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Cathode plate, lithium ion secondary battery and manufacturing method thereof

A manufacturing method and secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of active lithium exposure, complex lithium supplementation process, and deterioration of battery performance, and achieve good conductivity and stability. Improvement of cycle performance, effect of improving cycle performance

Active Publication Date: 2019-01-04
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the battery lithium supplementation process, the currently widely used lithium supplementation methods and processes mainly include direct bonding or pressing of lithium sheets on the anode or cathode, direct doping of lithium powder on the cathode or anode or dispersion with a solvent to form a solution In the form of spraying or coating on the surface of the cathode and anode, the above methods will directly expose the active lithium; and the above-mentioned lithium supplementation process is more complicated
[0005] In addition, there is a method of adding organic lithium salt to the cathode or anode in the lithium supplementation process of the battery cell, and this method introduces organic lithium salt impurities into the cathode or anode, which will deteriorate the performance of the battery cell to a certain extent, and on the other hand On the one hand, the lithium in the electrolyte organolithium salt of the lithium-ion secondary battery is difficult to be fully utilized, thereby reducing the lithium utilization rate of the lithium-ion secondary battery
[0006] In summary, the current lithium supplementation methods have certain problems in terms of operability, popularity, utilization rate and actual effect, and cannot well compensate for the active lithium consumed by the first irreversible capacity loss. Density is limited

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  • Cathode plate, lithium ion secondary battery and manufacturing method thereof
  • Cathode plate, lithium ion secondary battery and manufacturing method thereof

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Effect test

Embodiment 1

[0064] Cathode plate manufacturing:

[0065] The lithium iron phosphate active material LiFePO 4 and polythiophene-modified lithium-rich manganese oxide Li 2 MnO 3Mix evenly at a weight ratio of 100:3 to form a mixed powder. Wherein, the mixing method adopts the stirring and mixing method, the stirring and mixing time is 30min to 120min, and the stirring linear velocity is 1 m / min to 5m / min. Put the mixed powder, conductive carbon black Super-P, and polyvinylidene fluoride in the N-methylpyrrolidone solvent in a weight ratio of 95:2:3, stir and mix well to form a slurry, and put The weight ratio of the materials in the N-methylpyrrolidone solvent is only calculated based on the weight of the cathode active material, excluding the weight of the lithium-rich manganese oxide modified by polythiophene as the dopant material. The stirring time is 60min to 180min, and the stirring line Speed ​​control is 4m / min~12m / min. The slurry is coated on the aluminum foil, and the cathode...

Embodiment 2

[0067] Cathode plate manufacturing:

[0068] The lithium iron phosphate active material LiFePO 4 and polythiophene-modified lithium-rich manganese oxide Li 2 MnO 3 Mix evenly at a weight ratio of 100:5 to form a mixed powder. Wherein, the mixing method adopts the stirring and mixing method, the stirring and mixing time is 30min to 120min, and the stirring linear velocity is 1 m / min to 5m / min. Put the mixed powder, conductive carbon black Super-P, and polyvinylidene fluoride in the N-methylpyrrolidone solvent in a weight ratio of 95:2:3, stir and mix well to form a slurry, and put The weight ratio of the materials in the N-methylpyrrolidone solvent is only calculated based on the weight of the cathode active material, excluding the weight of the lithium-rich manganese oxide modified by polythiophene as the dopant material. The stirring time is 60min to 180min, and the stirring line Speed ​​control is 4m / min~12m / min. The slurry is coated on the aluminum foil, and the cathod...

Embodiment 3

[0070] Cathode plate manufacturing:

[0071] The lithium iron phosphate active material LiFePO 4 and polythiophene-modified lithium-rich manganese oxide Li 2 MnO 3 Mix evenly at a weight ratio of 100:10 to form a mixed powder. Wherein, the mixing method adopts the stirring and mixing method, the stirring and mixing time is 30min to 120min, and the stirring linear velocity is 1 m / min to 5m / min. Put the mixed powder, conductive carbon black Super-P, and polyvinylidene fluoride in the N-methylpyrrolidone solvent in a weight ratio of 95:2:3, stir and mix well to form a slurry, and put The weight ratio of the materials in the N-methylpyrrolidone solvent is only calculated based on the weight of the cathode active material, excluding the weight of the lithium-rich manganese oxide modified by polythiophene as the dopant material. The stirring time is 60min to 180min, and the stirring line Speed ​​control is 4m / min~12m / min. The slurry is coated on the aluminum foil, and the catho...

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Abstract

The invention relates to a cathode plate, a lithium ion secondary battery and a manufacturing method thereof. The cathode plate comprises a current collector; a cathode active material layer arrangedon the current collector, comprising a cathode active material and a granular lithium-rich transition metal oxide material modified with a conductive polymer, the chemical formula of the lithium-richtransition metal oxide material being LixMeyOz, 1<=x<=2, 1<=y<=2, 3<=z<=4, Me is one or more of Mn, Ti, Cr and Zr, and the conductive polymer is one or more of polyacetylene, polythiophene, polypyrrole, polyaniline, polyphenylene, polyphenylene vinylene and polydiyne. The cathode plate provided by the invention has a simple lithium supplement process, can effectively make up for the active lithiumconsumed by the first-time irreversible capacity loss, and can improve the energy density of the lithium ion secondary battery cell.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a cathode pole piece, a lithium ion secondary battery and a manufacturing method thereof. Background technique [0002] With the application and promotion of power batteries in electric vehicles, the energy density of batteries has received more and more attention and challenges. Under the continuous improvement and research on energy density, the performance of batteries has been greatly improved. However, for lithium-ion secondary batteries, the first irreversible capacity loss of the battery cell is unavoidable, and the lithium iron phosphate, nickel-cobalt-manganese, nickel-cobalt-aluminum ternary materials used in the battery cell, and the combination of the above-mentioned cathode conventional materials For the conventional anode material graphite, the first irreversible capacity loss of the battery cell is quite large, which largely hinders the further improvem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/36H01M4/505H01M4/60H01M10/0525
CPCH01M4/131H01M4/1391H01M4/364H01M4/505H01M4/602H01M10/0525Y02E60/10
Inventor 王耀辉郭明奎金海族
Owner CONTEMPORARY AMPEREX TECH CO