Battery special graphiteAnti-oxidation treatment method

The anti-oxidation treatment process of battery-specific graphite includes material preparation, weighing, impregnation solution preparation, impregnation electrode treatment and drying treatment. After graphite electrode treatment, it can be processed into graphite electrode products of various specifications. The treated graphite electrode was the same as the untreated graphite electrode. Compared with graphite electrode, it has the characteristics of smooth surface and good conductivity. The mechanical design strength can be increased by 50-60%, the porosity is gradually reduced by 10-15%, and the electrode material consumption can be reduced by 20-25%. Electrode consumption can be reduced by 20-25%.

The anti-oxidation treatment of battery-specific graphite has the following properties:

(1) Weighing of prepared materials: Weigh the graphite electrode and provide qualified materials to be processed;

(2) Preparation and heating of impregnating solution: The composition of impregnating solution mainly includes 18-27% of boric acid (h↓[3]bo↓[3]) produced by China's industry, 7-15% of borax (na↓[2]b↓[4 ]o↓[7]) used by industry, mixed with water to make various liquids, and heated after mixing;

(3) Impregnation electrode treatment in which the prepared graphite electrode is placed in a vacuum tank to be sealed, vacuumed by a vacuum pump, and the heated impregnation solution is poured into the vacuum tank for electrode impregnation. In the process of electrode soaking, the concentration of electrode soaking solution shall be reduced as appropriate;

(4) Secondary weighing: After the electrode material is treated by impregnation technology, a vacuum tank is opened, the impregnated graphite is taken out as an electrode, and the leaching solution is drained. Immersion electrode weight gain of more than 10%;

(5) Drying treatment: drying the immersed graphite electrode so that the water content of the electrode is not higher than 0.5;

(6) Weighing 3 times: After drying, graphite is used as an electrode in the weighing process again, so that the relative increase in weight is more than 3% of the weight before impregnation;

(7) Finished product processing: The graphite electrode after the above treatment can be processed into a standard shape as required. The graphite electrode after the above data processing can be processed into a standard shape according to the needs of the enterprise.

Graphite is mainly composed of three parts: fixed carbon, ash and volatiles. The fixed carbon is the electrochemically active component. The standard has strict requirements for fixed carbon content, at least greater than 99.5 percent. In addition, in addition to fixing the main elements such as carbon and lithium, some impurity elements are also introduced in the coating and doping process, which seriously affects the electrochemical performance of the battery and needs to be strictly controlled. In addition, some of the negative raw materials contain restricted elements such as cadmium, lead, mercury, hexavalent chromium and their important compounds, which are harmful to animals, plants and the environment. Therefore, there are strict requirements and restrictions on such research materials in corporate standards.

Battery-specific graphite is one of the main anode materials for lithium batteries. Ultrafine grinding of graphite is a key step to affect the particle size distribution, specific surface area and crystal structure of anode materials. Therefore, ultrafine grinding equipment is very important. Superfine vertical mill is an ideal choice for the processing of new nano ultrafine powder. The powder quality is safe and stable, the energy consumption is low, the output is high, the environmental protection education effect is good, and the operating system is intelligent, which provides a solid backing for the processing of lithium batteries. Anode material.