Special material for battery – graphite powder

Graphite powder is used in the production process of batteries, mainly refers to high-purity graphite powder. Because lithium-ion batteries have high requirements for electrical conductivity, graphite powder is a kind of carbon material owing to it is refractory and conductive. It is widely used in any field. Including refractory bricks, crucibles, continuous casting powder, casting cores, casting detergents and high temperature resistant materials, etc. Even graphite powder and other impurity materials can be used as recarburizers when used in the steelmaking industry.

The role of graphite powder in batteries

Graphite has an excellent role in batteries. It is mainly used for the positive electrode material of lithium ion battery and the positive electrode material of lead-acid battery, which have been widely used in small and medium-sized household appliances. Graphite powder increases the current and voltage of the battery and prolongs the discharge time. In particular, the amount of graphite powder is small, which can be reduced by 32.5% compared with similar domestic products, which increases the amount of manganese powder and effectively prolongs the discharge time of the battery. In particular, the expanded graphite powder for mercury-free alkaline batteries in the state of 50-80 mesh, after expansion, crushing and classification treatment, can reduce the content of conductive substances in the positive electrode of the battery, increase the content of active substances, reduce the ohmic internal resistance of the battery, and improve the battery. capacity.

The principle of graphite powder conduction

Graphite powder has excellent lubrication and electrical conductivity. The higher the purity of graphite powder, the better the electrical conductivity. It can be added to the rubber to conduct electricity. The graphite powder content for wear-resistant rubber products should not exceed 30%, and the graphite powder content for conductive rubber should reach 100%. The basic principle of conduction is that the conductor cannot be interrupted. If it is interrupted, it will not be energized. The conductive graphite powder in the conductive rubber is the conductor. If it is cut off by the rubber, it will not be conductive, so the proportion of graphite powder is less conductive. The effect is probably not good.

Other applications of graphite powder

Graphite powder is suitable for many fields. It is widely used in the electrical industry as electrodes, brushes, carbon rods, carbon tubes, positive electrodes of mercury rectifiers, graphite washers, telephone parts, coatings for TV picture tubes and other conductive materials.

(1) As a wear-resistant and lubricating material, graphite powder is often used as a lubricant in the machinery industry. Lubricating oil often cannot be used under the conditions of high speed, high temperature and high pressure, while graphite powder wear-resistant material can work without lubricating oil at -200-2000 temperature and high sliding speed. The specially processed graphite powder has good chemical stability, corrosion resistance, good thermal conductivity, low permeability, etc., and is widely used in the production of heat exchangers, reaction tanks, condensers, combustion towers, absorption Towers, coolers, heaters, filters, pumps and other equipment.

(2) Due to the small expansion coefficient of graphite powder and the change of resistance to rapid cooling and rapid heating, it can be used as a casting mold for glassware. After using graphite powder, the casting obtained from ferrous metal has accurate size, smooth surface and high yield without processing. Or a little processing can be used, thus saving a lot of metal. Graphite powder can prevent boiler scaling. Tests of relevant units show that adding a certain amount of graphite powder to the water (about 4-5g per ton of water) can prevent scaling on the boiler surface. In addition, graphite coating on metal chimneys, roofs, bridges and pipes can prevent corrosion and rust.

The graphite powder from the Franli factory has good electrical conductivity, which is mainly achieved through the production process of increasing the carbon content of the graphite powder. Although the main composition of graphite powder is carbon element, there are also impurities such as trace metal elements. It is necessary to remove impurities such as metals through the production process and increase the carbon content of graphite powder, so as to achieve the carbon content of conductive graphite powder.