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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 11
BKCSDE 31(11)
November 20, 2010 

The Effect of Coating Thickness on the Electrochemical Properties of a Li-La-Ti-O-coated Li[Ni0.3Co0.4Mn0.3]O2 Cathode
Hye Jin Lee, Yong Joon Park*
Cathode, Li-La-Ti-O, Surface coating, Lithium battery
A Li[Ni0.3Co0.4Mn0.3]O2 cathode was modified by coating with Li-La-Ti-O, and the effect of the coating thickness on their electrochemical properties was studied. The thickness of the coating on the surface of Li[Ni0.3Co0.4Mn0.3]O2 was increased by increasing the wt % of the coating material. The rate capability of the Li-La-Ti-O-coated electrode was superior to that of the pristine sample. 1- and 2-wt %-coated samples showed considerable improvement in capacity retention at high C rates. However, the rate capability of a 5-wt %-coated sample decreased. All the coated samples showed a high discharge capacity and slightly improved cyclic performance under a high cut-off voltage (4.8 V) condition. Results of a storage test confirmed that the Li-La-Ti-O coating layer was effective in suppressing the dissolution of the transition metals as it offered protection from the attack of the acidic electrolyte. In particular, the 2- and 5-wt %-coated samples showed a better protection effect than the 1-wt %-coated sample.
3233 - 3237
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