We prepared slurries by dispersing LiMn_2O_4 and LiCoO_2 into toluene or NaPO_3 aqueous solution. The slurries were then milled with a high-pressure wet-type jet mill to form fine particles. In estimating the performance of Li cells containing the materials, we found that the cell capacity improved with a decrease in the materials' particle size. Maximum cell capacity was obtained using materials produced by milling NaPO_3 slurry to reduce the particle diameter to 2-3μm. We also found that the cell cycle life tended to increase with a decrease in the mean diameter of the material particles.
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