Battery anode and lithium ion battery using the same and their production method

A battery positive electrode and positive electrode technology, applied in the field of lithium-ion batteries and their preparation, can solve the problems of poor storage performance and cycle performance, achieve good storage performance and cycle performance, inhibit reaction, and ensure capacity

Active Publication Date: 2010-12-22
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of poor storage performance and cycle performance of lithium-ion batteries in the prior art, to provide a battery positive electrode with high storage performance and cycle performance and a lithium-ion battery using the positive electrode

Method used

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  • Battery anode and lithium ion battery using the same and their production method

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preparation example Construction

[0039] The preparation method of the negative electrode can adopt conventional preparation methods. For example, the negative electrode can be obtained by mixing the negative electrode active material, conductive agent and binder with a solvent, coating and / or filling on the current collector, drying, and compression molding or not. Wherein, the solvent can be selected from N-methylpyrrolidone (NMP), N, N-dimethylformamide (DMF), N, N-diethylformamide (DEF), dimethyl sulfoxide (DMSO ), tetrahydrofuran (THF), and one or more of water and alcohols. The amount of the solvent can make the paste have viscosity and fluidity, and it only needs to be able to be coated on the current collector. Generally, based on the weight of the negative electrode active material, the content of the solvent is 30-80% by weight, preferably 35-60% by weight. Wherein, the methods and conditions of drying and compression molding are well known to those skilled in the art. The negative electrode curre...

Embodiment 1

[0045] This example is used to illustrate the positive electrode of the battery provided by the present invention, the lithium ion battery using the positive electrode and their preparation methods.

[0046] (1) Preparation of positive electrode

[0047] a: The cathode material coating slurry was prepared by the following method: 15 grams of polyvinylidene fluoride (Atofina, 761#PVDF) was dissolved in 225 grams of N-methyl-2-pyrrolidone (NMP) solvent. Obtain binder solution, disperse 15 grams of carbon black (the commodity of TIMICAL company, trade name is super-p) in above-mentioned binder solution, then add 500 grams of lithium manganese oxides in gained solution, fully mix and make positive electrode Material Coating Slurry X1.

[0048] b: The second coating slurry is prepared by the following method: the average particle diameter D 50 500 grams of lithium manganese oxide of 8 microns, average particle diameter D 50 0.5 µm Y 2 o 3 5 grams were added to the ball mill t...

Embodiment 2

[0062] Lithium-ion battery is prepared according to the method of Example 1, the difference is that the positive electrode active material in the positive electrode of the battery is lithium cobalt oxygen, the thickness of the positive electrode material coating of the positive electrode of the battery is 0.24 millimeters, and the thickness of the second coating is 0.01 millimeters, The metal oxide used in the second coating is SnO 2 , with an average particle diameter of 0.1 microns, the metal oxide SnO in the second coating slurry X2 2 The dosage is 0.5 g (SnO 2 The weight is 0.1% of the lithium cobalt oxygen weight in the second coating slurry X2), and the lithium ion battery A2 is obtained.

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Abstract

The present invention relates to a battery anode, which comprises a collecting body and an anode material coating layer that is coated on the collecting body, the anode material comprises an anode active substance, a conducting agent and an adhesion agent, wherein, the anode also comprises a second coating layer, the second coating layer is coated on the surface of the anode material coating layer, the second coating layer comprises metal oxide, anode active substance, a conducting agent and an adhesion agent; the metal oxide is one or more of the metal oxide in the IIA group, the IIIA group,the IVA group, the IIB group, the IIIB group and the IVB group. The battery prepared with the anode of the present invention has good storage performance and good cycling performance; especially under the condition of high temperature, the advantages of the battery prepared by the present invention on the aspect of the storage performance and the cycling performance are more obvious.

Description

technical field [0001] The present invention relates to a positive pole of a battery, a battery using the positive pole and a preparation method thereof, more particularly to a positive pole of a battery, a lithium ion battery using the positive pole and a preparation method thereof. Background technique [0002] As a chemical power source, a lithium-ion battery mainly includes a pole core and a non-aqueous electrolyte sealed in a battery case. Wherein, the pole core includes battery electrodes and separators. The battery electrodes are further divided into positive and negative electrodes. The positive and negative electrodes respectively contain a positive active material and a negative active material capable of intercalating and releasing lithium ions reversibly. The positive electrode active material is mainly lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide, which can release and intercalate lithium ions. The negative electrode active material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/62H01M4/04H01M10/40H01M4/13H01M4/139H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 孙华军
Owner BYD CO LTD
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