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The dispersion property of aqueous lithium cobalt oxide slurries and their corresponding cell performance with and without addition of dispersant, ammonium polyacrylic acid , were investigated. The surface chemical properties of and graphite powders were characterized by diffuse reflectance using infrared Fourier transform spectrometry. The adsorption effects of and latex binder (LA132), respectively, on the dispersion behaviors of and graphite powders in aqueous suspensions were analyzed by measurements of adsorption behavior, ζ potential, sedimentation property, and rheology. The results showed that the can adsorb onto both the and graphite powders to stabilize them in aqueous suspensions, but LA132 binder only adsorbs onto graphite and showed a competitive adsorption with on the graphite surface. By observation of scanning electron microscope, it was shown that the as-prepared sheet without addition had significant agglomeration of powders and accumulation of binder around the powder. These undesired coagulations of powder and binder can be diminished by increasing the content. Although the dispersion property of powders was increased with increasing content, too much addition of is detrimental to the electronic conduction, adhesion strength, and electrochemical properties of electrode. To simultaneously obtain a well-dispersed and a better electrochemical property of electrode sheet, the appropriate amount of was found to be on the order of based upon .
Li et al. (Sun,) studied this question.