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Iron negative electrode binder of iron-nickel secondary battery

A secondary battery and iron negative electrode technology, which is applied in the field of alkaline secondary batteries, can solve the problems of increased battery manufacturing cost, small adhesive force, complicated manufacturing process, etc., achieve good weather resistance and widen the use temperature range.

Inactive Publication Date: 2018-11-16
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode binder can also use polytetrafluoroethylene (PTFE) as the binder, but PTFE itself has no solvent and has a small adhesive force. Therefore, the prepared electrode needs to be molded under high pressure or sintered at high temperature, resulting in a Complicated, which increases the manufacturing cost of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method of the binder iron negative electrode of the present invention is to mix the iron negative electrode material (containing 10-25% conductive agent) and the resin solution according to the content of 30%-60% and 40%-70% respectively. The slurry is coated on the conductive current collector substrate by spraying, brushing or scraping, and then dried and pressurized to form the iron negative electrode.

[0024] Preferably, the contents of the iron negative electrode material and the resin solution are 40%-50% and 50%-70%, respectively.

[0025] The above-mentioned iron negative electrode material can be a mixture of one or more of Fe2O3, Fe3O4 or iron powder; the above-mentioned conductive agent can be one or more of carbon materials such as graphite, acetylene black, carbon nanotubes, graphene, etc. The above-mentioned conductive current collector substrate material can be nickel foam, perforated nickel strip, perforated nickel-plated stainless steel...

Embodiment 1

[0028] Mix 3 g of high-molecular-weight high-chlorinated polyethylene, 1.5 g of hydroxypropyl cellulose and 95.5 g of xylene in a conical flask container, seal it, place it in a full-temperature oscillator, heat it to 50 ° C, and shake it for 5 hours to obtain Clear solution, save for future use. After mixing 1 gram of Fe2O3 and 0.10 gram of graphite powder evenly, take 1 gram of the above-mentioned solution prepared in this example and mix it with it, fully stir, defoam, and then apply 2cm×5cm, the thickness is 2.2mm, and the number of openings is On top of 100PPI foamed nickel, dry it and roll it to a thickness of 0.4mm. Test method: Take an industrialized sintered nickel electrode of the same size and a thickness of 1mm as the working electrode, and a 0.2mm hydrophilic polypropylene felt as the diaphragm to form a single cell for evaluation. The electrolytes are 6M KOH and 0.1M Li(OH) aqueous solutions, and the test temperatures are 20°C and 70°C. The charging and dischar...

Embodiment 2

[0031] Mix 3g of high-chlorinated polyethylene with medium molecular weight, 2g of hydroxypropyl cellulose and 95g of xylene in a conical flask container, seal it, place it in a full-temperature shaker, heat it to 50°C, shake it for 5h, and obtain a transparent solution, save for later use. After mixing 1 gram of Fe3O4 and 0.15 gram of graphite powder evenly, take 1 gram of the above-mentioned solution prepared in this example and mix it with it, stir thoroughly, defoam, and then coat 2cm×7.5cm with a thickness of 1.8mm and the number of openings On top of 120PPI foamed nickel, dry it and roll it to a thickness of 0.3mm. Test method and charging and discharging system are identical with embodiment 1, and the test result of the capacity of first 6 six cycles is as follows:

[0032] Cycles

[0033] Effects of the invention: From the implementations 1 and 2, it can be seen that the iron negative electrode prepared by using the binder of the present invention has a rela...

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PUM

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Abstract

The invention provides a negative electrode binder of an iron-nickel battery, and a preparation method of an iron negative electrode adopting the binder. The binder comprises 30%-80% of hydrophobic high chlorinated polyethylene which is insoluble in water, chlorinated polyvinyl chloride and other high-molecular resin and 20%-70% of hydrophilic hydroxypropyl cellulose, hydroxyethyl cellulose and other cellulose derivative high-molecular resin which are mixed and dissolved in aromatic hydrocarbon to prepare a solution with the concentration of 1%-10%. 30%-60% of an iron negative electrode material and 40%-70% of the above solution are prepared into slurry. A conductive current collecting substrate is coated with the slurry, and drying and rolling are carried out to form the iron negative electrode. The iron negative electrode prepared by the binder disclosed by the invention is insoluble in water, and has the characteristics of being high in adhesion performance, and excellent in alkaliresistance and ageing resistance, does not peel off at normal temperature and high temperature, and does not fall off, so that the performance of the battery is improved, the service life of the battery is prolonged, and the use temperature range of the battery is widened.

Description

technical field [0001] The invention belongs to the technical field of alkaline secondary batteries, and in particular relates to an iron negative electrode binder for an iron-nickel secondary battery and a preparation method for an iron negative electrode using the binder. The iron negative electrode prepared by using the binder of the invention has the advantages of large specific capacity, long cycle life and good high temperature resistance, and can be used in energy storage and power iron-nickel secondary batteries. Background technique [0002] The iron-nickel battery is a secondary battery composed of a positive electrode of nickel hydroxide, a negative electrode of iron or its oxide, and a strong alkaline aqueous electrolyte such as sodium hydroxide or potassium hydroxide. Iron-nickel batteries do not contain toxic heavy metal elements such as lead, cadmium, and mercury, and are green and environmentally friendly alkaline secondary batteries. Compared with lead-acid...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/30
CPCH01M4/621H01M10/30Y02E60/10
Inventor 杨少华陈曦刘达刘晟林许浩
Owner SHENYANG LIGONG UNIV