Lithium ion battery core and preparation method thereof and battery

A lithium-ion battery and cell technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation process and insignificant improvement of battery low-temperature discharge performance, and achieve simple preparation process and low-temperature discharge performance. Excellent, easy-to-industrial effect

Active Publication Date: 2009-07-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the low-temperature discharge performance of the battery in the prior art that the improvement effect is not significant and the preparation process is complicated

Method used

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Examples

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Effect test

preparation example Construction

[0034] A conventional preparation method can be used for the preparation method of the negative electrode sheet. For example, the negative electrode sheet can be obtained by mixing the negative electrode material with a solvent, coating and / or filling it on the current collector, drying, and calendering or not. Wherein, the solvent can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (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. Wherein, the methods and conditions of drying and calendering are well known to those skilled in the art. For example, the drying temperature is generally 100-150°C.

[0035]The non-aqueous electrolytic solution is a mixed solution of electrolyte lithium salt and non-aqueous solvent, which is not particularly limited, and conv...

Embodiment 1

[0039] This example illustrates the positive electrode provided by the present invention, the lithium ion battery containing the positive electrode and their preparation methods.

[0040] (1) Preparation of positive electrode sheet

[0041] The positive electrode active material lithium cobaltate (LiCoO 2 ), conductive agent acetylene black, binder PVDF and organic solvent N-dimethylpyrrolidone (NMP) according to the mass ratio of LiCoO 2 : Acetylene black: PVDF: NMP = 100: 4: 1.5: 40 mixed and stirred evenly to make a positive electrode slurry, which was evenly coated on an aluminum foil with a width of 400 mm and a thickness of 20 microns, and then dried at 120 ° C , to obtain a positive electrode sheet with a thickness of 180 μm.

[0042] After the current collector of the positive electrode material was rolled under a pressure of 3 MPa, it was slit on a slitting machine to obtain a positive electrode sheet with a size of 490 mm×42 mm×135 μm, which contained 8.1 grams of ...

Embodiment 2

[0059] Lithium-ion battery A2 was obtained in the same manner as in Example 1, except that the positive electrode active material was lithium iron phosphate.

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Abstract

A lithium ion battery cell comprises a positive plate, a negative plate, a septum between the positive plate and the negative plate and an overlay which is painted on an exterior layer of the battery cell and contains inorganic oxide particles and an adhesive. The inorganic oxide is one or a plurality of the following components: titanium oxide, alumina, magnesia and silicon dioxide. The low-temperature discharging property of the battery cell is excellent; and simultaneously, the preparation technique is simple and is easy for industrialization.

Description

technical field [0001] The invention relates to a lithium-ion battery cell, a preparation method thereof, and a battery containing the cell. Background technique [0002] In the production and manufacture of lithium-ion batteries, the manufacturing method of electrodes (positive and negative electrodes) is usually: mix positive and negative electrode materials, conductive agents, and binders in a liquid medium in a certain proportion to obtain a slurry, and then coat the slurry Spread on the current collector, heat and bake to volatilize and remove the liquid medium. [0003] The performance of the positive electrode is one of the key factors restricting the performance of lithium-ion batteries. For positive electrode performance, scholars at home and abroad have done surface modification work on positive electrode materials, such as a lithium ion secondary battery disclosed in CN101019266A, comprising a positive electrode of composite lithium oxide; a negative electrode ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M4/02H01M4/48H01M4/58H01M4/62H01M10/40
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 王炜娜
Owner BYD CO LTD
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