Thermal stability of the interface between discharged non-graphitizable carbon and electrolyte for lithium-ion batteries

Takayuki Doi, Liwei Zhao, Shigeto Okada, Jun ichi Yamaki

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The thermal stability of a non-graphitizable carbon electrode was studied quantitatively by differential scanning calorimetry (DSC). Charged non-graphitizable carbon electrode powder gave exothermic peaks at around 300 °C and the heat values varied depending on the ratio of the electrode powder to coexisting electrolyte solution. Based on the similarities in the exothermic behaviors of charged graphite and non-graphitizable carbon electrodes, the exothermic reactions at around 300 °C should be assigned to the reductive decomposition of a surface film by charged non-graphitizable carbon. On the other hand, non-graphitizable carbon electrode powder showed exothermic reactions at around 290 °C even at a discharged state, while almost no exothermic heat was seen for a discharged graphite electrode powder at temperatures above 250 °C. The heat values decreased as Li-ions in the non-graphitizable carbon electrode were extracted. Based on the present results and a consideration of the slow diffusion and irreversible trapping of Li-ions in non-graphitizable carbon, Li-ions remaining in non-graphitizable carbon could induce exothermic reactions at around 290 °C, even at a discharged state.

Original languageEnglish
Pages (from-to)894-900
Number of pages7
JournalCarbon
Volume47
Issue number3
DOIs
Publication statusPublished - Mar 1 2009

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Electrolytes
Thermodynamic stability
Carbon
Powders
Electrodes
Exothermic reactions
Ions
Graphite electrodes
Graphite
Lithium-ion batteries
Differential scanning calorimetry
Decomposition
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Thermal stability of the interface between discharged non-graphitizable carbon and electrolyte for lithium-ion batteries. / Doi, Takayuki; Zhao, Liwei; Okada, Shigeto; Yamaki, Jun ichi.

In: Carbon, Vol. 47, No. 3, 01.03.2009, p. 894-900.

Research output: Contribution to journalArticle

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AB - The thermal stability of a non-graphitizable carbon electrode was studied quantitatively by differential scanning calorimetry (DSC). Charged non-graphitizable carbon electrode powder gave exothermic peaks at around 300 °C and the heat values varied depending on the ratio of the electrode powder to coexisting electrolyte solution. Based on the similarities in the exothermic behaviors of charged graphite and non-graphitizable carbon electrodes, the exothermic reactions at around 300 °C should be assigned to the reductive decomposition of a surface film by charged non-graphitizable carbon. On the other hand, non-graphitizable carbon electrode powder showed exothermic reactions at around 290 °C even at a discharged state, while almost no exothermic heat was seen for a discharged graphite electrode powder at temperatures above 250 °C. The heat values decreased as Li-ions in the non-graphitizable carbon electrode were extracted. Based on the present results and a consideration of the slow diffusion and irreversible trapping of Li-ions in non-graphitizable carbon, Li-ions remaining in non-graphitizable carbon could induce exothermic reactions at around 290 °C, even at a discharged state.

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