Graphite is an important non-metallic mineral resource. Due to its excellent properties and abundant reserves in nature, graphite is widely used in electrochemistry, often as electrode material. However, in electrolytes, even corrosion-resistant graphite can be corroded, severely affecting the service life of the electrode; it also makes battery discharge highly unstable.
Graphite is an important non-metallic mineral resource. Due to its excellent properties and abundant reserves in nature, graphite is widely used in electrochemistry, often as electrode material. However, in electrolytes, even corrosion-resistant graphite can be corroded, severely affecting the service life of the electrode; it also makes battery discharge highly unstable.
The raw material for processing graphite products determines the oxidation degree of the product when preparing graphite oxide from natural flake graphite. The product with a high degree of oxidation shows a significant characteristic peak near 10° in its XRD pattern at 2θ. Experimental results of the preparation process of graphite oxide show that the amounts of reactants, the amount of potassium permanganate, and the low-temperature reaction time are important factors influencing the oxidation degree of the processed graphite products. From the polarization curves, the corrosion resistance of graphite oxide is better than that of expandable graphite, and the corrosion resistance of expandable graphite is better than that of natural graphite. The higher the purity of natural graphite, the better its corrosion resistance; for different graphite particle sizes, the larger the particle size of natural graphite used to prepare graphite oxide, the better the corrosion resistance.