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A kind of preparation method of the AGM separator of high specific surface area

A specific surface area and separator technology, applied in the direction of separators/films/diaphragms/spacers, structural parts, electrical components, etc., can solve the problem of reducing battery electrolyte stratification, reducing the diffusion flux of acidic media, and assembly pressure Poor and other problems, to achieve the effect of promoting acid-carrying capacity, improving acid-carrying capacity, and increasing the tortuosity factor

Active Publication Date: 2019-05-21
上饶市安纳拓新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, the particle size of nano silicon oxide is 1.5-10nm, and the specific surface area is 680-1100㎡ / g. The AGM separator with high specific surface area is prepared. The glass fiber separator material has a more complex zigzag channel structure, which improves the separator The specific surface area of ​​the plate; the tortuosity factor of the pore structure of the separator is increased, and the diffusion flux of the acidic medium is greatly reduced, thus improving the acid-carrying capacity of the separator and greatly reducing the stratification of the electrolyte inside the battery; A rich porous network structure is formed in the separator, coupled with the porosity of the separator itself, the wet elasticity of the separator is enhanced, which effectively solves the problems of low wet elasticity and poor assembly pressure holding capacity of the AGM separator; at the same time, complex twists and turns The pore structure can eliminate the phenomenon that the positive electrode active material forms dendrites and punctures the separator to cause micro-short circuit

Method used

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  • A kind of preparation method of the AGM separator of high specific surface area

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preparation example Construction

[0057] Such as figure 1 Shown, the preparation method of the AGM separator of high specific surface area among the present invention, can comprise the following steps:

[0058] (1) Preparation of nano-silica aqueous dispersion: add appropriate amount of water to an emulsifier, add 0.05-1.47% dispersant, stir at room temperature for 1-3 minutes; add 0.1-10% nano-silica, beat at high speed for 15 ~ 30 minutes, so that the mass fraction of the nano silicon dioxide aqueous dispersion is 0.1 ~ 10% (especially 7.5 ~ 10%);

[0059] In this process, an emulsifying machine is used for high-speed beating, which is determined by the small particle size of nano-silica and easy agglomeration. High-speed beating is conducive to the dispersion of nano-silica;

[0060] When the concentration of nano-silicon oxide exceeds 10%, the nano-silicon oxide solution presents a viscous paste;

[0061] (2) Ingredients and beating: Add appropriate amount of water to the beating machine, add retention a...

Embodiment 1

[0082] A kind of AGM separator of high specific surface area in the present embodiment is made up of fibrous material and nano-silica; Wherein, fiber material is glass fiber and polyester fiber; In the AGM separator of this high specific surface area, The mass percentage of glass fiber is 91.9%, the mass percentage of polyester fiber is 8%, and the mass percentage of nano silicon dioxide is 0.1%.

[0083] During specific preparation, according to the following steps:

[0084] (1) Preparation of nano-silicon dioxide aqueous dispersion: add an appropriate amount of water to an emulsifier, add nano-silicon dioxide, and beat at a high speed for 15 to 30 minutes, so that the mass fraction of the nano-silicon dioxide aqueous dispersion is 0.1 to 10%;

[0085] (2) Ingredients and beating: add appropriate amount of water to the beating machine, add glass fiber, beating for 15-20 minutes; add polyester fiber, beating for 4-8 minutes;

[0086] (3) Slurry mixing and slag removal: dilute...

Embodiment 2

[0094] A kind of AGM separator of high specific surface area in the present embodiment is made up of fibrous material and nano silicon dioxide; Wherein, fiber material is glass fiber; In the AGM separator of this high specific surface area, the quality of glass fiber The percentage is 90%, and the mass percentage of nano silicon dioxide is 10%.

[0095] During specific preparation, according to the following steps:

[0096] (1) Preparation of nano-silica aqueous dispersion: add an appropriate amount of water to an emulsifier, add nano-silica, and beat at a high speed for 15-30 minutes, so that the mass fraction of nano-silica aqueous dispersion is 7.5-10%;

[0097] (2) Ingredients and beating: Add appropriate amount of water into the beating machine, add glass fiber, and beat for 15 to 20 minutes;

[0098] (3) Slurry mixing and slag removal: dilute with water so that the mass concentration of the diluted slurry is 0.1-0.4%, adjust the pH value to 2.0-3.5, and then carry out s...

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Abstract

The invention discloses a method for preparing an AGM separator with high specific surface area. The method comprises the following steps: preparing glass fiber slurry from water and glass fibers, adding water for diluting, and regulating the pH value; performing negative pressure suction filtration and dehydration so as to obtain a primary molded wet separator; and applying nanosized silica aqueous dispersion to the surface of the wet separator, performing negative pressure suction filtration and dehydration so as to obtain a secondary molded wet separator, and drying, thereby obtaining the AGM separator with high specific surface area. The AGM separator with high specific surface area disclosed by the invention can achieve the effects of improving the stability and uniformity of a colloidal network structure and improving the layering phenomenon of electrolyte; meanwhile, the problem that the AGM separator is low in wet elasticity and low in assembly pressure retaining capacity is effectively solved, the pore size of the separator can be greatly reduced, the performance of preventing short circuit caused by dendrite puncture can be further improved, capacity degradation of a storage battery is retarded, and the cycle service life of the storage battery is prolonged.

Description

technical field [0001] The invention belongs to the field of storage batteries, and more specifically relates to a method for preparing an AGM separator with a high specific surface area, and the separator is suitable for lead-acid batteries. Background technique [0002] The battery separator is a porous insulating material, which is placed between the positive and negative plates of the battery to separate the positive and negative plates and play the role of insulation to avoid short circuit of the battery. At the same time, the ions that participate in the chemical reaction are allowed to pass through during the charging and discharging process of the battery. For the sealed maintenance-free battery, it is also necessary to ensure that the oxygen precipitated from the positive electrode reaches the negative electrode through the separator to complete the hydrogen-oxygen recombination reaction. Therefore, as an important part of the battery, the separator plays a decisive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/409Y02E60/10
Inventor 徐翠云李翔汪程红王成
Owner 上饶市安纳拓新材料有限公司