Effect of acetic acid on NMC811 electrode made by freeze casting

Abstract

To obtain higher capacity and meet the requirements of rapid charging and discharging, reasonable design of electrode structure is required. At the same time, although water-based binders are attempted to use in anode preparation, the pH rise and aluminium foil corrosion caused by the reaction of high nickel cathode materials and water cannot be avoided. In this paper, we used directional freeze casting technology to make porous electrodes, and we added acetic acid and used carbon-coated aluminium foil to try to improve it. After the performance of the electrode decreased in the first few cycles, the electrode obtained long-term excellent performance. The addition of acetic acid significantly improved the performance of NMC811 electrode, and the electrode capacity was further improved after adjusting the positive electrode structure in the freezing casting process. The discharge specific capacitance of the electrode is 189 mAh g−1 at 0.1 C and 94 mAh g−1 at 10 C. It is superior to the electrode manufactured by traditional PVDF-based binder.