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Mass‐transport Control on the Discharge Mechanism in Li–O 2 Batteries Using Carbon Cathodes with Varied Porosity
Author(s) -
Aklalouch Mohamed,
OlivaresMarín Mara,
Lee RungChuan,
Palomino Pablo,
Enciso Eduardo,
Tonti Dino
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500719
Subject(s) - electrolyte , porosity , cathode , carbon fibers , electrode , current density , materials science , chemical engineering , mass transport , analytical chemistry (journal) , chemistry , composite material , chromatography , engineering physics , physics , quantum mechanics , composite number , engineering
By comparing carbon electrodes with varying porosity in Li–O 2 cells, we show that the effect of electrolyte stirring at a given current density can result in a change from 2D to 3D growth of discharged deposits. The change of morphology is evident using electron microscopy and by analyzing electrode pore size distribution with respect to discharge capacity. As a consequence, carbon electrodes with different textural properties exhibit different capacity enhancements in stirred‐electrolyte cells. We demonstrate that mass transport can directly control the discharge mechanism, similar to the electrolyte composition and current density, which have already been recognized as determining factors.