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A lithium ion battery and preparing method thereof

A lithium-ion battery and electrode group technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor safety performance and cycle performance, and achieve the effect of improving safety performance

Active Publication Date: 2009-07-08
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 existing use of LiNiCoMnO 2 Lithium-ion batteries of composite materials have the disadvantages of poor safety performance and cycle performance, and provide a lithium-ion battery with good safety performance and cycle performance and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of lithium ion battery provided by the invention comprises:

[0027] Coating and / or filling the positive electrode slurry containing the positive electrode material on the positive electrode conductive substrate, drying, calendering or not calendering, to obtain the positive electrode, the positive electrode material includes a positive electrode active material and a positive electrode binder, and the positive electrode active material is LiNi x co y mn 1-x-y o 2 , 0.1≤x≤0.5, 0.1≤y≤0.5;

[0028] Coating and / or filling the negative electrode slurry containing the negative electrode material on the negative electrode conductive substrate, drying, calendering or not, to obtain the negative electrode, the negative electrode material including the negative electrode active material and the binder;

[0029] And the positive electrode, the negative electrode and the diaphragm are prepared into an electrode group, and the obtained electrode group and...

Embodiment 1

[0036] This example illustrates the lithium ion battery provided by the present invention and its preparation method.

[0037] (1) Preparation of positive electrode

[0038] 100 parts by weight of the positive electrode active material LiNi 0.33 co 0.33 mn 0.34 o 2 , 4 parts by weight of binder PVDF, 5 parts by weight of conductive agent acetylene black were added to 40 parts by weight of N-methylpyrrolidone (NMP), and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0039] The slurry is evenly coated on an aluminum foil with a width of 400 mm and a thickness of 20 microns, then dried at 120 ° C, rolled, and then cut on a slitting machine to obtain a positive electrode with a size of 385 mm × 42 mm × 135 microns. Contains 4.8 grams of positive electrode mix.

[0040] (2) Preparation of negative electrode

[0041] 100 parts by weight of negative electrode active material natural graphite, 4 parts by weight of binder polytetrafluoroethylene (PT...

Embodiment 2

[0047] This example illustrates the lithium ion battery provided by the present invention and its preparation method.

[0048] (1) Preparation of positive electrode

[0049] 100 parts by weight of the positive electrode active material LiNi 0.1 co 0.1 mn 0.8 o 2 , 1 weight part of binder PVDF, 4 weight parts of conductive agent acetylene black were added to 70 weight parts of N-methylpyrrolidone (NMP), and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0050] The slurry is evenly coated on an aluminum foil with a width of 400 mm and a thickness of 20 microns, then dried at 120 ° C, rolled, and then cut on a slitting machine to obtain a positive electrode with a size of 385 mm × 42 mm × 135 microns. Contains 4.8 grams of positive electrode mix.

[0051] (2) Preparation of negative electrode

[0052] 100 parts by weight of negative electrode active material natural graphite, 2 parts by weight of binder polytetrafluoroethylene (PTFE), 6 parts ...

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Abstract

A lithium ion battery, the lithium ion battery includes an electrode group and a nonaqueous electrolyte, the electrode group and the nonaqueous electrolyte are sealed in a battery case; the electrode group includes a positive pole, a negative pole and a separator; the positive pole includes a positive pole Conductive substrate and positive electrode material coated and / or filled on the positive electrode conductive substrate, the positive electrode material includes positive electrode active material and positive electrode binder, the positive electrode active material is LiNixCoyMn1-x-yO2, 0.1≤x≤0.5, 0.1≤y≤0.5; the negative electrode includes a negative electrode conductive substrate and a negative electrode material coated and / or filled on the negative electrode conductive substrate, the negative electrode material includes a negative electrode active material and a negative electrode binder, wherein the positive electrode active material The weight ratio to the negative electrode active material is 0.5-2.2. The lithium ion battery provided by the invention has good cycle performance and safety performance.

Description

technical field [0001] The present invention relates to a battery and a preparation method thereof, specifically, the present invention relates to a lithium ion battery and a preparation method thereof. Background technique [0002] As a chemical power source, a lithium-ion battery refers to a secondary battery that uses two compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode, and vice versa during discharge. Lithium ion battery mainly comprises electrode group and non-aqueous electrolytic solution, and described electrode group and non-aqueous electrolytic solution are sealed in the battery case, and described electrode group comprises positive pole, negative pole and separator, and described positive pole comprises positive electrode conductive matrix and coating and / or the positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/38H01M4/58H01M4/48H01M4/62
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 肖峰江文锋
Owner BYD CO LTD
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