Gel electrolyte capable of prolonging service life of lead-acid battery

Abstract

The invention discloses gel electrolyte capable of prolonging the service life of a lead-acid battery. The gel electrolyte contains the following raw materials in percentage by weight: 0.1 to 0.5 percent of polyethylene glycol, 0.1 to 1 percent of stannous sulfate, 0.5 to 1.5 percent of sodium sulfate, 0.5 to 1 percent of phosphoric acid, 0.05 to 2 percent of an organic silicon polymer, 0.5 to 8 percent of fumed silica, 35 to 45 percent of sulfuric acid and the balance being de-ionized water. According to the gel electrolyte, the polyethylene glycol is used as a colloid stabilizer and can prevent colloids from being gelled or agglomerated before being filled into the battery and enhance the stability of the colloids to form a stable three-dimensional mesh structure; the stannous sulfate can be oxidized into stannic tin to improve the electrical conductivity of an active substance and the recharging capability of the battery which is discharged; the sodium sulfate can provide a certain quantity of sulfate radicals for electrochemical reaction in the electrolyte to reduce the degree of supersaturation of lead sulfate crystals; silicon-oxygen bonds and hydrogen bonds in the organic silicon polymer can effectively reduce the softening speed of the active substance, inhibit the passivation of the active substance on the surface layer and prolong the service life of the battery.

Description

technical field [0001] The invention belongs to the field of lead-acid batteries, and in particular relates to a colloidal electrolyte capable of improving the service life of lead-acid batteries. Background technique [0002] Since the lead-acid battery was invented in 1859, it has been used in many fields such as electric power, transportation, communications, automobiles, and railways because of its wide range of raw materials, low price, reliable performance, and wide applicable temperature range. After more than 100 years of technological innovation, battery energy density, cycle life and high-current discharge capacity have been continuously improved, and currently it still has the largest market share in the field of chemical power sources. The main structure of the lead-acid battery is composed of positive electrode, negative electrode, electrolyte, diaphragm, shell, safety valve, terminal and other components. Part of the electrolyte in the valve-regulated lead-aci...

AI Technical Summary

Problems solved by technology

[0003]However, during the use of lead-acid batteries, it is found that early capacity loss will occur. Anatomical analysis of the failure causes of lead-acid batteries returned from the market shows that the largest proportion is The active material of the positive plate softens and falls off, resulting in a decrease in battery capacity and end of life

However, as the battery cycle progresses, the softening of the active material of the positive electrode is inevitable, because during the charge and discharge of the battery, the continuous transformation of the active material causes the volume of the positive electrode to expand and shrink, and the binding force decreases.

In order to delay its adverse effects on the battery, most companies and research institutions are looking for different additives to slow down the softening of the active material, such as conductive agents, fiber additives, organic additives, etc., to improve the strength of the positive active material and prolong the battery life, but the effect is not good. significantly