Lead-acid storage battery cathode diachylon made of high-activity carbon material and preparation method of lead-acid storage battery cathode diachylon

Abstract

The invention discloses lead-acid storage battery cathode diachylon made of a high-activity carbon material and a preparation method of the lead-acid storage battery cathode diachylon. The preparationmethod comprises the following steps: (1) dispersing 0.2-0.8g of short carbon fibers into deionized water; (2) grinding 500g of lead oxide and 1.5-4.0g of the high-activity carbon material for 4-6min, sequentially adding 3.5-5g of barium sulfate, 0.5-1g of lignin, 3.5-5.5g of TiO2, 0.5-1.5g of humic acid and the dispersed short carbon fibers into the mixture of the lead oxide and the high-activity carbon material, and stirring the mixture for 10-12min; (3) adding 40-43g of sulfuric acid with the density of 1.4g/cm<3> drop by drop, and regulating the consistency of the diachylon with 50-65g ofdeionized water, so that the apparent density of the diachylon is 4.3-44g/cm<3>. According to the cathode diachylon, the porosity and the acid absorption value of a cathode plate can be increased, sothat sulfate ions can be diffused favorably, and the active surface area of an electrode is increased. Therefore, the chemical reaction of the electrode is performed more smoothly, and the cycle lifeof a lead-acid storage battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a highly active carbon material lead-acid storage battery negative lead paste and a preparation method thereof. technical background [0002] Lead-acid batteries are mainly used in the starting of electric mopeds, electric road vehicles, hybrid vehicles and various internal combustion engines and wireless communication base stations, etc. Reduced charging capacity and cycle life of the battery. [0003] It has been reported that the introduction of carbon materials into the negative plate of lead-acid batteries can improve the discharge capacity, charge acceptance and cycle life of the negative plate of the battery. In the process of simulating the high-rate charge and discharge of lead-acid batteries, adding activated carbon to the negative active material can significantly improve the charge acceptance of the battery and effectively prevent the sulfation o...

AI Technical Summary

Problems solved by technology

[0005] However, the introduction of carbon materials has also brought some new problems, such as the intensification of the hydrogen evolution reaction at the later stage of charging caused by the inconsistency of the hydrogen evolution potentials of lead and carbon, the reduction of the lead-carbon binding force when the mass fraction of carbon in the lead paste is high, and Some high specific surface area activated carbons have poor conductivity and other problems

At the same time, the carbon material itself also has some disadvantages: high-purity graphite, acetylene black, etc. have good conductivity but small specific surface area, and low capacitance contribution; activated carbon, carbon nanotubes, etc. have large specific surface area, high capacitance contribution, but conductive Poor performance, too high addition will affect the charge and discharge performance

Expanded graphite and graphene have both conductivity and specific surface area, but the particle size of expanded graphite is too large, it is not easy to disperse and agglomerate when mixed with lead paste, and the process difficulty increases; the cost of graphene is high, which will increase the lead carbon to a certain extent. The cost of the battery, while the key problem of low hydrogen evolution overpotential has not been fundamentally resolved