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Deciphering the thermal behavior of lithium rich cathode material by in situ X-ray diffraction technique
- Source :
- Journal of Power Sources. 285:156-160
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- Thermal stability is one of the critical requirements for commercial operation of high energy lithium-ion batteries. In this study, we use in situ X-ray diffraction technique to elucidate the thermal degradation mechanism of 0.5Li 2 MnO 3 -0.5LiNi 0.33 Co 0.33 Mn 0.33 O 2 lithium rich cathode material in the absence and presence of electrolyte to simulate the real life battery conditions and compare its thermal behavior with the commercial LiNi 0.33 Co 0.33 Mn 0.33 O 2 cathode material. We show that the thermal induced phase transformations in delithiated lithium rich cathode material are much more intense compared to similar single phase layered cathode material in the presence of electrolyte. The structural changes in both cathode materials with the temperature rise follow different trends in the absence and presence of electrolyte between 25 and 600 °C. Phase transitions are comparatively simple in the absence of electrolyte, the fully charged lithium rich cathode material demonstrates better thermal stability by maintaining its phase till 379 °C, and afterwards spinel structure is formed. In the presence of electrolyte, however, the spinel structure appears at 207 °C, subsequently it transforms to rock salt type cubic phase at 425 °C with additional metallic, metal fluoride, and metal carbonate phases.
- Subjects :
- Materials science
Lithium vanadium phosphate battery
Renewable Energy, Sustainability and the Environment
Spinel
Energy Engineering and Power Technology
Mineralogy
chemistry.chemical_element
Electrolyte
engineering.material
Cathode
Lithium-ion battery
law.invention
Chemical engineering
chemistry
law
Phase (matter)
engineering
Thermal stability
Lithium
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
Subjects
Details
- ISSN :
- 03787753
- Volume :
- 285
- Database :
- OpenAIRE
- Journal :
- Journal of Power Sources
- Accession number :
- edsair.doi...........47e26c25fbaf58c402d8e4599d999fdd