Manufacturing method of nickel-cadmium battery cadmium negative electrode

A nickel-cadmium battery and a manufacturing method technology, which are applied to battery electrodes, alkaline battery electrodes, electrode carriers/current collectors, etc., can solve the problems of waste of negative electrode active materials, serious self-discharge, mismatched structure of positive electrode and pole pieces, etc. The effect of prolonging cycle life and storage life, suppressing self-discharge and memory effect phenomenon, and improving high-current charge and discharge effect

Inactive Publication Date: 2015-04-22
广州云通锂电池股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are significant deficiencies in the nickel-cadmium battery manufactured by the negative pole piece of this structure:
[0003] First, due to the use of common cadmium oxide negative electrode active materials or cadmium oxide and cadmium hydroxide mixture negative electrode active materials, the manufactured negative electrode pole piece is very thin, easy to break, and does not match the structure of the relatively thick positive pole piece. Affect the capacity of the battery, affect the normal operation of the battery, reduce the service life of the battery, and may even cause safety accidents such as explosion due to short circuit
[0004] Second, the specific capacity of the nickel-cadmium battery negative electrode sheet produced by the prior art is relatively large and greatly exceeds the specific capacity of the positive electrode sheet. Therefore, in the case of mismatched external dimensions, especially the thickness, the negative active material is seriously wasted, which invisibly improves Reduce the manufacturing cost of the battery, resulting in material waste
[0005] Third, since the active material of the negative electrode is transformed into metal cadmium in the charging state, in the process of repeated charging and discharging, the metal cadmium is easy to form dendrites during the formation of cadmium crystals during charging, which is easy to pierce the battery separator and form a battery short circuit, thereby Make the battery useless and scrapped
[0006] Fourth, the cadmium negative electrode also has a relatively serious "memory effect", and the self-discharge is also very serious, which seriously affects the capacity and cycle life of the nickel-cadmium battery
[0007] Fifth, in the case of severe dendrite formation in the negative electrode of the nickel-cadmium battery, the battery may also explode due to an internal short circuit, which poses a certain safety hazard

Method used

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  • Manufacturing method of nickel-cadmium battery cadmium negative electrode
  • Manufacturing method of nickel-cadmium battery cadmium negative electrode
  • Manufacturing method of nickel-cadmium battery cadmium negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the first step, the negative electrode active material coating 1 is an active material mixture composed of ultrafine cadmium oxide (CdO), nano-graphite and carbon nanotubes mixed in a mass ratio of 7.5:0.5:2;

[0036] And a mixed binder of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) mixed in an equal mass ratio of 2% of the mass of the active material mixture, as a negative electrode mixed binder (polytetrafluoroethylene is polytetrafluoroethylene Polytetrafluoroethylene emulsion with a solid content of 60% vinyl fluoride, polyvinylidene fluoride is a polyvinylidene fluoride emulsion with a solid content of 60% polyvinylidene fluoride);

[0037] And sodium carboxymethylcellulose (CMC) accounting for 1% by mass of the active substance mixture as a negative electrode thickener;

[0038] And the distilled water that accounts for the mass ratio of active substance mixture 25%;

[0039] mixing the active material mixture, negative electrode mixing b...

Embodiment 2

[0043]In the first step, the negative electrode active material coating 1 is an active material mixture composed of superfine cadmium oxide (CdO), nano-graphite and carbon nanotubes mixed in a mass ratio of 7.5:0.6:3 in sequence;

[0044] And a mixed binder of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) mixed in an equal mass ratio of 3% of the mass of the active material mixture, as a negative electrode mixed binder (polytetrafluoroethylene is polytetrafluoroethylene Polytetrafluoroethylene emulsion with a solid content of 60% vinyl fluoride, polyvinylidene fluoride is a polyvinylidene fluoride emulsion with a solid content of 60% polyvinylidene fluoride);

[0045] And sodium carboxymethylcellulose (CMC) accounting for 1.5% by mass of the active substance mixture as a negative electrode thickener;

[0046] And the distilled water that accounts for 30% of the mass ratio of active substance mixture;

[0047] mixing the active material mixture, negative el...

Embodiment 3

[0051] In the first step, the negative electrode active material coating 1 is an active material mixture composed of ultrafine cadmium oxide (CdO), nano-graphite and carbon nanotubes mixed in a mass ratio of 7.5:0.7:4 in sequence;

[0052] And a mixed binder of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) mixed in an equal mass ratio of 3.5% of the mass of the active material mixture, as a negative electrode mixed binder (polytetrafluoroethylene is polytetrafluoroethylene Polytetrafluoroethylene emulsion with a solid content of 60% vinyl fluoride, polyvinylidene fluoride is a polyvinylidene fluoride emulsion with a solid content of 60% polyvinylidene fluoride);

[0053] And sodium carboxymethylcellulose (CMC) accounting for 1.8% by mass of the active substance mixture as a negative electrode thickener;

[0054] And the distilled water that accounts for 40% of the mass ratio of active substance mixture;

[0055] mixing the active material mixture, negative...

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Abstract

The invention discloses a manufacturing method of a nickel-cadmium battery cadmium negative electrode piece. The method comprises: A. mixing superfine cadmium oxide, a nano-graphite conductive agent and a carbon nanotube according to a mass ratio of 7.5:0.5-1:2-6 so as to obtain an active substance mixture, selecting a negative mixed binder accounting for 2-6% of the mass of the active substance mixture, selecting a negative thickener accounting for 1-2% of the mass of the active substance mixture, selecting distilled water accounting for 25-45% of the mass of the active substance mixture, and mixing the materials uniformly to obtain a mixed slurry; B. coating a negative current collector with the slurry, then carrying out drying and cutting, and welding a negative pole ear. With changing the existing nickel-cadmium battery basic production processes and production equipment, the method provided in the invention can produce nickel-cadmium batteries with stable performance, high circulating capacity, long service and storage life, good large current discharge effect, and high safety performance.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a method for manufacturing a cadmium negative electrode of a nickel-cadmium battery. The cadmium negative electrode of nickel-cadmium battery produced by this technology can be used to manufacture various types of nickel-cadmium batteries, especially suitable for manufacturing high-current nickel-cadmium power batteries used in multi-battery combination battery packs for various occasions. Background technique [0002] At present, the negative electrode sheet used in the nickel-cadmium battery manufactured by the existing battery industry is mainly composed of three parts: negative electrode active material coating, nickel-plated stainless steel mesh negative electrode current collector, and nickel strip negative electrode tab. The negative electrode active material is generally composed of cadmium oxide, cadmium hydroxide, nickel powder and a binder. There are si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/26H01M4/80H01M4/62
CPCY02E60/124Y02E60/10
Inventor 詹炳然罗社科詹金俊杨为王建红
Owner 广州云通锂电池股份有限公司
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