ChemInform Abstract: Chemical Oxidation: A Route to Enhanced Capacity in Li-Ion Graphite Anodes.
Abstract
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ChemInform Abstract
The enhancement of the capacity of graphite anodes in Li+ ion cells by chemical oxidation is studied. Oxidation of graphite powder in a saturated solution of (NH4)2S2O8 in 1 M H2SO4 (NS) or in hot, concentrated HNO3 (NO) increases the reversible capacity obtained during cycling from 370 to 430 mAh/g, but reduces the irreversible capacity accompanying the first intercalation cycle. The FTIR spectra of NS- and NO-treated graphite samples and those subsequently treated with a LiOH solution give evidence for the formation of carboxylic acid derivatives and Li salts, resp., on the graphite surface. The Li salts stabilize the graphite surface and cause the increase of capacity.
