A kind of method of rare earth modified lead storage battery negative plate

Abstract

The invention discloses a method using rare earth for modification of a lead storage battery negative electrode plate, in the battery formation process of the lead storage battery negative electrode plate, a rare earth sulfate or rare earth oxide is added into a battery formation fluid, reduction reaction of rare earth ions is performed at a negative electrode for modification of a lead storage battery negative electrode plate, while transition of a lead compound on the negative electrode plate into lead dioxide, rare earth modification of a negative electrode plate gate and a negative electrode active material can be realized, and the lead storage battery performance can be improved. The method is simple, some trace rare earth is easy to be uniformly and quantitatively incorporated on the electrode surface, the control of the electrode surface performance can be realized, investment in equipment is low, process improvement is large, the method can adapt to different electrodes, greatly reduces the dosage of the rare earth and improves the utilization rate of the rare earth; by use of the electrochemical technique for rare earth modification on the electrode surface, the dosage of the rare earth is greatly reduced, the utilization rate of the rare earth is improved, large-scale industrialization is facilitated, and the control of the electrode surface performance can be realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative plates of lead storage batteries, and in particular relates to a method for modifying the negative plates of lead storage batteries with rare earths. 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 high-current discharge characteristics of po...

AI Technical Summary

Problems solved by technology

[0014] (1) There is a problem of reduced conductivity of the negative grid during use: coarse lead sulfate (PbSO 4 ) dendrites, lead sulfate (PbSO 4 ) Dendrites have high resistivity, this coarse lead sulfate (PbSO 4 ) is difficult to charge, requiring a high charging voltage of the battery, resulting in a decrease in the conductivity of the negative grid

[0015]Deterioration of the electrochemical performance of the negative electrode active material: when the lead electrode is discharged, the lead loses electrons to form lead sulfate (PbSO4) crystals, lead sulfate (PbSO4) crystals cover the surface of the negative electrode active material, when the lead sulfate (PbSO4) reaches a certain thickness, the negative electrode active material and electrolysis Difficulty in contact with the liquid prevents the active material of the negative electrode from continuing to react and passivates the lead negative electrode. As the number of charge-discharge cycles increases, the discharge capacity gradually decreases; the electrode reaction is preferentially carried out on the electrode surface, and the reaction product lead sulfate (PbSO4 ) is a poor conductor, which increases the internal resistance of the battery with discharge, making it difficult for the reactant H2SO4 to diffuse deep into the electrode, resulting in residual More unreacted substances, resulting in lower utilization of negative electrode active substances

[0016] The matching problem of the active material of the negative plate of the lead storage battery and the negative grid: in the prior art, the negative grid and the negative active material are basically mechanically attached, and there is contact wrapping Insufficient adhesion, and there is a problem that the negative active material falls off during the use of lead-acid batteries

[0019] (1) The performance of the negative plate electrode is reduced: during the use of the negative plate pre-electrolytically treated by the electrochemical reduction method, because the rare earth substances on the electrode surface are easy to enter the sulfuric acid solution during the charging and discharging process of the battery, reducing the The content of rare earth substances in the negative plate will reduce the performance of the battery during the use of the battery

[0020] (2) The preparation conditions of the negative plate are inconsistent with the conditions of use: the rare earth modified negative plate is prepared by the electrochemical pre-electrolysis method by adding rare earth to the sulfuric acid aqueous solution to improve the performance of the lead-acid battery. However, when the rare earth modified negative plate improves the performance of the lead-acid battery during use In the process, there is a reduction in the content of rare earth substances in the negative plate, and the performance of the battery will decrease during the use of the battery

[0021] (3) Process pollution: After the pre-electrolysis treatment, washing, drying and other operation steps are required to produce a large amount of acid mist and waste acid, which not only reduces the utilization efficiency of resources, but also pollutes the ambient temperature

[0022] (4) Pre-electrolysis treatment: Electrochemical treatment is performed in the pre-electrolysis equipment, resulting in an increase in equipment and operating units

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