Effects of metal oxide coatings on the thermal stability and electrical performance of LiCoCO 2 in a Li-ion cell

A study is made of the effects of MgO and Al 2O 3 coatings on the electrical properties of LiCoO 2 cathode material on the thermal stability (differential scanning calorimetry (DSC)) of the charged cathode, and on the safety characteristics of 18650 Li-ion cells. Powdery active material is coated wi...

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Bibliographic Details
Published inJournal of power sources Vol. 126; no. 1; pp. 156 - 162
Main Authors Kweon, Ho-Jin, Park, JeonJoon, Seo, JunWon, Kim, GeunBae, Jung, BokHwan, Lim, Hong S.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2004
Subjects
Al 2O 3 coating
Cycle-life
Li-ion battery
MgO coating
Rate capability
Safety
MgO coating
Li-ion battery
Al 2O 3 coating
Safety
Cycle-life
Rate capability
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Summary:A study is made of the effects of MgO and Al 2O 3 coatings on the electrical properties of LiCoO 2 cathode material on the thermal stability (differential scanning calorimetry (DSC)) of the charged cathode, and on the safety characteristics of 18650 Li-ion cells. Powdery active material is coated with Mg or Al alkoxide solutions followed by heat treatment in air at temperatures between 300 and 800 °C. The presence of the coating is confirmed by an elemental depth-profile analysis of the powder surface using secondary ion mass spectroscopy (SIMS) and X-ray photoelectron spectroscopy (XPS). Both oxide coatings, especially the Al 2O 3 coating, substantially improve the charge–discharge voltage characteristics, rate capability, capacity and rate-capability retention on cycling and thermal stability of the LiCoO 2 cathode. These beneficial effects are demonstrated in 18650 Li-ion cells.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2003.08.037