Gel battery electrolyte and preparation method therefor

Abstract

The invention discloses a gel battery electrolyte. The gel battery electrolyte comprises the ingredients in percentage by mass: 4-8% of silicon dioxide, 0.6-2% of anhydrous sodium sulfate, 0.2-0.8% of phosphoric acid, 21.5-38.4% of sulfuric acid and the balance of water. The invention also discloses a preparation method for the gel battery electrolyte, wherein the preparation method comprises the steps of (1) mixing silicon dioxide with water, and preparing a gel mother liquid under a high-speed shearing effect; (2) preparing a dilute sulfuric acid solution, and adding anhydrous sodium sulfate and phosphoric acid to obtain a mixed solution; and (3) adding the obtained gel mother liquid into the mixed solution, and rapidly stirring to obtain the gel battery electrolyte. Due to the synergetic cooperation and the reasonable adding sequence of the materials with the proportion, the prepared electrolyte is capable of effectively eliminating hydration layering, long in cycle life and excellent in charging-discharging performance at a low temperature environment; and meanwhile, the electrolyte system is stable, low in cost, and good in the operational performance.

Description

technical field

[0001] The invention relates to a lead-acid battery electrolyte and a preparation method thereof, in particular to a gel battery electrolyte and a preparation method thereof. Background technique

[0002] The traditional AGM battery has the following defects: (1) The acid content in the separator is low, and the water loss is large during use, which is easy to cause thermal runaway, which causes a single battery to bulge, and eventually leads to the scrapping of the entire battery pack. (2) The low temperature performance is poor, the low temperature charge and discharge internal resistance is large, the charge acceptance is poor, and the discharge capacity is low. (3) The service life of the deep cycle is short. The acid content of the AGM battery is less than that of the colloidal battery. After the battery is used for a period of time, the water in the AGM battery disappears, resulting in an increase in the acid density and accelerating the corrosion rate ...

Examples

Embodiment 1

[0041] Gel battery electrolyte, the mass percentage is composed of:

[0042]

[0043] The silicon dioxide is prepared by a gas phase method, and the particle size of the silicon dioxide is 10-50nm.

[0044] Specifically prepared by the following steps:

[0045] (1) Mix silica and water, the mass ratio of silica and water is 1:5, configure colloidal mother liquor under high-speed shearing, the speed of high-speed shearing is 3500 rpm, and the shearing time is 5min ;

[0046] (2) the concentrated sulfuric acid that mass fraction is 98% is slowly added in water, the density of gained dilute sulfuric acid aqueous solution is 1.15g / ml, adds required amount of anhydrous sodium sulfate and phosphoric acid to obtain mixed solution;

[0047] (3) Add the obtained colloidal mother liquor into the mixed solution, stir rapidly at 4500 rpm for 10 minutes to obtain a finished product, and the density of the obtained finished colloidal battery electrolyte is 1.20 g / ml.

Embodiment 2

[0049] Gel battery electrolyte, the mass percentage is composed of:

[0050]

[0051] The silicon dioxide is prepared by a gas phase method, and the particle size of the silicon dioxide is 20-60nm.

[0052] Specifically prepared by the following steps:

[0053] (1) Mix silica and water, the mass ratio of silica and water is 1:6, configure the colloidal mother liquor under high-speed shearing, the speed of high-speed shearing is 4000 rpm, and the shearing time is 15min ;

[0054](2) the concentrated sulfuric acid that mass fraction is 98% is slowly added in water, the density of gained dilute sulfuric acid aqueous solution is 1.19g / ml, adds required amount of anhydrous sodium sulfate and phosphoric acid to obtain mixed solution;

[0055] (3) Add the obtained colloidal mother liquor into the mixed solution, stir rapidly at 5000 rpm for 15 minutes to obtain a finished product, and the density of the obtained finished colloidal battery electrolyte is 1.22 g / ml.

Embodiment 3

[0057] Gel battery electrolyte, the mass percentage is composed of:

[0058]

[0059] The silicon dioxide is prepared by a gas phase method, and the particle size of the silicon dioxide is 15-38nm.

[0060] Specifically prepared by the following steps:

[0061] (1) Mix silica and water, the mass ratio of silica and water is 1:8, configure the colloidal mother liquor under high-speed shearing, the speed of high-speed shearing is 4500 rpm, and the shearing time is 25min ;

[0062] (2) the concentrated sulfuric acid that mass fraction is 98% is slowly added in water, the density of gained dilute sulfuric acid aqueous solution is 1.19g / ml, adds required amount of anhydrous sodium sulfate and phosphoric acid to obtain mixed solution;

[0063] (3) Add the obtained colloidal mother liquor into the mixed solution, stir rapidly at 5000 rpm for 15 minutes to obtain a finished product, and the density of the obtained finished colloidal battery electrolyte is 1.25 g / ml.

technical field

[0001] The invention relates to a lead-acid battery electrolyte and a preparation method thereof, in particular to a gel battery electrolyte and a preparation method thereof. Background technique

[0002] The traditional AGM battery has the following defects: (1) The acid content in the separator is low, and the water loss is large during use, which is easy to cause thermal runaway, which causes a single battery to bulge, and eventually leads to the scrapping of the entire battery pack. (2) The low temperature performance is poor, the low temperature charge and discharge internal resistance is large, the charge acceptance is poor, and the discharge capacity is low. (3) The service life of the deep cycle is short. The acid content of the AGM battery is less than that of the colloidal battery. After the battery is used for a period of time, the water in the AGM battery disappears, resulting in an increase in the acid density and accelerating the corrosion rate ...

Examples

Embodiment 1

[0041] Gel battery electrolyte, the mass percentage is composed of:

[0042]

[0043] The silicon dioxide is prepared by a gas phase method, and the particle size of the silicon dioxide is 10-50nm.

[0044] Specifically prepared by the following steps:

[0045] (1) Mix silica and water, the mass ratio of silica and water is 1:5, configure colloidal mother liquor under high-speed shearing, the speed of high-speed shearing is 3500 rpm, and the shearing time is 5min ;

[0046] (2) the concentrated sulfuric acid that mass fraction is 98% is slowly added in water, the density of gained dilute sulfuric acid aqueous solution is 1.15g / ml, adds required amount of anhydrous sodium sulfate and phosphoric acid to obtain mixed solution;

[0047] (3) Add the obtained colloidal mother liquor into the mixed solution, stir rapidly at 4500 rpm for 10 minutes to obtain a finished product, and the density of the obtained finished colloidal battery electrolyte is 1.20 g / ml.

Embodiment 2

[0049] Gel battery electrolyte, the mass percentage is composed of:

[0050]

[0051] The silicon dioxide is prepared by a gas phase method, and the particle size of the silicon dioxide is 20-60nm.

[0052] Specifically prepared by the following steps:

[0053] (1) Mix silica and water, the mass ratio of silica and water is 1:6, configure the colloidal mother liquor under high-speed shearing, the speed of high-speed shearing is 4000 rpm, and the shearing time is 15min ;

[0054](2) the concentrated sulfuric acid that mass fraction is 98% is slowly added in water, the density of gained dilute sulfuric acid aqueous solution is 1.19g / ml, adds required amount of anhydrous sodium sulfate and phosphoric acid to obtain mixed solution;

[0055] (3) Add the obtained colloidal mother liquor into the mixed solution, stir rapidly at 5000 rpm for 15 minutes to obtain a finished product, and the density of the obtained finished colloidal battery electrolyte is 1.22 g / ml.

Embodiment 3

[0057] Gel battery electrolyte, the mass percentage is composed of:

[0058]

[0059] The silicon dioxide is prepared by a gas phase method, and the particle size of the silicon dioxide is 15-38nm.

[0060] Specifically prepared by the following steps:

[0061] (1) Mix silica and water, the mass ratio of silica and water is 1:8, configure the colloidal mother liquor under high-speed shearing, the speed of high-speed shearing is 4500 rpm, and the shearing time is 25min ;

[0062] (2) the concentrated sulfuric acid that mass fraction is 98% is slowly added in water, the density of gained dilute sulfuric acid aqueous solution is 1.19g / ml, adds required amount of anhydrous sodium sulfate and phosphoric acid to obtain mixed solution;

[0063] (3) Add the obtained colloidal mother liquor into the mixed solution, stir rapidly at 5000 rpm for 15 minutes to obtain a finished product, and the density of the obtained finished colloidal battery electrolyte is 1.25 g / ml.

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