Lead-acid storage battery negative electrode lead paste and preparation method thereof

Abstract

The invention discloses lead-acid storage battery negative electrode lead paste. The negative electrode lead paste is composed of a main material and an auxiliary material, wherein the main material comprises the following components in parts by weight: 40-50 parts of tribasic lead sulfate (3BS) and 50-60 parts of lead powder; and the auxiliary material comprises the following components in partsby weight: 15-20 parts of deionized water, 0.1-1 part of acetylene black, 0.1-0.5 parts of sodium sulfate, 0.1-0.25 parts of conductive fibers, 0.1-0.5 parts of lignin, 0.1-0.5 parts of humic acid and0.5-2 parts of barium sulfate. The negative electrode lead paste is prepared by mixing the above-mentioned components uniformly. By virtue of the negative electrode lead paste, the electrochemical performance of the lead-acid storage battery is improved and the service life of the battery is prolonged; and in addition, the preparation method is simple, the process conditions are controllable, andthe production cost can be lowered.

Description

technical field [0001] The invention belongs to the technical field of lead-acid batteries, and in particular relates to a lead-acid battery negative electrode paste and a preparation method thereof. Background technique [0002] Lead-acid battery (Lead-acid battery) was invented by the Frenchman Plante in 1859. It is mainly composed of positive plate, negative plate, electrolyte, separator, electrolytic tank, battery cover, pole and so on. The main active ingredient of the positive electrode is lead dioxide, the main active ingredient of the negative electrode is lead, and the electrolyte is sulfuric acid solution. The chemical reactions involved in its discharge are as follows: [0003] Discharge positive electrode: PbO 2 +4H + +SO 4 2- +2e-=PbSO 4 +2H 2 O; [0004] Discharge negative electrode: Pb+SO 4 2- -2e-=PbSO 4 ; [0005] Lead-acid batteries have the advantages of good charge and discharge performance, safety and stability, and low price. Currently, they...

AI Technical Summary

Problems solved by technology

[0006] Although lead-acid batteries are widely used, in northern China, the power performance, charge acceptance capacity, and cycle life of lead-acid batteries are generally worse than those in southern regions. The above reasons are mainly due to the current negative electrode formula of lead-acid batteries. Mainly composed of lead powder, sulfuric acid, pure water, conductive agent, expansion agent and fiber and other materials

The above types of negative electrode formulations can easily cause problems such as poor plate consistency, low-temperature high-current discharge, charge acceptance, and poor cycle life.

In conventional lead paste negative electrode formulations, sulfuric acid is added during the paste mixing process to generate active substances such as 4BS, 3BS, 2BS, 1BS, etc. The chemical reactions in the paste mixing and curing process are complex, and slight changes in the environment and process will result in different active substance components.

Therefore, the polar plates made of conventional formulas have different positions on the same polar plate, and the component content deviation between the polar plates is large and the uniformity is poor. After the battery is used, it is easy to cause poor consistency of the battery cells and affect the electrochemical performance of the battery. At the same time, the electrode paste and lead paste prepared by the traditional formula, the bonding force between the lead paste and the grid is weak, and the battery can easily cause the negative electrode active material to fall off and muddy during the recycling process, reducing the service life of the battery.

Images