Synergies in Blended LiMn2O4and Li[Ni1/3Mn1/3Co1/3]O2Positive Electrodes
Open Access
- 1 January 2012
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 159 (10), A1696-A1701
- https://doi.org/10.1149/2.056210jes
Abstract
The differential capacity and coulombic efficiency of blended Li/LiMn2O4-Li[Ni1/3Mn1/3Co1/3]O2 half cells were examined using high-precision constant-current chronopoteniometry. The experiments showed that the addition of even modest amounts of Li[Ni1/3Mn1/3Co1/3]O2 to the relatively low energy density LiMn2O4 electrodes produced a significant improvement in capacity retention. Li[Ni1/3Mn1/3Co1/3]O2 was also found to help suppress Mn dissolution from LiMn2O4, and a correlation between Mn dissolution, capacity retention and coulombic efficiency was found. The retained Mn ions reduce the increase of x in Li1+xMn2-xO4 at the particle surfaces. If x in Li1+xMn2-xO4 increases, a more Li rich, lower capacity material results, so by suppressing the increase of x, better capacity retention results.Keywords
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