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Graphite is a widely used anode electrode material for Li-ion batteries. When the anode is polarized to a low potential, the electrolyte reduction products form a film called SEI (Solid Electrolyte Interphase) playing a crucial role in the reversibility of the electrochemical cycling. This SEI layer is preferentially formed through the carbon edge planes that can be divided into two main categories...
The electrochemical insertion of lithium ions into graphite materials having different surface chemistry and defect concentration was studied during the first cycle in half-cell containing 1M LiPF 6 in an electrolytic solvent mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC). The graphite surface properties were varied by thermal treatments in either hydrogen, oxygen, or nitrogen...
We report the influence of two surface parameters, the active surface area (ASA) and the surface chemistry (oxygen functional groups) on the first electrochemical reduction of graphite. The experimental results highlight two important points. One, the ASA is the determining parameter which controls the exfoliation during the first electrochemical cycle. An ASA limit (ca. 0.2m 2 g −1 ...