DIFFERENTIAL SCANNING CALORIMETRY STUDY OF THE REACTIVITY OF CARBON ANODES IN PLASTIC LI-ION BATTERIES

Chemical reactions taking place at elevated temperatures in a polymer- bonded lithiated carbon anode were studied by differential scanning ca lorimetry. The influences of parameters such as degree of intercalatio n, number of cycles, specific surface area, and chemical nature of the binder were elucidated. It was clearly established that the first rea ction taking place at ca. 120-140 degrees C was the transformation of the passivation layer products into lithium carbonate, and that lithia ted carbon reacted with the molten binder via dehydrofluorination only at T > 300 degrees C. Both reactions strongly depend on the specific surface area of the electrodes and the degree of lithiation.