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Battery anode and lithium ion secondary battery using the same

A lithium-ion battery and positive electrode technology, which is applied in the field of lithium-ion secondary batteries, can solve the problems of battery capacity reduction, difficulty in obtaining a balance between battery discharge performance, capacity, and volume, and achieve the effect of improving discharge performance and discharge performance

Inactive Publication Date: 2011-01-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the lithium-ion battery is closely related to the thickness of the positive electrode. Although the method of reducing the amount of positive active material in the positive electrode can reduce the thickness of the positive electrode sheet, thereby reducing the thickness of the battery, the capacity of the battery is also reduced
Therefore, it is difficult to obtain a positive electrode that takes into account battery discharge performance, capacity and volume in the prior art.

Method used

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  • Battery anode and lithium ion secondary battery using the same

Examples

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preparation example Construction

[0025] The preparation method of the positive electrode can adopt conventional preparation methods. For example, the positive electrode can be obtained by mixing the positive electrode active material, conductive agent and binder with a solvent, coating and / or filling on the current collector, drying, and compression molding or not. Preferably, the preparation method of the positive electrode includes coating and / or filling the slurry containing the positive active material, the conductive agent, the binder and the solvent on the current collector, drying, calendering or not calendering, wherein, the The solvent can be selected from one of N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) or several; the amount of the solvent can make the paste have viscosity and fluidity, and can be coated on the current collector. Generally, based on the weight of the positive electrode active material, the content of...

Embodiment 1

[0037] This example illustrates the positive electrode provided by the present invention and the lithium ion battery containing the positive electrode.

[0038] (1) Preparation of positive electrode

[0039] 100 g of the positive active ingredient LiCoO 2 , 3 grams of polyvinylidene fluoride, 1 gram of carbon black (the DBP oil absorption value is 495, and the average particle diameter is 40 microns) and 3 grams of acetylene black (the average particle diameter is 40 microns) are added to 50 grams of N-methyl-2- pyrrolidone, and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0040] The slurry was evenly coated on aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode with a size of 540×43.5 mm, which contained 7.6 grams of active ingredient LiCoO 2 .

[0041] (2) Preparation of negative electrode

[0042] 100 grams of negative electrode active ingredient natural graphite, binder is a mixture of 1 gram of carboxymet...

Embodiment 2

[0047] Prepare positive pole and battery according to the method for embodiment 1, difference is, the conductive agent in described positive pole is 1.3 grams of carbon black (DBP oil absorption value is 495, and average particle diameter is 40 microns) and 2.7 grams of acetylene black (average particle diameter is 40 microns). The positive electrode contains 7.57 grams of active ingredient LiCoO 2 . Finally, lithium ion battery A2 was produced.

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Abstract

An anode of a lithium ion battery comprises a current collector and an anode material coated on and / or filled in the current collector. The anode material comprises an anode active material, a conductive agent and an adhesive, wherein the conductive agent is carbon black and acetylene black; moreover, the weight ratio of the carbon black to the acetylene black is 1 to between 1 and 10. Due to taking the carbon black and the acetylene black as the conductive agent in the weight ratio of 1 to between 1 and 10, the discharging property of the battery is substantially improved; meanwhile, the battery obtained by the anode has high capacity and low thickness.

Description

technical field [0001] The invention relates to a positive pole of a battery and a battery using the positive pole, in particular to a positive pole of a battery and a lithium ion secondary battery using the positive pole. Background technique [0002] Lithium-ion secondary batteries generally comprise a battery case and an electrode group and an electrolyte that are sealed in the battery case; the electrode group includes a positive pole, a negative pole, and a diaphragm between the positive pole and the negative pole; the positive pole includes a positive electrode collector The body and the negative electrode material coated thereon; the positive electrode material includes a positive electrode active material, a binder and a conductive agent. [0003] Lithium-ion secondary battery is actually a lithium ion concentration difference battery. When charging, lithium ions are extracted from the positive electrode active material and embedded in the lattice of the negative el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/62H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 肖宏彭磊刘卫平
Owner BYD CO LTD