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Kim, Youngsik
YK Research
Research Interests
  • Ionic conducting ceramic electrolyte membranes, energy conversion and storage materials and devices

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Enhanced electrochemical properties of LiNi1/3Co1/3Mn1/3O2 cathode material by coating with LiAlO2 nanoparticles

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Title
Enhanced electrochemical properties of LiNi1/3Co1/3Mn1/3O2 cathode material by coating with LiAlO2 nanoparticles
Author
Kim, Hyun-SooKim, YoungsikKim, Seong-IlMartin, Steve W.
Keywords
Cycle life; LiAlO2 nanoparticles; Lithuim-ion battery; Rate capability; Sol-gel method; Substituted lithuim cobalt oxide
Issue Date
2006-10
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.161, no.1, pp.623 - 627
Abstract
Surface coating of LiNi1/3Co1/3Mn1/3O2 with LiAlO2 nanoparticles has been attempted to improve the electrochemical properties of these materials as cathodes in lithuim-ion batteries. The coating is undertaken by a sol-gel method that uses C9H21O3Al, LiOH·H2O and LiNi1/3Co1/3Mn1/3O2. X-ray diffraction analysis shows that the LiAlO2 is composed of both α- and β-LiAlO2 phases. The average size of the particles is about 15 nm. The structure of LiNi1/3Co1/3Mn1/3O2 is not affected by the LiAlO2 nanoparticle coating. A 3 wt.% LiAlO2-coating increases the specific discharge capacity, provides excellent cycling performance (i.e. 96.7% capacity retention after 50 cycles at the 1 C rate) and improves the rate capability. By contrast, heavier coatings (5 wt.%) on LiNi1/3Co1/3Mn1/3O2 dramatically decrease both the discharge capacity and the rate capability, but enhance the cycle life.
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DOI
10.1016/j.jpowsour.2006.03.092
ISSN
0378-7753
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ECHE_Journal Papers
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