| abstract |
The invention provides an improved method for preparing homogeneous intermixtures of particulate manganese dioxide and conductive carbon for use in cathodes for electrocheminal cells, in particular alkaline primary cells. Homogeneous intermixtures can be prepared by mechanically activating an essentially dry admixture of particulate electrolytic manganese dioxide and a natural graphite, an expanded graphite or combinations thereof with inert, rigid milling media by the agitation process of the invention. Improved cell discharge performance at both low and high rates of discharge can be achieved for extremely low levels of highly expanded graphite, typically between about 1 and 5 wt %. |