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The particle size of Li[Ni 0.2 Li 0.2 Mn 0 ]O 2 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 0.2 Li 0.2 Mn 0.6 ]O 2 powder was not detected. The rate performance of the Li[Ni 0.2 Li 0.2 Mn 0.6 ]O 2 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.

Dispersion of Li[Ni0.2Li0.2Mn0.6]O2Powder by Surfactant for High-power Li-ion Cell

Dispersion of Li[Ni_0.2Li_0.2Mn_0.6]O₂Powder by Surfactant for High-power Li-ion Cell