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Author

Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Comparison of overcharge behavior of AlPO42-coated LiCoO (and LiNi)(Co)(Mn)(O)(0.8)(0.1)(0.1)(2) cathode materials in Li-ion cells

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Title
Comparison of overcharge behavior of AlPO42-coated LiCoO (and LiNi)(Co)(Mn)(O)(0.8)(0.1)(0.1)(2) cathode materials in Li-ion cells
Author
Cho, JaephilKim, HPark, B
Keywords
LITHIUM SECONDARY BATTERIES; THERMAL-STABILITY; PERFORMANCE; LINIO2; LINI1-XCOXO2; ELECTROLYTE; CHEMISTRY; CO; NI
Issue Date
2004
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.151, no.10, pp.A1707 - A1711
Abstract
The overcharge behavior of AlPO4x0.80.10.12-coated LiNiCoMnO (cathodes was compared to that of AlPO)(-coated Li)(CoO)(4)(x)(2) (cathodes in Li-ion cells. The former exhibited less heat generation than the latter as the charge voltage increased. Moreover, the coated Li)(Ni)(Co)(Mn)(O)(x)(0.8)(0.1)(0.1)(2) (cathode showed two distinct sets of exothermic peaks beginning at 75 and 200C, respectively, while the coated Li)(CoO)(x)(2) (exhibited relatively continuously increasing exothermic peak beginning at 150C. The results were consistent with the 12 V overcharge tests using Li-ion full cells. As the C rate increased from 1 to 3 C, the cell-surface temperature with the AlPO)(-coated Li)(Ni)(Co)(Mn)(O)(4)(x)(0.8)(0.1)(0.1)(2) (cathode did not exceed 125C, and that of the coated Li)(CoO)(x)(2) (exceeded 170C. However, the Li-ion cells containing either cathode with the AlPO)(-nanoparticle coating did not exhibit thermal runaway, although short-circuits occurred at 12 V during a 3 C overcharging rate. It is evident that the AlPO)(4)(4)-coating layer on the powder drastically reduced the violent exothermic reaction between the electrolyte and cathode, controlling the overall safety of the Li-ion cells.
URI
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DOI
http://dx.doi.org/10.1149/1.1790511
ISSN
0013-4651
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