Studies On Improving The Electrode Performance By Membrane Modification Method And OER Catalyst

Abstract:Plasma activated technology and sulphonated method were used to graft the Commercial lithium battery membrane surface with sulfonic acid foundation group and MMA group. The electrochemical properties of assembled Li-ion battery with modified membrane have been carefully investigated by charge/discharge test together with cyclic voltammetry (CV).Note that, membrane surface with sulfonic acid foundation group or MMA group can effectively suppress the crystal branches formation as well as facilitate a better structure stabilized SEI layer on Lithium metal electrode surface, sequentially improved the cyclic performance and safe properties of anode materials for lithium battery.The charge/discharge test was carried on half cells with carbon-based anode and LiFePO4cathode respectively, using our modified membrane. The results showed that the initial reversible discharge capacities and cycle performance were significantly improved under low current density. To the contrast,The grafted functional surface groups can not improve the high-current electrochemical performance of carbon-based anode. But the LiFePO4electrode properties was improved very obviously under high current density.In this dissertation, A series of mixed type OER electro-catalysts are prepared by coprecipitation method. Linear sweep voltammetry (LSV)、cyclic voltammetry(CV)、 polarization、electrochemical impedance spectroscopy(EIS) and AC voltammetry are used to research the electro-catalytic activities on oxygen evolution reaction of the electrode made by the electro-catalysts. XRD and SEM analysis is also used. By analysis the test result, The component recipe of Ni/Co、Co/Pb、Ni/La、Co/Ni/La oxygen electrodes is optimized.