CARBON-FIBERS AND NATURAL GRAPHITE AS NEGATIVE ELECTRODES FOR LITHIUMION-TYPE BATTERIES

Carbon fibres (CFs), from different origins, and natural graphite are used as host lattices for lithium electrochemical intercalation and de -intercalation in organic liquid and solid polymer electrolytes, respe ctively. In both systems, irreversible behaviour occurred during the f irst cycle of which the origin is tentatively discussed. The reversibl e capacity of the mesophase CFs-based electrodes, which is related to the total relative amount of lithium exchanged with the electrolyte du ring the charge/discharge operations, is found to increase with their crystallinity. Some thermodynamic data associated with the formation o f the stage-1 graphite-lithium compound in polymer electrolyte-based c ells are determined.