Quasi-random assembled single particle electrode and instinct electrochemical performance of LiFePO₄ in wide temperature scope

In this paper, we report a kind of quasi-random assembled single particle LiFePO₄ electrode (QRASPE). The result of the SEM indicated that all of the LiFePO₄ particles, separated completely by a sufficient amount of super-P conductor, form an assembled model of LiFePO₄ particle micro-electrodes. Our results indicate that the interaction among LiFePO ₄ particles, overlapping the outer diffusion field around each LiFePO₄ particle and shielding effect, affects accurate exhibition of instinct performance of LiFePO₄. Results of cyclic voltammograms of QRASPE can exhibit integrated redox performance of LiFePO₄ even at a high rate and wide temperature scope (233-313 K) owing to no interaction among LiFePO₄ particles. Larger D_Li+ values and lower apparent diffusion activation energy of Li⁺ in LiFePO₄/FePO ₄ solid phases are also revealed by QRASPE because of the merits of a single-particle microelectrode technique shown on QRASPE felicitously. Our investigation also explains the reason for the difference among the results of classical plate, single-particle electrode and theoretical simulation.