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Choi, Nam-Soon
Energy Materials Lab
Research Interests
  • Rechargeable lithium battery, electrolytes for next generation Mg and Na battery

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Degradation of spinel lithium manganese oxides by low oxidation durability of LiPF6-based electrolyte at 60 degrees C

Cited 10 times inthomson ciCited 7 times inthomson ci
Title
Degradation of spinel lithium manganese oxides by low oxidation durability of LiPF6-based electrolyte at 60 degrees C
Author
Choi, Nam-SoonYeon, Jin-TakLee, Yong-WonHan, Jung-GuLee, Kyu TaeKim, Sung-Soo
Keywords
Anodic limits; Disproportion reactions; LiPF 6; Lithium manganese oxide; Manganese dissolution
Issue Date
201207
Publisher
ELSEVIER SCIENCE BV
Citation
SOLID STATE IONICS, v.219, no., pp.41 - 48
Abstract
The manganese dissolution behavior of lithium hexafluorophosphate (LiPF6) dissolved in carbonate-based organic solvents is investigated by ex situ field emission scanning electron microscope (FE-SEM), Fourier transform infrared (FT-IR). X-ray diffraction (XRD), and inductively coupled plasma (ICP). It is found that the LiPF6 salt anions in the electrolytes are prone to oxidize upon contacting delithiated lithium manganese oxide with high oxidizing power and the electrons that evolved from the oxidation of anions are consumed in the reduction of tetravalent manganese ions to trivalent manganese ions at 60 degrees C. The generated trivalent manganese ions readily undergo a disproportion reaction and thereby release divalent manganese ions into the electrolytes, which leads to a capacity loss in the lithium manganese oxide cathode.
URI
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DOI
http://dx.doi.org/10.1016/j.ssi.2012.05.012
ISSN
0167-2738
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