Vol. 21, No. 1, 01.01.2019, p. 3-12.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Thermal and structural stabilities of Li x CoO 2 cathode for li secondary battery studied by a temperature programmed reduction
AU - Jung, D. H.
AU - Umirov, Nurzhan
AU - Kim, T.
AU - Bakenov, Zhumabay
AU - Kim, J. S.
AU - Kim, S. S.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Temperature programmed reduction (TPR) method was introduced to analyze the structural change and thermal stability of Li x CoO 2 (LCO) cathode material. The reduction peaks of delithiated LCO clearly represented the different phases of LCO. The reduction peak at a temperature below 250 °C can be attributed to the transformation of CoO 2 –like to Co 3 O 4 –like phase which is similar reduction patterns of CoO 2 phase resulting from delithiation of LCO structure. The 2 nd reduction peak at 300~375 °C corresponds to the reduction of Co 3 O 4 –like phase to CoO–like phase. TPR results indicate the thermal instability of delithiated LCO driven by CoO 2 –like phase on the surface of the delithiated LCO. In the TPR kinetics, the activation energies (E a ) obtained for as-synthesized LCO were 105.6 and 82.7 kJ mol -1 for T m_H1 and T m_H2 , respectively, whereas E a for the delithiated LCO were 93.2, 124.1 and 216.3 kJ mol -1 for T m_L1 , T m_L2 and T m_L3 , respectively. As a result, the TPR method enables to identify the structural changes and thermal stability of each phase and effectively characterize the distinctive thermal behavior between as-synthesized and delithiated LCO.
AB - Temperature programmed reduction (TPR) method was introduced to analyze the structural change and thermal stability of Li x CoO 2 (LCO) cathode material. The reduction peaks of delithiated LCO clearly represented the different phases of LCO. The reduction peak at a temperature below 250 °C can be attributed to the transformation of CoO 2 –like to Co 3 O 4 –like phase which is similar reduction patterns of CoO 2 phase resulting from delithiation of LCO structure. The 2 nd reduction peak at 300~375 °C corresponds to the reduction of Co 3 O 4 –like phase to CoO–like phase. TPR results indicate the thermal instability of delithiated LCO driven by CoO 2 –like phase on the surface of the delithiated LCO. In the TPR kinetics, the activation energies (E a ) obtained for as-synthesized LCO were 105.6 and 82.7 kJ mol -1 for T m_H1 and T m_H2 , respectively, whereas E a for the delithiated LCO were 93.2, 124.1 and 216.3 kJ mol -1 for T m_L1 , T m_L2 and T m_L3 , respectively. As a result, the TPR method enables to identify the structural changes and thermal stability of each phase and effectively characterize the distinctive thermal behavior between as-synthesized and delithiated LCO.
KW - Lithium cobalt oxide
KW - Secondary battery
KW - Temperature programmed reduction
KW - Thermal stability
UR - http://www.scopus.com/inward/record.url?scp=85066024111&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85066024111&partnerID=8YFLogxK
U2 - 10.18321/ectj780
DO - 10.18321/ectj780
M3 - Article
VL - 21
SP - 3
EP - 12
JO - Eurasian Chemico-Technological Journal
JF - Eurasian Chemico-Technological Journal
SN - 1562-3920
IS - 1
ER -