Colloid electrolyte capable of improving service life of lead-acid cell

Abstract

The invention discloses a colloid electrolyte can improve the service life of a lead-acid cell, and the colloid electrolyte comprises the following raw materials by weight: 0.1-0.5% of polyethylene glycol, 0.1-1% of stannous sulfate, 0.5-1.5% of sodium sulfate, 0.5-1% of phosphoric acid, 0.05-2% of organosilicon polymer, 0.5-8% of fumed silica, 35-45% of sulfuric acid, and balanced of deionized water. The polyethylene glycol as a colloid stabilizer can prevent the occurrence of colloid coacervation or agglomeration before colloid is poured into the cell, colloidal stability is enhanced, and a stable three-dimensional network structure is formed; the stannous sulfate can be oxidized to tetravalent tin, the active material electrical conductivity and recharge ability after the cell is discharged can be improved, the sodium sulfate in the electrolyte can provides a certain amount of sulfate radicals for the electrochemical reaction, the degree of supersaturation of lead sulfate crystals can be reduced, formation of a lead sulfate layer with poor electrical conductivity can be prevented; the phosphoric acid can refine the grain diameter of the lead sulfate crystals; and silicon oxygen bonds and hydrogen bonds in the organosilicon polymer can effectively reduce the active material softening speed, inhibit the surface active material passivation, and improve the service life of the cell.

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