The mechanism of lithium intercalation in graphite film electrodes in aprotic media. Part 1. High resolution slow scan rate cyclic voltammetric studies and modeling

摘要: Using slow scan rate (4 to 80 μVs−1) cyclic voltammetry for thin graphite electrodes (8 10 μm thick), two limiting cases the intercalation mechanism of Li ion in aprotic solvents have been observed: (i) quasi-equilibrium, capacitive-like step at very potential rates and (ii) semi-infinite diffusion Li+ ions inside matrix higher rates. Each these types behavior has appropriately modeled, from comparison experimental simulated voltammetric curves quantitative information extracted, including (a) effective heterogeneous constants transfer through graphite|solution interface; (b) lateral attraction parameter intercalated species; (c) half-peak width peak separation; (d) coefficients ions. The features CV are qualitative agreement with island model staging process proposed literature. The evaluated data were found be close those obtained a potentiostatic intermittent titration technique applied same electrodes.