Method for preparing positive plate of lead storage battery

Abstract

The invention discloses a method for preparing a positive plate of a lead storage battery, and belongs to the technical field of preparation of electrode materials, in particular to a process for a preparation method for the lead storage battery. In the method, a lead alloy is used as a raw material, a lead-alloy positive electrode grid formed by fusion and casting is used as the positive electrode and is subjected to surface modification in rare earth sulfate and sulphuric acid solution by an anodic electrochemical oxidation process to prepare a positive plate of the lead storage battery that the surface of the lead alloy is modified by the rare earth; and lead powder, water, sulfuric acid and rare earth oxides or rare earth sulfate and additives are mixed into a lead plaster, and the lead plaster is subjected to plate coating, solidification, drying and formation to prepare the rear-earth modified positive electrode grid of the lead storage battery. The method is simple, reduces the using amount of the rear earth and improves the utilization ratio of the rear earth, avoids the difficulty in preparing the positive electrode grid from the lead-rare earth alloy, is easy to uniformly and quantitatively dope trace rare-earth elements on the surface of the electrode, and realizes the control of the surface performance of the electrode.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials, and in particular relates to a preparation method of a positive plate of a lead storage battery. Background technique [0002] Lead-acid batteries have the advantages of simple structure, convenient use, reliable performance, and low price. Therefore, they are widely used in various sectors of the national economy. They have always been the product with the largest output and wide application range in chemical power sources. In terms of R&D and application, the performance of lead-acid batteries has been greatly improved, and the advantages of new lead-acid batteries in some special application fields have become more apparent. As electric mopeds, special electric vehicles, and new-type automobile power supplies, they are still mainstream power supplies in the near future. However, the characteristics of high-current discharge of power-type lead-acid batteries currently...

AI Technical Summary

Problems solved by technology

[0022] 1. There are problems of corrosion and reduced conductivity of the positive grid during use: during the use of the positive grid, especially under the operating conditions of overcharging, the grid is prone to oxidation reaction, corrosion and reduced conductivity;

[0023] 2. The performance deterioration of the positive active material: With the increase of the number of charge and discharge cycles, the discharge capacity gradually decreases

The main problem is that the particle binding force is reduced, the electrical contact is broken, and the resistance increases accordingly

In addition, in the later stage of each charge, oxygen is precipitated on the positive electrode, and under the impact of oxygen evolution, it further promotes the weakening of the binding force of the active material, resulting in the falling off of the active material and the poor combination of the grid and the active material. Easy to soften and fall off; the electrode reaction is preferentially carried out on the electrode surface, and the reaction product PbSO 4 As a poor conductor, the internal resistance of the battery increases with discharge, while PbSO 4 PbO 2 Encased, the molar volume is larger than that of PbO 2 PbSO 4 The orifice of the porous electrode is blocked, so that the reactant H 2 SO 4 It cannot diffuse smoothly into the depth of the electrode, resulting in more unreacted substances remaining, resulting in a decrease in the utilization rate of positive active substances

[0024] 3. The matching problem between the active material of the positive plate of the lead-acid battery and the positive grid: in the prior art, the positive grid and the positive active material are basically mechanically attached, there is insufficient contact adhesion, and there is positive activity during the use of the lead-acid battery The problem of shedding of substances

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