Electrochemical properties of Lithiated Carbons

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Abstract
The degree of reversible and irreversible insertion of lithium in the fibrous carbonaceous materials was estimated by charge-discharge characteristics. The electrochemical storage of lithium ions, i.e. specific capacity, widely ranged from 100 to 700 mAh/g depending on the textural properties and chemical composition of carbons. The elucidation of irreversible loss of capacity was undertaken for carbons obtained from different precursors and prepared in a wide range of temperatures. Especially, the role of heteroatoms in the process of lithium insertion was considered for carbons prepared at temperatures from 600°C to 1000°C. The value of electrochemical potentials for lithiated carbons, more or less close to the potential of metallic lithium, is influenced by the stoichiometry of the compound and the way of Li-C bonding. Some carbons pointed out a large hysteresis, i.e. a high divergence between average discharge and charge potential. The reversibility of lithium insertion was also investigated by the potentiodynamic technique.

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