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Negative electrode of nickel-cadmium battery, preparation method thereof, and battery containing the same

A nickel-cadmium battery and negative electrode technology, applied in the field of nickel-cadmium battery negative electrode and its preparation and batteries containing the negative electrode, can solve the problems of reducing self-discharge rate and high self-discharge rate of nickel-cadmium battery, so as to reduce self-discharge rate and prevent Micro-short circuit phenomenon, effect of inhibiting dissolution

Inactive Publication Date: 2011-12-14
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem of high self-discharge rate of nickel-cadmium batteries with a nickel layer on the negative electrode in the prior art, and provide a nickel-cadmium battery negative electrode capable of reducing the self-discharge rate and a battery containing the negative electrode

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0022] The present invention also provides a method for preparing a negative electrode of a nickel-cadmium battery. The method includes attaching a negative electrode material layer on the negative electrode current collector and attaching a nickel layer on the negative electrode material layer. An electron-permeable membrane is attached, and the electron-permeable membrane is an organic membrane.

[0023] The electron-permeable film can be any high molecular polymer that can form a viscous solution after being dissolved in water, and can form an electron-permeable film after being coated on the surface of the pole piece and dried, for example, it can be polyvinyl alcohol (PVA), One or more of carboxymethylcellulose (CMC), hydroxypropylmethylcellulose (HPMC) and polyethylene glycol (PEG).

[0024] Preferably, the water-soluble polymer is two or more of polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl methyl cellulose, polyethylene glycol and polytetrafluoroethylene; a...

Embodiment 1

[0042] This example is used to illustrate the preparation of the nickel-cadmium battery negative electrode of the present invention.

[0043] 1. Preparation of negative electrode slurry

[0044] 80 parts by weight of negative electrode active material cadmium oxide, 0.1 parts by weight of conductive agent carbon black and 7 parts by weight of additive nickel powder, 0.45 parts by weight of fiber, 2.6 parts by weight of binder polyvinyl alcohol (PVA) aqueous solution (mass fraction 10%), 10 parts by weight of CMC solution (2.5% by mass) and 7 parts by weight of water were mixed and stirred evenly to obtain negative electrode slurry.

[0045] 2. Preparation of negative electrode

[0046] The negative electrode slurry is evenly coated on a punched nickel-plated steel strip with a thickness of 100 microns, then dried at 90°C, rolled, and cut to obtain a negative electrode sheet with a size of 240×33.6 mm, which contains 8.5 grams of active substance cadmium oxide.

[0047] 3. N...

Embodiment 2

[0052] This example is used to illustrate the preparation of the nickel-cadmium battery negative electrode of the present invention.

[0053] Prepare the negative electrode in the same manner as in Example 1, except that step 4 is: place the negative electrode sheet prepared in step 3 in an aqueous solution containing 3% by weight of CMC, take it out after soaking for 5 seconds, and dry it at 100°C. The prepared nickel-cadmium battery negative electrode is denoted as A2, and the thickness of its electron-permeable film is 1.2 microns.

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PUM

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Abstract

The invention relates to a nickel-cadmium cell cathode and a manufacturing method thereof. The cathode comprises a cathode flow-collecting body, a cathode material layer and a nickel layer, wherein the cathode material layer is attached to the cathode flow-collecting body, the nickel layer is attached to the cathode material layer, and an electronic perviousness film as an organic film is also attached to the surface of the nickel layer. The invention also provides a nickel-cadmium secondary cell; in the nickel-cadmium cell cathode, the electronic perviousness film is attached to the surface of the nickel layer, can restrain the dissolution of cadmium and nickel and prevent the internal micro short circuit phenomenon of the cell manufactured by the cathode, thereby the self-discharge rate of the manufactured cell is reduced.

Description

technical field [0001] The invention relates to a negative pole of a nickel-cadmium battery, a preparation method thereof and a battery containing the negative pole. Background technique [0002] Nickel-cadmium batteries have the advantages of large capacity, long life, simple manufacture and low cost, and the number of cycles can reach hundreds or even thousands of times. With the development of the national economy, nickel-cadmium batteries have been widely used in power supply systems for national defense, fire protection, aerospace, household appliances, office machines, communication equipment, and electric tools. [0003] A nickel-cadmium battery generally includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The positive electrode is usually nickel foam, and the negative electrode includes a negative electrode conductive matrix and a negative electrode material coated on the negative electrode c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/24H01M4/32H01M4/26H01M10/24H01M10/30
CPCY02E60/124Y02E60/10
Inventor 余安明罗永良肖瑞娟
Owner BYD CO LTD