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Battery anode, lithium-ion battery using same and their production

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

Active Publication Date: 2009-03-18
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 Composite lithium-ion batteries have the disadvantages of low capacity and low battery internal space utilization, and provide a battery positive electrode that can simultaneously improve battery capacity and battery internal space utilization and a lithium-ion battery using the positive electrode.

Method used

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Examples

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Effect test

preparation example Construction

[0021] The preparation method of the positive electrode of the battery provided by the present invention comprises coating and / or filling the slurry containing the positive electrode material and the solvent on the conductive substrate, drying, and calendering. The positive electrode material includes a positive electrode active material, a conductive agent and a binder, 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 calendering pressure makes the dressing density of the positive electrode material 3.4-3.8 g / cm 3 .

[0022]The most critical factor affecting the dressing density of the positive electrode material is the calendering pressure. In order to achieve the dressing density described in the present invention, generally speaking, the calendering pressure is controlled at 1.6-2.4 MPa. In addition, the tap density of the positive electrode active material is also a factor affecting the density of the positive electro...

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 The positive electrode 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 50 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 under a pressure of 1.6 MPa and then cut on a slitting machine to obtain a size of 385 mm × 42 mm × 135 micron positive electrode, which contains 4.42 grams of positive electrode material, and the coating density of the obtained pos...

Embodiment 2

[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] (1) Preparation of positive electrode

[0049] The tap density of 100 parts by weight is 1.8 g / cm 3 The positive electrode 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 50 parts by weight of N-methylpyrrolidone (NMP), 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 under a pressure of 1.8 MPa and then cut on a slitting machine to obtain a size of 385 mm × 42 mm × 135 micron positive electrode, which contains 4.39 grams of positive electrode material, and the coating density of the obtained pos...

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Abstract

The invention is concerned with the lithium ion battery positive electrode, includes the conductive base body, and the anode material smearing and / or filling on the conductive base body, the anode material includes the anode active material, the conductive liquid and the bond, the anode active material is LiNixCoyMn1-x-yO2, 0.1<=x<=0.5 and 0.1<= y<=0.5 in the formula, the characteristic is: the dressing density of the anode active material is 3.4-3.8 grams / cube centimeters. The invention is higher capability and higher space using rate.

Description

technical field [0001] The present 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 an...

Claims

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Application Information

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