Method for producing anode of lithium ion battery

A lithium-ion battery and positive electrode technology, applied in the field of preparation of lithium-ion battery positive electrodes, can solve the problems of low pass rate of overcharge performance test and low pass rate of batteries, achieve improved pass rate of overcharge performance test, simple preparation process, cost reduction effect

Active Publication Date: 2008-05-14
BYD CO LTD
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Problems solved by technology

However, in the overcharge performance test of the batteries made by these methods, the passing rate of the overcharge performance test is all low, resulting in a low battery pass rate in the process of mass production of batteries.
In addition, the methods in the prior art realize the safety performance of the battery by sacrificing the performance of the battery such as capacity, storage performance and cycle performance.

Method used

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  • Method for producing anode of lithium ion battery
  • Method for producing anode of lithium ion battery

Examples

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preparation example Construction

[0011] The preparation method of the positive electrode of the lithium ion battery provided by the present invention includes coating the positive electrode slurry on the current collector, and then drying the sheet to obtain the current collector containing the positive electrode material layer, and pressing the current collector containing the positive electrode material layer into a sheet, the positive electrode The material layer contains a positive electrode active material and a binder.

[0012] According to the present invention, when the current collector containing the positive electrode material layer is pressed into a sheet, it is sufficient that the binder is in a molten state. Preferably, when the current collector containing the positive electrode material layer is pressed into a sheet, the temperature of the positive electrode material layer is 160-250°C.

[0013] According to the present invention, the tableting method is well known to those skilled in the art ...

Embodiment 1

[0028] This example is used to illustrate the preparation method of the positive electrode of the battery provided by the present invention and the lithium ion battery prepared by using the positive electrode.

[0029] (1) Preparation of positive electrode

[0030] Dissolve 30 grams of polyvinylidene fluoride (PVDF) in 450 grams of N-methylpyrrolidone (NMP) solvent to prepare a binder solution, and then mix 940 grams of LiCoO 2Add 30 grams of acetylene black powder into the above solution, stir and mix evenly to obtain a positive electrode slurry; use a pulper to evenly coat the positive electrode slurry on both sides of an aluminum foil with a thickness of 18 microns to form a coating with a thickness of 0.18 mm. cloth layer, then place the positive electrode in an oven and bake at 100°C for 5 hours, and then place it in a high-temperature tablet press with a roller temperature of 185°C and a roller speed of 5 rpm (produced by BYD Co., Ltd. LB-2006R), the temperature of the ...

Embodiment 2

[0038] Prepare the positive electrode of the battery and the battery according to the method of Example 1. The difference is that the positive electrode is first placed in an oven and baked at 160°C for 10 hours, and then quickly transferred to a roller with a temperature of 160°C and a roller speed of Tablet pressing was carried out on a high-temperature tablet press machine (manufactured by BYD Co., Ltd., model LB-2006R) at 20 rpm. The temperature of the positive electrode material layer was 160° C. during tablet pressing, and cooled after tablet pressing. Finally, lithium ion battery A2 was produced.

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Abstract

A preparation method for making lithium ion battery cathode, including the processes: coat current collector with cathode slurry and then parch chip to get the current collector which contains cathode material layer; squash current collector which contains cathode material layer; the cathode material layer contains cathode active substance and adhesive; the adhesive is at melting when squashing current collector which contains cathode material layer. The invention gets battery positive plate by hot-pressing when the adhesive is at melting and improves the pass rate of over-charge property of battery which adopts the cathode plate remarkably; for example, the pass rate of over-charge property of the lithium ion battery which is made according to the invention method is much higher than that of the lithium ion battery which is made according to the current method.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode of a battery, in particular to a method for preparing a positive electrode of a lithium ion battery. Background technique [0002] Lithium-ion battery is a new type of chemical power source, which has the characteristics of high energy density, high voltage, no pollution, no metal lithium, high cycle life, no memory effect, and fast charging speed. Therefore, it is widely used in electronic equipment such as personal computers, mobile phones, and portable appliances. [0003] However, lithium-ion batteries have safety issues under overcharge conditions, which is also a matter of concern. When the lithium-ion battery is overcharged, because the battery voltage rises rapidly with the increase of polarization, it will cause irreversible changes in the structure of the positive active material and the oxidative decomposition of the electrolyte, which will generate a large amount of gas a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/48H01M4/62H01M4/139
CPCY02E60/12Y02E60/10
Inventor 刘卫平雷裕东肖宏刘斯源
Owner BYD CO LTD
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