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Cadmium negative pole, preparation method thereof and secondary nickel-cadmium battery containing same

A nickel-cadmium battery and negative electrode technology, which is applied to nickel batteries, battery electrodes, alkaline batteries, etc., can solve the problems of easy enhancement of electrode polarization, poor battery discharge performance, hindering the movement of electrons and ions, etc., so as to improve the initial capacity. , The consistency of the battery is improved, and the effect of small current charging is guaranteed.

Inactive Publication Date: 2009-12-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor conductivity of copper hydroxide, it is easy to enhance the polarization of the electrode during charging and hinder the movement of electrons and ions. Therefore, the discharge performance of the battery is poor.
In addition, although the addition of copper hydroxide can inhibit the growth of dendrites to a certain extent, it still cannot dissolve the dendrites of cadmium. Therefore, the effect of inhibiting the growth of dendrites of cadmium negative electrodes is still not ideal.

Method used

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  • Cadmium negative pole, preparation method thereof and secondary nickel-cadmium battery containing same

Examples

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preparation example Construction

[0024] In the preparation method of the cadmium negative electrode according to the present invention, the raw materials used are as defined above for the cadmium negative electrode in the present invention, and will not be described in detail here.

[0025] The amounts of solvent, negative electrode active material and negative electrode binder in the slurry are known to those skilled in the art. Generally speaking, based on the weight of the negative active material, the content of the solvent may be 15-60% by weight, preferably 15-50% by weight. The solvent may be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) and water and alcohol One or several types; the amount of the solvent can make the paste have viscosity and fluidity, and can be coated on the conductive substrate. Wherein, the methods and conditions of drying and calendering are well known to those skilled in the art.

[002...

Embodiment 1

[0036] This embodiment is used to illustrate the secondary nickel-cadmium battery provided by the present invention

[0037] (1) Preparation of negative electrode

[0038] With 75 kilograms of negative electrode active material cadmium oxide, 5 kilograms of sponge cadmium (Hebei Dacheng Company) and 10 kilograms concentration are the aqueous solution of 3% by weight of hydroxypropyl methylcellulose and 4 kilograms of water, fully stir, then add 1.2 kilograms of solid The polytetrafluoroethylene suspension with a content of 60% by weight, 1.6 kg of an aqueous solution of styrene-butadiene rubber with a concentration of 60% by weight and 1.8 kg of a PVA solution with a concentration of 4% by weight were mixed and stirred evenly, and finally 0.5 kg of conductive metal oxide was added LiMn 2 o 4 , mixed and stirred to form a uniform negative electrode slurry.

[0039] The slurry is evenly coated on a nickel-plated perforated steel strip with a width of 220 mm and a thickness of...

Embodiment 2

[0045] This embodiment is used to illustrate the secondary nickel-cadmium battery provided by the present invention

[0046] (1) Preparation of negative electrode

[0047] With 75 kilograms of negative electrode active material cadmium oxide, 5 kilograms of sponge cadmium (Hebei Dacheng Company) and 0.5 kilogram of graphite, 16 kilograms of concentration are the aqueous solution and 3 kilograms of water of the hydroxypropyl methylcellulose of 3 weight %, fully stir, then Add 1 kg of polytetrafluoroethylene suspension with a solid content of 60% by weight, 1.5 kg of styrene-butadiene rubber aqueous solution with a concentration of 60% by weight, and 1 kg of PVA with a concentration of 10% by weight, mix and stir evenly, and finally add 1.8 kg of conductive metal oxide LiMn 2 o 4 , mixed and stirred to form a uniform negative electrode slurry.

[0048] The slurry is evenly coated on a nickel-plated perforated steel strip with a width of 220 mm and a thickness of 80 microns, t...

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Abstract

The invention relates to a cadmium negative pole used for a secondary nickel-cadmium battery. The cadmium negative pole comprises a current collector and a negative pole material covered on the current collector, and the negative pole material contains a negative pole active substance and negative pole adhesive, wherein the negative pole material also contains a conductive metallic oxide which contains at least two metallic elements. The growth of cadmium dendritic crystals of a battery prepared by adopting the cadmium negative pole is effectively restrained in a charging process, thereby better meeting the requirements on the low-current charge and the high-current discharge of the battery.

Description

technical field [0001] The invention relates to a negative electrode and a preparation method thereof, and a battery using the negative electrode, in particular to a cadmium negative electrode, a preparation method thereof, and a secondary nickel-cadmium battery using the cadmium negative electrode. Background technique [0002] Since the nickel battery was invented in 1901, it has developed rapidly. In the ten years from 1976 to 1986, the sales of nickel-cadmium batteries in the world increased by three times, that is, from less than 500 million US dollars to 1.5 billion US dollars. . In recent years, the nickel-cadmium battery market has developed into one of the most important components of the secondary battery market. [0003] Compared with other batteries, nickel-cadmium batteries have great advantages in overcharge resistance, high current discharge, fast charging, safety and low cost. However, its slow charging performance (low current, long-term continuous charging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/24H01M4/62H01M4/36H01M4/26H01M10/30
CPCY02E60/124Y02E60/10
Inventor 周文会张学全刘建军辜敏
Owner BYD CO LTD
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