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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 2
BKCSDE 31(2)
February 20, 2010 
 
Title
 Enhanced Electrochemical Property of Surface Modified
Li[Co1/3Ni1/3Mn1/3]O2 by ZrFx Coating
Author
 Su Hyun Yun, Yong Joon Park*
Keywords
 Cathode, ZrFx, Surface coating, Lithium battery
Abstract
 A Li[Ni1/3Co1/3Mn1/3]O2 cathode was modified by applying a ZrFx coating. The surface-modified cathodes were characterized by XRD, SEM, EDS, TEM techniques. XRD patterns of ZrFx-coated Li[Ni1/3Co1/3Mn1/3]O2 revealed that the coating did not affect the crystal structure of the parent powder. SEM and TEM images showed that ZrFx nano-particles were formed as a coating layer, and EDS data confirmed that ZrFx distributed uniformly on the surface the powder. Capacity retention of coated samples at high C rates was superior to that of pristine sample. However, as the coating concentration increases beyond the optimum concentration, the rate capability was deteriorated. Whereas, as the increase of coating concentration to 2.0 wt %, the cyclic performances of the electrodes under the severe conditions (high cut-off voltage, 4.8 V, and high measurement temperature, 55 oC) were improved considerably.
Page
 355 - 359
Full Text
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