Breathable carbon rods and preparing method thereof

Abstract

The invention discloses breathable carbon rods and a preparing method thereof. The breathable carbon rods are mainly prepared from, by mass, 32%-33% of amorphous graphite powder, 4.5%-5% of crystalline flake graphite, 15%-16% of petroleum coke, 15%-16% of coke powder and 30%-32% of coal tar pitch. The preparing method comprises the steps of uniformly mixing the amorphous graphite powder, crystalline flake graphite, petroleum coke, the coke powder and the coal tar pitch to obtain mixed paste; pressing the mixed paste into blank carbon strips; roasting the blank carbon strips in sequence, and grinding the blank carbon strips into semi-finished product carbon rods; putting the semi-finished product carbon rods into paraffin to be soaked; centrifuging the semi-finished carbon rods soaked with paraffin, and conducting vacuum pumping treatment to obtain the breathable carbon rods. The porosity of the breathable carbon rods is 22% or above, the permeation volume maximally reaches 25 mL / min or above, the carbon content reaches up to 92%-95%, the seepage-proof performance is 98% or above, if the breathable carbon rods are manufactured into batteries, the discharging performance is high, and the battery discharging time is 90 h or above.

Description

Technical field [0001] The invention relates to the field of battery carbon rod materials, in particular to a gas-permeable carbon rod and a preparation method thereof. Background technique [0002] Due to the chemical and physical changes inside the battery, a large amount of gas needs to be discharged. Therefore, the gas permeability of the carbon rod is required to be good, otherwise it will cause the battery to swell and cause the battery to be scrapped, especially in Africa and other countries where the ambient temperature is high. The ventilation requirements are particularly high. However, the carbon rods must be treated with anti-seepage treatment to prevent the carbon rods from leaking. The current production process uses petroleum jelly and gasoline to soak the carbon rods. Although this process can improve the anti-seepage performance of the carbon rods, it will seriously affect the carbon rods. Breathability. The air permeability of the carbon rod prepared by this m...

AI Technical Summary

Problems solved by technology

Therefore, the carbon rods prepared by the current method have low air permeability, low carbon content, poor discharge performance, and complicated operation. Soaking the carbon rods with gasoline will also pose a safety hazard to production.

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