FIELD: electricity.
SUBSTANCE: paste for negative electrode contains plumbum dust, H2SO4, expander that includes BaSO4, sodium lignosulphonate and water, additionally it contains soft carbon with the following proportion of components, wt %: H2SO4 8-10 BaSO4 0.3-0.5 sodium lignosulphonate 0.1-0.2 soft carbon 0.2-0.3 water 7-8 plumbum dust the rest, note that BaSO4 grain size does not exceed 10 nm; additionally the paste can contain polyvinyl-chloride fibre in quantity of 0.03-0.06 wt %. Method of preparation of paste for negative electrode by mixing plumbum dust, H2SO4 and expander consists in, first, mixing of plumbum dust and expander for 8-15 minutes, then adding of water, the mixture is stirred for 8-15 minutes, after that H2SO4 is added during stirring with speed 0.7-0.8 l/min, note that the mixture temperature is maintained within 30-70°C.
EFFECT: increase of battery service life and prevention of battery capacity loss.
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