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Composite membrane for secondary nickel-zinc cell and preparation method of composite membrane

A composite diaphragm, nickel-zinc battery technology, applied in nickel batteries, alkaline batteries, battery pack components and other directions, can solve the problem of partial dislocation of the diaphragm battery performance, etc., to achieve the battery assembly process is simple and easy, keep flat, not easy to wrinkle pleated effect

Active Publication Date: 2015-11-25
HENAN KEGAO RADIATION CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a composite diaphragm for secondary nickel-zinc battery and its preparation method, so as to overcome the shortcomings of the diaphragm in the prior art that are prone to local dislocation, wrinkles, etc., which affect the performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing a composite diaphragm for a secondary nickel-zinc battery, comprising the following steps: ① placing a polypropylene microporous membrane with a thickness of 10 μm in a surface density of 30 g / m 2 The underside of the non-woven fabric containing ultrafine polyolefin fibers is bonded together by a heat sealing machine at a temperature of 130°C to form a diaphragm substrate; ②The diaphragm substrate prepared in step ① is continuously passed through an electronic Accelerator irradiation, control the beam flow rate of the electron accelerator and the transmission speed of the diaphragm substrate, so that the absorbed dose accepted by the diaphragm substrate is 40kGy; the diaphragm substrate after the radiation is packed into the grafting reactor, sealed, vacuumized, and then Grafting liquid (the grafting liquid in the described step ② is measured by mass percentage, comprises the following components: sodium lauryl sulfate 0.5%, acrylic acid 1.8%, sodi...

Embodiment 2

[0022] A method for preparing a composite separator for a secondary nickel-zinc battery, comprising the following steps: ① placing a polypropylene microporous membrane with a thickness of 45 μm in a surface density of 50 g / m 2 The underside of the non-woven fabric containing ultrafine polyolefin fibers is bonded together by a heat sealing machine at a temperature of 150°C to form a diaphragm substrate; ②The diaphragm substrate prepared in step ① is continuously passed through the electronic Accelerator irradiation, control the beam flow rate of the electron accelerator and the transmission speed of the diaphragm substrate, so that the absorbed dose accepted by the diaphragm substrate is 30kGy; the diaphragm substrate after the radiation is packed into the grafting reactor, sealed, vacuumized, and then The grafting liquid (the grafting liquid in the described step ② is calculated by mass percentage, includes the following components: sodium alkylbenzene sulfonate 3.0%, acrylic a...

Embodiment 3

[0026] A method for preparing a composite diaphragm for a secondary nickel-zinc battery, comprising the following steps: ① placing a polypropylene microporous membrane with a thickness of 25 μm in a surface density of 40 g / m 2 The underside of the non-woven fabric containing ultrafine polyolefin fibers is combined by a heat sealing machine at a temperature of 140°C to form a diaphragm substrate; ②The diaphragm substrate prepared in step ① is continuously passed through the electronic Accelerator irradiation, control the beam flow rate of the electron accelerator and the transmission speed of the diaphragm substrate, so that the absorbed dose accepted by the diaphragm substrate is 15kGy; the diaphragm substrate after the radiation is packed into the grafting reactor, sealed, vacuumized, and then The grafting liquid (the grafting liquid in the described step ② is measured by mass percentage, includes the following components: 1.0% of alkyl alcohol polyoxyethylene ether, 2.5% of a...

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Abstract

The invention belongs to a composite membrane for a secondary nickel-zinc cell. The composite membrane is in a two-layer composite structure; one layer is a polypropylene microporous membrane; the other layer is nonwoven fabric containing an ultrafine polyolefin fiber; the surface density of the composite membrane is 38g / m<2> to 80g / m<2>; and the thickness is 0.1-0.2mm. According to the composite membrane for the secondary nickel-zinc cell, the battery assembly process becomes simple and feasible; malposition and creases between two layers are avoided; base cloth of the membrane does not easily generate the crease in the radiation grafting process; keeping of the smooth membrane is facilitated; internal surface carboxyl and external surface carboxyl of the composite membrane and (or) sulfonyle hydrophilic functional groups are provided by radiation grafting of acrylic acid and (or) sodium p-styrenesulfonate; and the composite membrane has permanent hydrophilicity.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and in particular relates to a composite separator for a secondary nickel-zinc battery and a preparation method thereof. Background technique [0002] Nickel-zinc battery is a kind of battery that has been paid attention to for a long time. Its advantages lie in high voltage (theoretical voltage is 1.8V, working voltage is 1.6V) and low cost. Its disadvantage comes from the fact that the zinc electrode is prone to produce zinc oxide dendrites to penetrate the separator and cause a short circuit of the battery, which affects the cycle life of the battery. Therefore, nickel-zinc batteries have not been well developed so far. In order to solve the problem of zinc oxide dendrites in nickel-zinc batteries, one of the main methods used by people is to improve the anti-dendrite ability of the separator. One of the effective methods commonly used is to use polypropylene microporous membranes ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/30H01M50/403H01M50/417H01M50/489
CPCH01M10/30H01M50/409Y02E60/10
Inventor 崔国士党从军赵红英崔攀
Owner HENAN KEGAO RADIATION CHEM TECH
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