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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, which is applied in the field of preparation of lead-acid batteries and AGM separators, can solve the problems of reducing battery electrolyte stratification, acidic medium diffusion flux reduction, assembly pressure difference, etc., to improve stratification Phenomenon, promotion of acid-carrying capacity, enhancement of wet elasticity

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

[0049] like figure 1 As shown, the preparation method of the AGM separator with high specific surface area in the present invention may comprise the following steps:

[0050] (1) Preparation of nano-silica water dispersion: add an appropriate amount of water to the emulsifier, add 0.05-1.47% of dispersant, and stir at room temperature for 1-3 minutes; add 0.1-10% of nano-silica, beat at high speed for 15 minutes ~30 minutes, so that the mass fraction of the nano-silica aqueous dispersion is 0.1-10% (especially 7.5-10%);

[0051] In this process, the emulsifier 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;

[0052] When the concentration of nano-silica exceeds 10%, the nano-silica solution presents a viscous paste;

[0053] (2) Batching and beating: add an appropriate amount of water to the beating machine, add in (1) nano-silica aqueous di...

Embodiment 1

[0070] An AGM separator with high specific surface area in this embodiment is composed of fibrous materials and nano-silica; wherein, the fibrous materials are glass fibers and polyester fibers; in the AGM separator with high specific surface area, The mass percentage of glass fiber is 99%, the mass percentage of polyester fiber is 0.9%, and the mass percentage of nano-silica is 0.1%.

[0071] During specific preparation, follow the steps below:

[0072] (1) Preparation of nano-silica aqueous dispersion: add an appropriate amount of water to the emulsifier, add nano-silica, and beat at high speed for 15-30 minutes, so that the mass fraction of the nano-silica aqueous dispersion is 0.1-10%;

[0073] (2) Batching and beating: add an appropriate amount of water to the beating machine, and then add the nano-silica aqueous dispersion in (1) in turn; adjust the pH to 2.0-3.5, add glass fiber, and beat for 15-20 minutes; polyester fiber , beat for 4 to 8 minutes;

[0074] (3) Sizin...

Embodiment 2

[0080] An AGM separator with high specific surface area in this embodiment is composed of fibrous materials and nano-silica; wherein, the fibrous materials are glass fibers and polyester fibers; in the AGM separator with high specific surface area, The mass percentage of glass fiber is 84%, the mass percentage of polyester fiber is 6%, and the mass percentage of nano silica is 10%.

[0081] During specific preparation, follow the steps below:

[0082] (1) Preparation of nano-silica aqueous dispersion: adding an appropriate amount of water to the emulsifier, adding nano-silica, and beating at high speed for 15-30 minutes, so that the mass fraction of the nano-silica aqueous dispersion is 7.5-10%;

[0083] (2) Batching and beating: add an appropriate amount of water to the beating machine, and then add the nano-silica aqueous dispersion in (1) in turn; adjust the pH to 2.0-3.5, add glass fiber, and beat for 15-20 minutes; polyester fiber , beat for 4 to 8 minutes;

[0084] (3)...

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Abstract

The invention discloses a method for preparing an AGM separator with a high specific surface area, which comprises the following steps: preparing a mixed slurry with water, nano silicon dioxide and glass fiber, the particle size of the nano silicon dioxide is 1.5-10nm, and the ratio is The surface area is 680-1100㎡ / g; then dilute with water to adjust the pH value; then, perform negative pressure suction filtration and dehydration to obtain a wet separator, and then dry the wet separator to obtain an AGM separator with a high specific surface area. The AGM separator with high specific surface area of ​​the present invention can improve the stability and uniformity of the colloidal network structure and improve the stratification of the electrolyte; at the same time, it can effectively solve the problems of low wet elasticity and poor assembly pressure holding capacity of the AGM separator. The hole diameter of the plate can be greatly reduced, which can further improve the preventive performance of short circuit caused by dendrite puncture, slow down the capacity decline of the battery, and prolong the cycle service life of the battery.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/06B82Y30/00
CPCB82Y30/00H01M10/06H01M50/403H01M50/446Y02E60/10
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