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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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Stabilization of spinel-like phase transformation of o-LiMnO2 during 55 degrees C cycling by sol-gel coating of CoO

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Title
Stabilization of spinel-like phase transformation of o-LiMnO2 during 55 degrees C cycling by sol-gel coating of CoO
Author
Cho, Jaephil
Keywords
ORTHORHOMBIC LIMNO2; LITHIUM BATTERIES; CAPACITY; LIMN2O4; CATHODE; ELECTRODES; CELLS
Issue Date
2001-12
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v.13, no.12, pp.4537 - 4541
Abstract
Low-temperature sol-gel coating of CoO on orthorhombic LiMnO2 (o-LiMnO2) particles greatly stabilizes spinel-like phase transformation during electrochemical cycling at 55 degreesC. Enhanced structural stability of the coated o-LiMnO2 is because discretely higher Co concentration at the surface than in the bulk improves the structural stability of cycling-induced LiMn2O4 and Li2Mn2O4 phases. The coated o-LiMnO2 shows increased discharge capacity to 185 from 170 mAh/g at 0.2 C rate (=36 mA/g) cycled between 4.5 and 2 V. In addition, the coated o-LiMnO2 exhibits smaller capacity fading than the bare one (35%), showing only 12% capacity loss of the discharge capacity after 50 cycles.
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DOI
10.1021/cm0101935
ISSN
0897-4756
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ECHE_Journal Papers
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