The Carbon-Lithium Negative Electrode for Lithium-Ion Batteries in Polymer Electrolyte

Several types of carbonaceous materials are evaluated as negative electrodes for lithium storage in polymer electrolyte based cells operated at 100oC. The corresponding faradaic efficiencies of the spherical cycle and the achieved reversible first capacity and rate capacity will be given. A meso carbon yielded a higher capacity than the theoretical 372 mAh/g. This is tentatively explained by the necessary enhancement of the carbon/polymer interfacial properties through the formation of C-Li-O bonding at the carbon surface and by the possible formation of multilayers of lithium on the external a, b planes of disordered carbons. The formation of the passivating layer on the carbon surface will be described. A lithium-ion type battery using coke and LiNiO2 as the negative and positive leads and POE-LiCIO4 was operated at 100oC and cycled galvanostatically. Good reversible capacity was attained with the LiNiO2 electrode.