Preparation method for lithium ion battery pole piece

A technology for lithium-ion batteries and pole pieces, which is applied in the field of preparation of lithium-ion battery pole pieces, can solve the problems of low efficiency and low consistency in the adhesive tape process, improve uniformity and consistency, reduce workload, and improve production efficiency effect

Inactive Publication Date: 2009-05-27
海宁市盐官工业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the defects of low efficiency and low consistency of the adhesive tape process in the existing preparation method of lithium-ion battery pole pieces, and provides a A preparation method for a lithium-ion battery pole piece, in the method, not only the efficiency of pasting tape is improved, but also the uniformity and consistency of the pasted tape are also improved

Method used

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  • Preparation method for lithium ion battery pole piece
  • Preparation method for lithium ion battery pole piece
  • Preparation method for lithium ion battery pole piece

Examples

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Effect test

preparation example Construction

[0015] figure 1 The flow chart of the preparation method of the lithium battery pole piece provided by the present invention, such as Figure 1-3 As shown, the method for preparing lithium ion battery pole pieces provided by the present invention includes: coating a slurry containing a positive electrode material or a negative electrode material on a current collector; drying and rolling the current collector coated with the slurry, Thus the large pole piece 1 is produced; wherein the method further includes applying tape 2 on the transition area where the dressing area and the non-dressing area of ​​at least one end of the large pole piece 1 after calendering; along the length of the tape 2 The large pole piece 1 is cut in the direction perpendicular to the direction, so that the pole piece 3 is obtained.

[0016] Since both ends of the pole piece 3 are prone to burrs and material loss after being pressed, it is preferable that the dressing area and the non-dressing area at bot...

Embodiment

[0025] This embodiment is used to manufacture a lithium ion battery using the positive electrode sheet and the negative electrode sheet prepared by the preparation method provided by the present invention.

[0026] 100 parts by weight of LiFePO 4 , 2 parts by weight of vinylidene fluoride polymer containing carboxyl group (from the copolymerization of methacrylic acid monomer and vinylidene fluoride monomer in a weight ratio of 1:30, the number average molecular weight is 8×10 5 -1×10 6 ), 1 part by weight polyacrylonitrile (number average molecular weight is 5×10 4 ~1×10 5 ) And 4 parts by weight of acetylene black are added to 60 parts by weight of NMP, and stirred to obtain positive electrode slurry.

[0027] Coat the positive electrode slurry evenly on the aluminum foil, then dry it at 150°C and roll it. After rolling, the dressing area and the non- dressing area on both sides of the large pole piece are both Paste the tape, the width of the tape in the dressing area and the u...

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Abstract

The invention provides a method for preparing lithium-ion battery pole pieces. The method comprise the steps of coating an electricity gathering body with sizing agent containing anode material or cathode material, drying and calendering the electricity gathering body coated with the sizing agent, so as to prepare a big pole piece (1), wherein the method also comprises the steps of sticking adhesive tape (2) on a transitional region connected with a dressing area a non-dressing area on at least one end of the calendered big pole piece (1) and cutting the big pole piece (1) along the direction perpendicular to the length direction of the adhesive tape (2), so as to prepare a pole piece (3). When the method is used to manufacture the lithium-ion battery pole pieces, the aim of sticking the adhesive tape on every cut pole piece can be achieved by sticking the adhesive tape only once, thereby reducing the workload of sticking the adhesive tape and improving production efficiency. In addition, the method has the advantage of improving the uniformity and consistency of the adhesive tape on the prepared pole pieces.

Description

Technical field [0001] The invention relates to a method for preparing a pole piece of a battery, and more specifically to a method for preparing a pole piece of a lithium ion battery. Background technique [0002] Lithium-ion batteries mainly include a pole core and a non-aqueous electrolyte. The pole core includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet. The battery positive electrode sheet and the negative electrode sheet (hereinafter collectively referred to as the pole sheet) The preparation method includes: loading the slurry containing the positive electrode material or the negative electrode material on the current collector; drying the current collector coated with the slurry; compressing the dried current collector; and pressing the sheet The processed pole piece is cut according to the model required by the prepared battery. [0003] When the pole piece is loaded with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04
CPCY02E60/12Y02E60/10
Inventor 李志兵朱小明武汉辉姚保同
Owner 海宁市盐官工业投资有限公司
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