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Method for reducing contact resistance of electrode

An electrode contact and resistance technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of voltage characteristics and capacity decline, accelerated alkaline battery failure, reaction impedance Rt increase, etc., to reduce resistance and excellent chemical stability. , the effect of reducing contact resistance

Active Publication Date: 2014-06-04
LIAONING JIUYI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally believed that the failure of alkaline batteries is divided into two steps. First, the electrolyte in the diaphragm dries up and the resistance Rs of the solution increases, thereby reducing the performance of the battery. This early decline change can be recovered by re-injecting alkali; second, the electrode surface Deactivation increases the reaction impedance Rt, which causes a decrease in voltage characteristics and capacity. This decay change is irreversible, which in turn accelerates the failure of alkaline batteries

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1 Preparation of fluorinated styrene-butadiene latex FSBR-1

[0017] Add 800g of deionized water, 3g of dodecyl mercaptan, 35g of potassium oleate, 8g of potassium chloride, 25g of divinylbenzene, and 2g of potassium persulfate in sequence in the high-pressure polymerization kettle, replace with nitrogen 3 times, and stir for 30 minutes Then heat up to 60 degrees. 150 g of styrene was slowly dropped into the polymerization kettle, and at the same time, 850 g of butadiene and 38 g of tetrafluoroethylene gas were introduced to start the reaction. The solid content was measured regularly (see GB2958-82 for solid content determination), and the reaction was terminated when the monomer conversion rate was greater than 99%, to obtain fluorinated styrene-butadiene latex FSBR-1.

[0018] The fluorinated styrene-butadiene latex FSBR-1 was decomposed by a quartz oxygen bottle, and the fluorine content in the copolymer was determined to be 2.3% by titration of lanthanum...

Embodiment 2

[0019] Example 2 Preparation of fluorinated styrene-butadiene latex FSBR-2

[0020] Add 800g of deionized water, 3g of dodecyl mercaptan, 35g of potassium oleate, 8g of potassium chloride, 25g of divinylbenzene, and 2g of potassium persulfate in sequence in the high-pressure polymerization kettle, replace with nitrogen 3 times, and stir for 30 minutes Then heat up to 70 degrees. 150 g of styrene was slowly dropped into the polymerization kettle, and 850 g of butadiene and 187 g of tetrafluoroethylene gas were introduced simultaneously to start the reaction. Determine the solid content regularly (see GB2958-82 for the determination of solid content), and terminate the reaction when the monomer conversion rate is greater than 99%, to obtain fluorinated styrene-butadiene latex FSBR-2.

[0021] The fluorinated styrene-butadiene latex FSBR-2 was decomposed in a quartz oxygen bottle, and the fluorine content in the copolymer was determined to be 11.2% by titration of lanthanum ni...

Embodiment 3

[0022] Example 3 A method for reducing electrode contact resistance

[0023] Using fluorinated styrene-butadiene latex as the negative electrode binder to prepare the negative plate, the specific method is as follows:

[0024] (1) Preparation of negative plate

[0025] Take 1000g of hydrogen storage alloy powder, 3 g of sodium carboxymethylcellulose (CMC), 3 g of conductive carbon black (C), 15 g of binder (FSBR-1 or FSBR-2 or SBR), and then add deionized water 180 g, stirred for 3 h, mixed evenly to make a slurry, evenly coated on a nickel-plated steel strip with a thickness of 0.06mm, after drying, it was rolled and rolled, and the cut size was 76.5mm×36mm×0.24mm. Make a negative plate.

[0026] (2) Electrochemical impedance performance comparison

[0027] Experimental method: the test adopts a three-electrode system, and the working electrode is the negative electrode plate prepared above, with an area of ​​10mm×10mm×0.24mm. The reference electrode is a Hg / HgO electro...

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Abstract

The invention discloses a method for reducing contact resistance of an electrode. The technical scheme is as follows: the negative plate of a battery is prepared by adopting fluorinated styrene butadiene latex as an adhesive, wherein a method for preparing the fluorinated styrene butadiene latex comprises the following steps of: orderly adding de-ionized water, lauryl mercaptan, potassium oleate, potassium chloride, divinyl benzene and potassium peroxydisulfate to a polymeric kettle; performing replacement by using nitrogen; increasing the temperature to 60-70 DEG C after stirring for 30 minutes, dropwise adding styrene to the polymeric kettle and simultaneously introducing butadiene and tetrafluoroethylene gases, and stirring for reaction. The method adopts the fluorinated styrene butadiene latex as the negative adhesive so that the contact resistance of the electrode is reduced, and simultaneously, the internal pressure of the battery is reduced and the cycle life of the battery is prolonged; as a result, the battery is high in overcharge resistance, high in discharge platform and good in capacity recovery.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a method for reducing the microscopic contact resistance of electrodes of alkaline storage batteries. Background technique [0002] The internal resistance and cycle life of batteries are important indicators for evaluating alkaline batteries, which have always been important factors restricting their development. It is generally believed that the failure of alkaline batteries is divided into two steps. First, the electrolyte in the diaphragm dries up and the resistance Rs of the solution increases, thereby reducing the performance of the battery. This early decline change can be recovered by re-injecting alkali; second, the electrode surface Deactivation increases the reaction impedance Rt, thereby causing a decrease in voltage characteristics and capacity. This decay change is irreversible, which in turn accelerates the failure of the alkaline battery. Therefore, the main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCY02E60/12Y02E60/10
Inventor 庞柳萍易晓芳张春玲胡琼洁
Owner LIAONING JIUYI ENERGY TECH