Abstract
Effects of microtexture were analyzed using mesocarbon microbeads (MCMB) and two reference cokes heat-treated at 1000°C, a mesoporous saccharose coke and a lamellar anthracene coke. The electrochemical performance of MCMB heat-treated at 900°C (340mAh/g for the reversible capacity) are attributed to the specific microtexture of the beads, which are both lamellar (inner part) and mesoporous (outer part). The disorganised phase present at the surface of MCMB favors lithium sorption and further intercalation in the bulk. The electrochemical characteristics of saccharose coke were drastically changed by a mild oxidation at 450°C. The presence of oxygen at the surface plays an important role by enhancing lithium adsorption on surface sites prior to diffusion into the grains.
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