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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 7
BKCSDE 30(7)
July 20, 2009

Title	Dispersion of Li[Ni_0.2Li_0.2Mn_0.6]O₂ Powder by Surfactant for High-power Li-ion Cell
Author	Su Hyun Yun, Yong Joon Park*
Keywords	Cathode, Battery, Surfactant, Dispersion, Rate performance
Abstract	The particle size of Li[Ni_0.2Li_0.2Mn_0.6]O₂ cathode powder was controlled effectively by dispersion using lauric acid as a surfactant. The samples treated by lauric acid showed smaller particles of approximately half the original size compared to the particles of a pristine sample. A structural change due to the dispersion of Li[Ni_0.2Li_0.2Mn_0.6]O₂ powder was not detected. The rate performance of the Li[Ni_0.2Li_0.2Mn_0.6]O₂ cathode was improved by dispersion using lauric acid, which was likely due to the decrease of the particle size. In particular, a sample dispersed pristine powder using lauric acid (L2) presented a greatly enhanced discharge capacity and capacity retention at a high C rate. The discharge capacity of a pristine sample was only 133 mAhg^-1 (3C rate) and 96 mAhg^-1 (12C rate) at the tenth cycle. In contrast, the L2 electrode delivered higher discharge capacities of 160 mAhg^-1 (3C rate) and 129 mAhg^-1 (12C rate) at the tenth cycle. The capacity retention at a rate of 12C/2C was also enhanced from ~ 45% (pristine sample) to 57% (L2) by treatment with lauric acid.
Page	1598 - 1602
Full Text	PDF

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