Battery pole piece and manufacturing method of lithium ion secordary battery containing the pole piece

A pole piece and frequency technology, which is applied in the field of lithium-ion secondary battery preparation, can solve problems such as unstable product quality, good or bad battery cycle performance, and uneven capacity distribution.

Active Publication Date: 2009-01-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process, it was found that the battery made of the pole piece prepared by the traditional pole piece calendering process has uneve

Method used

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  • Battery pole piece and manufacturing method of lithium ion secordary battery containing the pole piece

Examples

Experimental program
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preparation example Construction

[0020] The preparation method of the lithium-ion battery provided by the present invention comprises preparing the positive pole and the negative pole of the battery, and preparing the positive pole, the negative pole and the separator into a pole core, sealing the obtained pole core and electrolyte in the battery case, and the positive pole and the negative pole The preparation method comprises coating and / or filling the slurry containing the positive electrode active material, the conductive agent, the positive electrode binder and the solvent on the current collector, and the slurry containing the negative electrode active material, the negative electrode binder and the solvent Coating and / or filling on the current collector, drying, and rolling the dried current collector containing the positive electrode active material, conductive agent and positive electrode binder and the current collector containing the negative electrode active material and negative electrode binder ,...

Embodiment 1

[0040] This example is used to illustrate the preparation method of the lithium ion secondary battery provided by the present invention.

[0041] (1) Preparation of positive electrode

[0042] 100 g of the positive active ingredient LiCoO 2 , 5 grams of binder polyvinylidene fluoride, 5 grams of conductive agent acetylene black were added to 50 grams of N-methylpyrrolidone, and then stirred in a mixer to form a uniform positive electrode slurry.

[0043] The slurry was evenly coated on both sides on an aluminum foil with a thickness of 20 microns, dried at 150° C., and cut to obtain a positive electrode sheet with a size of 355×41.5×0.205 mm. Rolling is then carried out, Δd1 / Δd=10% after the first rolling, and Δd2 / Δd=90% after the second rolling; a positive electrode sheet with a thickness of 0.145 mm is obtained. It contains 5.9 grams of active ingredient LiCoO 2 .

[0044] (2) Preparation of negative electrode

[0045] Add 100 grams of natural graphite, an active compon...

Embodiment 2-5

[0050] This example is used to illustrate the preparation method of the lithium ion secondary battery provided by the present invention.

[0051] The battery pole piece and the battery were prepared according to the method of Example 1, the difference was that during the rolling process of the positive and negative pole pieces, the change values ​​Δd1 and Δd2 of the thickness of the pole pieces during the primary rolling and secondary rolling were changed respectively, The values ​​of Δd1 / Δd after the first rolling are 20%, 30%, 40%, and 50%; the values ​​of Δd2 / Δd after the second rolling are 80%, 70%, 60%, and 50%. Square aluminum-case lithium-ion secondary batteries 043048A4-A6, 043048A7-A9, 043048A10-A12, and 043048A13-A15 with a size of 48×30×4.5 mm were prepared respectively.

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Abstract

A method for preparing pole piece of Li ion cell includes coating size with active material on collector body, drying said collector body then carrying out multiple time of extension-press on said collector body. The Li ion cell equipped with prepared pole piece has narrow scope of volume distribution and excellent stability of circulation property.

Description

technical field [0001] The invention relates to a battery pole piece and a method for preparing a battery using the pole piece, in particular to a battery pole piece and a method for preparing a lithium ion secondary battery using the pole piece. Background technique [0002] In recent years, the development of the high-tech electronics industry has been able to provide miniaturized and light-weight electronic equipment, thus making portable electronic equipment more and more widely used. Lithium-ion secondary batteries have become the preferred energy sources for these portable electronic devices due to their advantages of high discharge voltage, high energy density and long cycle life. [0003] However, when using lithium-ion batteries, people often find that even with batteries of the same manufacturer and model, the service time and cycle life of each battery may vary greatly. This reflects the shortcomings of wide distribution range of battery capacity and unstable cyc...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M10/38H01M10/40H01M4/139H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 肖峰沈河生张才毓
Owner BYD CO LTD
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