摘要
The dispersion property of aqueous lithium cobalt oxide (LiCoO 2 ) slurries and the corresponding cell performance of LiCoO 2 electrodes with and without dispersant additions were investigated. The influence of dispersant, ammonium polyacrylic acid (PAA-NH 4 ), and polyacrylic latex binder (LA132) on the dispersion behaviors of LiCoO 2 in aqueous suspensions is characterized by zeta potential and rheology measurements. The results show that the PAA-NH 4 can adsorb onto the LiCoO 2 powder to provide an electrosteric stabilization in aqueous suspensions, but LA132 does not show such function. For the as-prepared LiCoO 2 electrode without PAA-NH 4 addition, the LiCoO 2 powder agglomerates and the binder accumulates around the powder. This unfavorable phenomenon can be diminished by increasing PAA-NH 4 content. However, it is found that too much addition of PAA-NH 4 is detrimental to the electrochemical properties of LiCoO 2 . To simultaneously obtain a well-dispersed LiCoO 2 and a LiCoO 2 electrode with a better electrochemical property, the appropriate amount of PAA-NH 4 is about 0.01 wt % based upon LiCoO 2 weight. © 2005 The Electrochemical Society. All rights reserved.