Lead-acid storage battery plate additive preparation method

Abstract

The invention discloses a lead-acid storage battery plate additive preparation method. The method includes: preparing graphite oxide according to an improved Hummers' method; adding SDS (sodium dodecyl sulfate) serving as a surfactant with the mass fraction being 2-10wt%, adding a certain quantity of deionized water, mixing, and ultrasonically stripping to obtain graphene oxide water solution; transferring the graphene oxide water solution into a reactor, and performing hydrothermal reaction to obtain cylindrical reduced graphene oxide hydrogel; drying according to a freeze drying method to obtain reduced graphene oxide which is a final product. By additives prepared according to the method, specific surface area and porosity of lead-acid storage battery plates can be increased, charge acceptability of batteries is improved, and cycle lives of the batteries under HRPSoC conditions can be prolonged.

Description

technical field [0001] The invention relates to the technical field of lead-acid batteries, in particular to a method for preparing lead-acid battery plate additives. Background technique [0002] At present, lead-acid batteries have become the largest and most widely used battery varieties in the world because of their low price, easy availability of raw materials, reliable performance, easy recycling, and high-current discharge. Electric vehicles and other fields are inseparable from batteries. During the use of lead-acid batteries, as the number of charge and discharge increases, the discharge capacity will continue to decrease, which will eventually lead to battery failure. The reasons for the failure can be summarized as follows: ①Corrosion and deformation of the positive plate; ②The softening and falling off of the positive active material ; ③ irreversible sulfation; ④ premature loss of capacity; ⑤ thermal runaway. The most common cause of battery failure is usually ...

AI Technical Summary

Problems solved by technology

At the initial stage of discharge, the lead sulfate crystals generated are small. When charging, under the action of the electric field, the fine lead sulfate crystals are easily dissolved in the sulfuric acid electrolyte and reduced to lead as the active substance; as the number of charge and discharge increases, the fine lead sulfate crystals Lead sulfate crystals are easy to agglomerate into thick and hard crystals, and the coarse lead sulfate crystals are difficult to be reduced to lead during the charging process, resulting in intensified irreversible sulfation, reducing the utilization rate of active materials, and reducing the charge acceptance of the battery. eventually kills the battery

[0004] For the failure mechanism of the battery, after so many years of technological development, it is generally believed that adding additives to the active materials of the positive and negative plates of the battery is an effective solution to the problem. Additives are an important part of the lead-acid battery plate. The types of additives for the negative plate are more complicated. The common additives used for the negative plate of the lead-acid battery include barium sulfate, humic acid, lignosulfonate, etc. These additives are often added to the negative plate together. Battery performance has improved, but the deadliest problem of sulfation remains unresolved

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