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Cell positive pole and lithium ion cell using said positive pole and method for making them

A technology of lithium-ion batteries and positive poles, which is applied in the field of battery positive poles and lithium-ion batteries using the positive poles and their preparation, can solve the problems of low capacity of lithium-ion batteries and low utilization of internal space in batteries, and achieve safety performance and Guaranteed discharge performance, improved space utilization, and the effects of high battery capacity

Active Publication Date: 2007-06-13
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention purpose of the present invention is to overcome existing use LiNiCoMnO 2 Lithium-ion batteries of composite materials have the disadvantages of low capacity and low battery internal space utilization, and provide a battery positive electrode that can simultaneously increase battery capacity and battery internal space utilization and reduce raw material costs and a lithium ion battery using the positive electrode. Battery

Method used

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Examples

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preparation example Construction

[0023] The preparation method of the positive electrode provided by the present invention includes coating and / or filling the slurry containing the positive electrode material and the solvent on the conductive substrate, drying, calendering or not calendering, and the positive electrode material includes a positive electrode active material, a conductive agent and a binding agent. agent, the positive active material is LiNi x co y mn 1-x-y o 2 , where, 0.1≤x≤0.5, 0.1≤y≤0.5, wherein the tap density of the positive active material is 1.5-2.5 g / cm 3 , median particle size D 50 8-16 microns, the specific surface area obtained by low-temperature nitrogen adsorption BET method is greater than 0.1-less than 1 meter 2 / gram. The solvent can be selected from one of N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) or several kinds; the amount of solvent can make the paste have viscosity and fluidity, and ca...

Embodiment 1

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

[0038] (1) Preparation of positive electrode

[0039] The tap density of 100 parts by weight is 1.6 g / cm 3 , with a specific surface area of ​​0.8 m 2 / g, median particle size D 50 9.8 microns, I on the XRD pattern 003 / I 004 =1.20 positive active material LiNi 0.33 co 0.33 mn 0.34 o 2 , 4 parts by weight of binder polyvinylidene fluoride (PVDF), 4 parts by weight of conductive agent acetylene black are added in 45 parts by weight of N-methylpyrrolidone (NMP), then stirred in a vacuum mixer to form a uniform positive electrode slurry .

[0040] 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. Conta...

Embodiment 2-5

[0047] This example illustrates the positive electrode provided by the present invention, the lithium ion battery containing the positive electrode and their preparation methods.

[0048] According to the same method as in Example 1, positive poles and lithium ion batteries A2-A5 comprising the positive poles were prepared, except that LiNi 0.33 co 0.33 mn 0.34 o 2 Tap density, specific surface area, median particle size D 50 and I 003 / I 004 The values ​​were 1.6 g / cm 3 , 0.2 meters2 / g, 9.0 micron, 1.18, 2.1 g / cm 3 , 0.8 meters 2 / g, 9.8 microns, 1.25, 1.6 g / cm 3 , 0.8 meters 2 / g, 15.0 micron, 1.00 and 1.8 g / cm 3 , 0.4 meters 2 / g, 12.0 micron, 1.35.

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PUM

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Abstract

The anode includes conduction base body, and anode material painted and / or filled on the conduction base body. The anode material includes active material of anode, conduction agent, and binding agent. The active material of anode is LiNixCoyMn1-x-yO2. Characters are that tap density of the active material of anode is 1.5-2.5 g / cm3, median size D50 is 8-16 micros, and specific surface area obtained through BET method of nitrogen adsorption under low temperature is larger than 0.1 and smaller than 1.2 m / g. The disclosed lithium ion battery possesses higher capacity and utilization ratio of space.

Description

technical field [0001] The invention relates to a positive electrode of a battery, a battery using the positive electrode, and a preparation method thereof. Specifically, the present invention relates to a positive electrode of a battery, a lithium ion battery using the positive electrode, 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 battery electrode and diaphr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04H01M10/40H01M4/131H01M4/505H01M4/525H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 肖峰江文锋
Owner BYD CO LTD
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