Electrode plate and preparation method thereof and battery

A technology of electrode sheets and electrode materials, applied in the direction of non-aqueous electrolyte batteries, battery electrodes, lithium batteries, etc., can solve the problem of low charge retention rate, achieve high charge retention rate, good safety, reduce burrs and drop powder effect

Inactive Publication Date: 2020-04-24
SHENZHEN BETTERPOWER BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, no matter whether the electrode sheet prepared by the dry method is used as the electrode sheet or the electrode sheet prepared by the wet method is used as the electrode sheet, the charge retention rate is low.

Method used

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  • Electrode plate and preparation method thereof and battery
  • Electrode plate and preparation method thereof and battery
  • Electrode plate and preparation method thereof and battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] The preparation method of the above-mentioned electrode sheet comprises the following steps:

[0044] A protective film is prepared on the current collector and / or the electrode material by using the solution containing the binder or the emulsion containing the binder to obtain an electrode sheet.

[0045]In one of the embodiments, the steps of the preparation method of the above-mentioned electrode sheets include: using a solution containing a binder or an emulsion containing a binder to prepare a protective film on the current collector to obtain a current collector with a protective film; The material is coated, filled or rolled onto a current collector with a protective film to obtain an electrode sheet. That is, the steps of the above-mentioned method for preparing the electrode sheet include step S110 to step S120.

[0046] Step S110 , using a solution containing a binder or an emulsion containing a binder to prepare a protective film on the current collector to ...

Embodiment 1

[0070] In Example 1, a total of 5 electrode sheets were prepared, numbered A1 to A5 in sequence, and the preparation method of each electrode sheet is as follows:

[0071] (1) Filling the electrode material into the current collector with permeable pores to obtain a composite body. Wherein, the electrode material is composed of nickelous hydroxide, cobaltous oxide and diytterbium trioxide, and the mass ratio of nickelous hydroxide, cobaltous oxide and diytterbium trioxide is 72.5:5.5:2. Then it is baked and rolled to form an electrode sheet.

[0072] (2) The electrode sheet obtained in step (1) was used as a positive electrode, and a nickel-metal hydride battery was assembled with a separator paper and a negative electrode, and the performance of the battery was measured according to the test method of the charge retention rate, and the results are shown in Table 1. Among them, the specific steps of the test method of charge retention include:

[0073] 1) Discharge the batte...

Embodiment 2

[0080] The structure of the electrode sheet of embodiment 2 is as figure 1 shown. A total of 5 electrode sheets were prepared, numbered B1 to B5 in sequence. The preparation method of each electrode sheet is as follows:

[0081] (1) Dissolve 3g of carboxymethylcellulose (CMC) dry powder in 97mL of pure water, stir at 45°C for 6h, and then cool at room temperature for 36 hours to discharge the air dissolved during the dissolution process to obtain carboxymethylcellulose Solution (hereinafter referred to as CMC solution);

[0082] (2) Pass the CMC solution through the dry compressed air of 4MPa to atomize the CMC solution, and then pass the current collector with permeable holes at a uniform speed through the atomization zone formed by the atomization of the CMC solution, so that the surface of the current collector forms a layer containing CMC membrane. Wherein, the thickness of the interlayer is 0.02mm.

[0083] (3) Filling the electrode material into the current collector...

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Abstract

The invention relates to an electrode plate and a preparation method thereof and a battery. The electrode plate comprises a current collector with seepage holes, an electrode material and a protectivefilm, wherein the seepage holes are filled with the electrode material. The protective film comprises at least one of a top film and an interlayer film, the interlayer film is arranged on the hole walls of the seepage holes and bonded with the electrode material and the hole walls, and the top film is bonded with the surface of the current collector. According to the electrode plate, the protective film containing an adhesive is arranged, so that burrs and powder falling caused by bending of the electrode plate during winding are reduced, and the charge retention rate is higher and the safetyis better when the electrode plate is applied to a battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrode sheet, a preparation method thereof and a battery. Background technique [0002] The electrode sheet of a rechargeable secondary chemical battery (such as a lithium battery) that can be recycled mainly includes a current collector that is electrically conductive for the battery and an electrode material that is provided on the current collector in the form of filling or adhesion. [0003] The preparation of electrode sheets is mainly divided into dry method and wet method. When preparing electrode sheets by wet method, the electrode material, conductive agent, binder, solvent, etc. are generally mixed uniformly to obtain electrode slurry, which is then coated and dried to obtain electrode sheets. The process of preparing electrode sheet by dry method is generally to first mix conductive agent, binder and electrode material to form a diaphragm, and then compound th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M10/052
CPCH01M4/131H01M4/1391H01M10/052Y02E60/10
Inventor 叶凯张国民龙翔宾建军赵顺昌张菊花王军熊建云赵小军
Owner SHENZHEN BETTERPOWER BATTERY
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