FIELD: electrical engineering.
SUBSTANCE: hydrolised lignin is milled till particle size is 0.1-1.0 mm, treated with 5% hydrochloric acid at weight ratio 1:(4.5-5.5) during at least 1.0 h and centrifuged with the sediment washed. The obtained sediment is treated with 5% hydrofluoric acid at weight ratio 1:(4.5-5.5) during at least 1.0 h and centrifuged with the sediment washed and dried.
EFFECT: cathode material energy capacity and electric conductivity improvement combined with simultaneous simplification of the method and its hardware as well as produced material prime cost reduction.
1 dwg, 4 ex
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