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Diaphragm for nickel secondary battery and preparation method of diaphragm

A secondary battery and nickel-based technology, which is applied in the direction of nickel storage battery, alkaline storage battery, battery pack components, etc., can solve the problems of unproven diaphragm stability, easy-to-crack surface performance, low ion conductivity, etc., and achieve strong resistance Good alkali corrosion, good rate discharge performance, and fast liquid absorption

Pending Publication Date: 2020-07-24
SHENZHEN EPT BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of this diaphragm remains to be verified.
[0007] In order to develop a battery separator with excellent performance, researchers have made a lot of explorations. At present, the separator still has problems such as too thin, easy to crack, or low surface performance and low porosity, resulting in low ion conductivity. Therefore, it is urgent to provide a A battery separator that can not only ensure the excellent performance of the separator in all aspects, but also promote the performance of the battery in all aspects

Method used

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  • Diaphragm for nickel secondary battery and preparation method of diaphragm
  • Diaphragm for nickel secondary battery and preparation method of diaphragm
  • Diaphragm for nickel secondary battery and preparation method of diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a diaphragm for a nickel-based secondary battery, comprising the following steps:

[0038] (1) Preparation of PE film layer: 100g of PE fine fibers with a diameter of 5 μm are evenly dispersed in 10,000 mL of water, dehydrated on the forming net to form a fine fiber network layer, and then press and strengthen by mechanical means to obtain fine fibers with a thickness of 30 μm The net layer of non-woven fabric is fluorinated with hydrogen fluoride at a concentration of 2mol / L to obtain a PE film layer. The temperature of the fluorinated treatment is 60°C, and the fluorinated speed is 10μg / 100cm 2 *h.

[0039] (2) Preparation of PP film layer: 100g of PP crude fibers with a diameter of 10 μm are evenly dispersed in 10000mL of water, dehydrated on the forming net to form a coarse fiber network layer, and then reinforced to obtain a thick fiber network layer with a thickness of 55 μm. Cloth, and then use acrylic acid with a concentration of 0.8mol / L...

Embodiment 2

[0043] (1) Preparation of PE film layer: 100g of PE fine fibers with a diameter of 3 μm are evenly dispersed in 10000 mL of water, dehydrated on the forming net to form a fine fiber net layer, and then press and strengthen by mechanical means to obtain fine fibers with a thickness of 50 μm The net layer of non-woven fabric is fluorinated with hydrogen fluoride at a concentration of 1.5mol / L to obtain a PE film layer. The temperature of the fluorinated treatment is 55°C, and the fluorinated speed is 9μg / 100cm 2 *h.

[0044] (2) Preparation of PP film layer: Evenly disperse 100g of PP crude fibers with a diameter of 15μm in 10000mL of water, dehydrate on the forming net to form a coarse fiber network layer, and then perform reinforcement treatment to obtain a thick fiber network layer with a thickness of 30μm. Cloth, and then use acrylic acid with a concentration of 1.0mol / L to perform grafting treatment to obtain a PP film layer, wherein the temperature of the grafting treatmen...

Embodiment 3

[0048] (1) Preparation of PE film layer: 100g of PE fine fibers with a diameter of 8 μm are evenly dispersed in 10000 mL of water, dehydrated on the forming net to form a fine fiber network layer, and then press and strengthen by mechanical means to obtain fine fibers with a thickness of 10 μm The net layer of non-woven fabric is fluorinated with hydrogen fluoride at a concentration of 2.5 mol / L to obtain a PE film layer. 2 *h.

[0049] (2) Preparation of PP film layer: Evenly disperse 100g of PP crude fibers with a diameter of 5 μm in 10000 mL of water, dehydrate on the forming net to form a coarse fiber network layer, and then perform reinforcement treatment to obtain a thick fiber network layer with a thickness of 80 μm. Cloth, and then use acrylic acid with a concentration of 0.6mol / L to perform grafting treatment to obtain a PP film layer, wherein the temperature of the grafting treatment is 75°C.

[0050] (3) Compounding of PE film layer and PP film layer: roll the PE f...

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Abstract

The invention discloses a diaphragm for a nickel secondary battery and a preparation method of the diaphragm, and belongs to the technical field of battery diaphragms. The diaphragm is a three-layer diaphragm structure composed of PP / PE / PP in a stacking mode, a PE diaphragm layer and a PP diaphragm layer are prepared firstly, then the PE diaphragm layer and the PP diaphragm layer are subjected toroll-in compounding in the PP / PE / PP stacking mode, and the diaphragm for the nickel secondary battery is obtained. PE fine fibers are dispersed in water to form a fine fiber net layer, reinforcement treatment is performed to obtain fine fiber net layer non-woven fabrics, and fluorination treatment is performed to obtain the PE diaphragm layer; and PP crude fibers are dispersed in water to form a crude fiber net layer, reinforcement treatment is performed to obtain crude fiber net layer non-woven fabrics, and grafting treatment is performed to obtain the PP diaphragm layer. The battery diaphragm prepared in the invention not only ensures a cycle life of the battery, but also has better discharge efficiency.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and in particular relates to a separator for a nickel-based secondary battery and a preparation method thereof. Background technique [0002] Nickel-based secondary batteries have been widely concerned because of their low cost, and their types mainly include iron-nickel batteries, cadmium-nickel batteries, hydrogen-nickel batteries, or zinc-nickel batteries. As we all know, the three key materials of secondary batteries include positive electrode material, negative electrode material and diaphragm material, and diaphragm material is the most critical material in the battery structure. It separates the positive and negative electrodes of the battery to prevent the positive and negative electrodes from being active Substances come into contact with each other and a short circuit occurs, which affects the cycle life of the battery. [0003] Currently, commonly used battery separator mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/30H01M50/403H01M50/44H01M50/457H01M50/489H01M50/491
CPCH01M10/30H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 梁德声曹胜龙黄英杰王守军
Owner SHENZHEN EPT BATTERY
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