Thermal and Structural Stabilities of LixCoO2 cathode for Li Secondary Battery Studied by a Temperature Programmed Reduction

Authors

  • D.-H. Jung Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
  • N. Umirov Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
  • T. Kim Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
  • Z. Bakenov National Laboratory Astana, School of Engineering, Nazarbayev University, 53, Kabanbay Batyr Ave., Astana 010000, Kazakhstan
  • J.-S. Kim Samsung SDI, 467 Beonyeong-ro, Seobuk-gu, Cheonan-si, Chungcheongnam-do 331-300, Republic of Korea
  • S.-S. Kim Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea; National Laboratory Astana, School of Engineering, Nazarbayev University, 53, Kabanbay Batyr Ave., Astana 010000, Kazakhstan

DOI:

https://doi.org/10.18321/ectj780

Keywords:

thermal stability, temperature programmed reduction, lithium cobalt oxide, secondary battery

Abstract

Temperature programmed reduction (TPR) method was introduced to analyze the structural change and thermal stability of LixCoO2 (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 CoO2–like to Co3O4–like phase which is similar reduction patterns of CoO2 phase resulting from delithiation of LCO structure. The 2nd reduction peak at 300~375 °C corresponds to the reduction of Co3O4–like phase to CoO–like phase. TPR results indicate the thermal instability of delithiated LCO driven by CoO2–like phase on the surface of the delithiated LCO. In the TPR kinetics, the activation energies (Ea) obtained for as-synthesized LCO were 105.6 and 82.7 kJ mol-1 for Tm_H1 and Tm_H2, respectively, whereas Ea for the delithiated LCO were 93.2, 124.1 and 216.3 kJ mol-1 for Tm_L1, Tm_L2 and Tm_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.

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Published

2019-02-20

How to Cite

Jung, D.-H., Umirov, N., Kim, T., Bakenov, Z., Kim, J.-S., & Kim, S.-S. (2019). Thermal and Structural Stabilities of LixCoO2 cathode for Li Secondary Battery Studied by a Temperature Programmed Reduction. Eurasian Chemico-Technological Journal, 21(1), 3–12. https://doi.org/10.18321/ectj780

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