Method for preparing carbon material from mechanical waste oil, carbon material and application

The invention discloses a method for preparing a carbon material from mechanical waste oil, the carbon material and application, and belongs to the field of new energy materials, the method comprises the following steps: S1, precipitating the mechanical waste oil to remove large-particle impurities in the mechanical waste oil; further treating the waste oil by using an adsorbent to remove small-particle impurities and volatile pollutants; after filtering treatment, pre-treated waste oil is obtained; s2, adding the pretreated waste oil obtained in the step S1 into an opposed piston two-stroke internal combustion engine, regulating and controlling the content of oxygen, and converting the waste oil into a carbon precursor in an instant high-temperature and high-pressure environment; s3, carbonizing and calcining the precursor obtained in the step S2 to generate a calcined product; s4, the calcined product is subjected to acid pickling, impurities are removed through washing, drying is conducted, and a carbon ma