High-temperature heavy-load negative lead paste for start-stop battery and preparation method of negative lead paste

Abstract

The invention relates to a high-temperature heavy-load negative lead paste for a start-stop battery and a preparation method of the negative lead paste, and belongs to the technical field of electrochemistry. The high-temperature heavy-load negative lead paste for the start-stop battery is prepared from the following components: dilute sulfuric acid with the density rho of 1.38g / mL, deionized water, a high-performance organic additive Expander 1, a high-performance organic additive Expander 2, a conductive polyester staple fiber, barium sulfate, a carbon material additive Carbon A and lead powder. The invention provides the high-temperature heavy-load negative lead paste for the start-stop battery with long service lifetime and deep discharge cycle performance under the partial state of charge and a preparation method of the negative lead paste. The negative electrode produced by the formula can significantly improve sulfation of the negative electrode under the partial state of charge, reduces the electrochemical polarization phenomenon of the battery in the high-temperature deep circulating charge and discharge processes, and improves the conductivity and the electrochemical property of the negative electrode and the thermodynamic structure stability, so that the high-temperature deep discharge cycle lifetime of the negative electrode under the partial state of charge is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a high-temperature heavy-duty start-stop battery negative lead paste and a preparation method thereof. Background technique [0002] At present, the sealed maintenance-free start-stop lead-acid batteries mostly use Pb-Ca alloy as the grid, but when Pb-Ca alloy is used as the positive grid, under high temperature conditions, the corrosion and growth of the positive grid are serious; at the same time, the negative grid is generally used Traditional organic additives, and the current traditional organic additives generally use sodium lignosulfonate and humic acid with a high degree of sulfonation. Under high temperature conditions, they all have significant shortcomings such as insufficient thermal stability, resulting in the loss of lignin in the negative electrode at the end of the cycle life. Sodium sulfonate dissolves from the negative electrode into the ele...

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Problems solved by technology

[0004] (1) Use Pb-Sb-Cd or add rare earth elements or even Ag alloys to Pb-Ca-Sn-Al alloys to replace traditional Pb-Ca-Sn-Al alloys, but in the late cycle of Pb-Sb-Cd alloys, Sb Elements will dissolve from the positive electrode, reach the negative electrode through electromigration, and undergo electrochemical reduction deposition on the negative electrode to enter the spongy metal lead to form a Pb-Sb alloy at the negative electrode, thereby reducing the hydrogen evolution potential of the negative electrode, causing the self-discharge of the negative electrode to intensify, and causing serious damage. Dehydration problem, at the same time, due to the high toxicity of Cd, the country has banned its use at present, and adding rare earth elements, the current industry generally cannot accurately control the phenomenon of element content rising in the process of rare earth alloy configuration, and Ag is expensive and difficult to industrialize.

[0005] (2) The apparent density of the traditional negative electrode paste has a process control index of 4.1-4.2g / cm 2 , within this density range, the negative electrode performance, especially the early stage performance, will be better. When the coating is increased, the apparent density of the negative electrode lead paste will reach 4.4g / cm 2 Even 4.4g / cm 2 As mentioned above, this measure can barely improve part of the deep cycle performance of the negative electrode, but the significant increase in the apparent density of the negative electrode paste will affect the porosity and pore size distribution of the negative electrode active material, and have a serious negative impact on the early performance such as low temperature performance and charge acceptance. , and the apparent density of the negative electrode paste is too high, which has higher requirements for the filling process and equipment

[0006] (3) Some electrolyte additives are used, but the electrolyte additives can only increase the conductivity of the electrode itself and improve some initial performance of the battery. There is no reason for the decline in deep cycle performance caused by the high temperature failure of the negative organic additives in the partially charged state. Improvement

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