The electrochemical test was carried out 2032-type coin cells assembled in a glove box (Mikrouna) filled with argon (H2O < 0.01 ppm, O2 < 0.01 ppm). The working electrodes were prepared through dispersing 80 wt.% active cathode materials, 10 wt.% super P (Sigma Aldrich) as the conductive carbon, and 10 wt.% PVDF into NMP solvent. After coating the slurry on the Al foil, a heating stage was used to evaporate NMP. In the coin cells, the metallic lithium foil was employed as the reference and counter electrodes, and a polyethylene membrane (Shanghai Enjie, thickness 16 μm) was utilized as the separator. The electrolyte also contained 1 M LiPF6 solution dissolved in ethylene carbonate (EC) and dimethyl carbonate (DMC) at a volumetric ratio of 1:1. The actual loading of the active materials was approximately 3.5 mg in the cathode with a diameter of 12 mm and a thickness of 50 μm for all electrode materials. The electrochemical impedance spectroscopy (EIS) was swept from 100 kHz to 1 Hz on an electrochemical workstation (Gamry, Interface 1010E). The galvanostatic charge-discharge tests were also conducted using a battery testing system (Wuhan LAND) at room temperature from 3.0 V to 4.5 V.