A long-life deep cycle positive electrode grid alloy and its preparation method

Abstract

The invention discloses a long-service-life deep-cycle lead-acid battery positive grid alloy which is composed of the following raw materials in percentage by mass: 0.05-0.12% of calcium, 0.1-2.0% of tin, 0.01-0.1% of aluminum, 0.01-0.2% of zinc, 0.01-0.2% of silver and the balance of lead. The alloy has favorable corrosion resistance, and does not influence the deep cycle performance of the battery. The addition of the zinc can well enhance the deep cycle performance and low-temperature properties of the battery. The addition of the silver can enhance the corrosion resistance of the grid alloy; and the comparison between Figure 1 and Figure 2 indicates that the silver can be enriched at the grain sub-boundary and grain boundary along with the tin, and the silver enriched at the grain boundary can enhance the corrosion resistance of the grain boundary, thereby prolonging the service life of the alloy grid.

Description

Technical field

[0001] The invention belongs to the field of lead-acid batteries, and relates to a long-life deep-cycle lead-acid battery positive grid alloy and a preparation method thereof. Background technique

[0002] The grid is an important part of the lead-acid battery. Although it does not directly improve the capacity, it plays a role as a skeleton support for the active material and conducts and evenly distributes the current during the charging and discharging of the battery. These properties directly limit The battery capacity and cycle life, and whether these properties are superior mainly depends on the alloy used in the grid.

[0003] The grid material of traditional lead-acid batteries is mainly lead-antimony-cadmium alloy. The casting performance and mechanical properties of this alloy can meet the needs of battery production and use, and the corrosion layer formed by it has good electrical conductivity, which can basically inhibit the PCL phenomenon . However, t...

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