Cathode material comparison of thermal runaway behavior of Li-ion cells at different state of charges including over charge
| Autor: | Yuki Maruyama, Omar Samuel Mendoza-Hernandez, Yuuki Nishikawa, Minoru Umeda, Hiroaki Ishikawa |
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| Rok vydání: | 2015 |
| Předmět: |
Overcharge
Materials science Thermal runaway Renewable Energy Sustainability and the Environment Open-circuit voltage Analytical chemistry Energy Engineering and Power Technology Calorimetry Internal resistance Electrochemistry Cathode law.invention Ion law Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Journal of Power Sources. 280:499-504 |
| ISSN: | 0378-7753 |
| Popis: | The analysis of Li-ion secondary cells under outstanding conditions, as overcharge and high temperatures, is important to determine thermal abuse characteristics of electroactive materials and precise risk assessments on Li-ion cells. In this work, the thermal runaway behavior of LiCoO 2 and LiMn 2 O 4 cathode materials were compared at different state of charges (SOCs), including overcharge, by carrying out accelerating rate calorimetry (ARC) measurements using 18650 Li-ion cells. Onset temperatures of self-heating reactions and thermal runaway behavior were identified, and by using these onset points thermal mapping plots were made. We were able to identify non-self-heating, self-heating and thermal runaway regions as a function of state of charge and temperature. The cell using LiMn 2 O 4 cathode material was found to be more thermally stable than the cell using LiCoO 2 . In parallel with the ARC measurements, the electrochemical behavior of the cells was monitored by measuring the OCV and internal resistance of the cells. The electrochemical behavior of the cells showed a slightly dependency on SOC. |
| Databáze: | OpenAIRE |
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