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Lithium-ion secondary cell and manufacturing method therefor

A secondary battery and lithium-ion technology, applied in secondary batteries, electrolyte storage battery manufacturing, battery electrodes, etc., can solve the problems of small thickness and high capacity, and achieve the effect of small thickness, high capacity and improved safety performance

Inactive Publication Date: 2010-06-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages of lithium-ion secondary batteries in the prior art that cannot meet the requirements of good safety performance, small thickness and high capacity at the same time, and provide a lithium-ion secondary battery with good safety performance, small thickness and high capacity at the same time. its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of the lithium ion secondary battery of the present invention comprises coating the slurry on the current collector loaded with the positive active material and the binder and / or the current collector loaded with the negative active material and the binder, and Dried to form a film layer, then the positive electrode, negative electrode and separator are prepared into a pole core, and the obtained pole core and non-aqueous electrolyte are sealed in the battery case; the slurry contains inorganic fillers, binders and solvents, wherein, The slurry also contains an active material, wherein the active material in the slurry used for the positive electrode is the positive electrode active material, and the active material in the slurry used for the negative electrode is the negative electrode active material.

[0027] In the slurry for the positive electrode, relative to the weight of the positive electrode active material, the amount of the inorganic fi...

Embodiment 1

[0043] This example illustrates that the present invention provides a lithium-ion battery and a method for preparing the same.

[0044] (1) Preparation of positive electrode

[0045] 10 kg of positive electrode active material LiCoO 2 , 300 grams of polyvinylidene fluoride and 400 grams of conductive agent acetylene black were added to 5 kilograms of N-methylpyrrolidone, and then stirred in a vacuum mixer to form a uniform positive electrode slurry. The slurry was uniformly coated on an aluminum foil, then dried at 150° C., and rolled to obtain a positive electrode sheet formed with the positive electrode material.

[0046] 300 grams of positive electrode active material LiCoO 2 Mix with 700 grams of alumina (manufacturer: Shanghai Yuejiang, the average particle diameter is 0.5 microns) to obtain a mixture, add this mixture to 500 grams of N-methylpyrrolidone, then add 30 grams of polyvinylidene fluoride, and mix well Obtain the slurry for the positive electrode, apply the ...

Embodiment 2

[0053] A battery was prepared according to the method of Example 1, except that a film layer was only formed on the positive electrode. The negative electrode contains 2.7 grams of negative electrode active material artificial graphite. Lithium-ion battery A2 is finally obtained.

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PUM

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Abstract

Disclosed is a lithium ion secondary battery comprising a pole core and a non-aqueous electrolyte, the pole core and the non-aqueous electrolyte are sealed in a battery shell, the pole core includes an anode, a cathode and a diaphragm, the anode includes a current collector and an anode material loaded on the current collector, and the anode material comprises an anode active substance and an adhesive; the cathode includes a current collector and a cathode material loaded on the current collector, and the cathode material includes a cathode active substance and an adhesive; and the anode material and / or the cathode material are provided with a film respectively, each film comprises an inorganic filler and an adhesive, wherein, each film also contains an active substance, wherein, the active substance in the film on the anode material is an anode active substance, and the active substance in the film on the cathode material is a cathode active substance. The battery made by the method has the advantages of good security and also high capacity and small thickness.

Description

technical field [0001] The invention relates to a battery and a preparation method thereof, in particular to a lithium ion secondary battery and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have a wide range of applications due to their advantages such as high specific capacity, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no pollution, light weight, and good safety performance. [0003] Lithium-ion secondary batteries generally comprise a battery case and a pole core and a non-aqueous electrolyte sealed in the battery case; the pole core comprises a positive pole, a negative pole and a diaphragm positioned between the positive pole and the negative pole; the positive pole comprises a positive electrode collector An electric body and a positive electrode material coated thereon; the positive electrode material includes a positive electrode active material, a binder and a con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M4/62H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 吴长伟贾强仟王栋雷磊曾诚
Owner BYD CO LTD