Method for preparing glass fiber separator for lead carbon battery with double functions of in-situ pore enhancement and negative electrode hydrogen evolution suppression

A glass fiber separator, hydrogen evolution suppression technology, applied in the direction of lead-acid batteries, secondary battery repair/maintenance, secondary batteries, etc., can solve the problems of high price, affecting the distribution of charging and discharging current, and high assembly pressure, etc., to improve The effect of hydrogen evolution overpotential, improving oxygen recombination efficiency, and reducing self-discharge

Active Publication Date: 2018-10-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare metals are used to set the catalytic plug, which is expensive; the method of increasing the oxygen channel of the separator (the plane pore size is 10-25 μm, and the average pore size after three-dimensional superposition is 10-15 μm is better). The plate deforms or even collapses, which affects the current distribution during charging and discharging, which in turn causes adverse effects such as lead dendrites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 200 mL of water, 50 g of superfine glass fiber with a diameter of 0.5 to 1.5 μm, 40 g of ordinary glass fiber with a diameter of 1.5 to 3 μm, and 5 g of Na 2 SiO 3 9H 2 O, 5g organic polymer fiber, 0.3g fibrous Al 2 o 3 , 3g spherical Al 2 o 3 , 1.5gSnO, 0.5g sodium dodecylsulfonate, after stirring and beating for 10min, dilute the slurry with 5% dilute sulfuric acid and adjust the pH to 6, and continue stirring for 30min; There is no droplet forming within 10s (the moisture content of the separator is measured to be 33%).

[0030] The above-mentioned formed separators are finally made into AGM separator products through drying, trimming, slicing and other processes. After testing, the modified glass fiber separators have a maximum pore size of 13 μm, a porosity of 82%, and a capillary acid absorption height of 81mm / 5min.

[0031] Take the glass fiber separator and fix it with plastic mesh on both sides, add 1.28g / cm 3 Sulfuric acid solution for washing, washin...

Embodiment 2

[0034] Add 200mL of water, 50g of ultra-fine glass fiber with a diameter of 0.5-1.5μm, 40g of ordinary glass fiber with a diameter of 1.5-3μm, 10g of Na 2 SiO 3 9H 2 O, 5g organic polymer fiber, 0.3g fibrous Al 2 o 3 , 2g spherical Al 2 o 3 , 1gSnO, 0.5g sodium dodecylsulfonate, after stirring and beating for 10min, dilute the slurry with 5% dilute sulfuric acid and adjust the pH to 6, continue stirring for 30min; then vacuum filter the above slurry to the filter port Within 10s, there is no dripping and forming (the moisture content of the separator is measured to be 36%).

[0035] The above-mentioned formed separators are finally made into AGM separator products through drying, trimming, slicing and other processes. After testing, the modified glass fiber separators have a maximum pore size of 13 μm, a porosity of 80%, and a capillary acid absorption height of 79mm / 5min.

[0036] Take the glass fiber separator and fix it with plastic mesh on both sides, add 1.28g / cm 3...

Embodiment 3

[0039] Add 200 mL of water, 50 g of superfine glass fiber with a diameter of 0.5 to 1.5 μm, 40 g of ordinary glass fiber with a diameter of 1.5 to 3 μm, and 5 g of Na 2 SiO 3 9H 2 O, 5g organic polymer fiber, 0.3g fibrous Al 2 o 3 , 3g spherical Al 2 o 3 , 1.5g bismuth oxide, 0.5g sodium hexametaphosphate, after stirring and beating for 10 minutes, dilute the slurry with 5% dilute sulfuric acid and adjust the pH to 6, continue stirring for 30 minutes; then vacuum filter the above slurry to the filter port Within 10s, there is no dripping and forming (the moisture content of the separator is measured to be 33%).

[0040] The above-mentioned formed separators are finally made into AGM separator products through drying, trimming, slicing and other processes. After testing, the modified glass fiber separators have a maximum pore size of 12 μm, a porosity of 80%, and a capillary acid absorption height of 80mm / 5min.

[0041] Take the glass fiber separator and fix it with plast...

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Abstract

The invention discloses a method for preparing a glass fiber separator for a lead carbon battery with double functions of in-situ pore enhancement and negative electrode hydrogen evolution suppression. The method comprises the following steps of: first preparing glass fiber separator slurry; then adding an additive with double functions of in-situ pore enhancement and negative electrode hydrogen evolution suppression thereto; using dilute sulphuric acid to dilute and adjust a pH value of the slurry; filtering and molding the slurry to obtain a semi-finished product of the glass fiber separator; and drying, trimming, slicing the semi-finished product or the like to prepare the glass fiber separator for the lead carbon battery with double functions of in-situ pore enhancement and negative electrode hydrogen evolution suppression. According to the method for preparing the glass fiber separator for the lead carbon battery, particles of the additive that are acid-soluble and have the doublefunctions of in-situ pore enhancement and negative electrode hydrogen evolution suppression are added and evenly distributed on the glass fiber separator. The glass fiber separator is used between positive and negative electrodes of the lead carbon battery. When acid is added during manufacturing of the lead carbon battery, the double-function micro-scale additive particles in the separator are dissolved and released ions. The released ions are directionally adsorbed, electroreduced, and deposited on a surface of a carbon material during a charging process. Therefore, the negative electrode hydrogen evolution overpotential is improved, the side reaction of the hydrogen evolution is suppressed, and the self-discharge during storage of the battery is reduced.

Description

technical field [0001] The invention relates to the technical field of lead-carbon batteries, in particular to a method for preparing a glass fiber separator for lead-carbon batteries with dual functions of in-situ pore enhancement and negative electrode hydrogen evolution suppression. Background technique [0002] Lead-carbon battery is a negative capacitor type lead-acid battery, which combines the characteristics of lead storage battery and supercapacitor. Adding activated carbon to the negative electrode active material of the battery can significantly improve the cycle life of the lead-acid battery, and has excellent high-current charge and discharge performance. However, due to the introduction of carbon materials into the negative electrode and the characteristics of high-current charging and discharging, lead-carbon batteries have the problems of easy hydrogen evolution at the negative electrode during battery storage or charging and low oxygen recombination efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/42H01M10/06H01M50/403H01M50/44
CPCH01M10/06H01M10/4235H01M50/431H01M50/44H01M50/403Y02E60/10
Inventor 高云芳徐新万火军
Owner ZHEJIANG UNIV OF TECH
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