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A negative pole piece and a secondary battery

A negative pole piece and negative electrode technology, applied in the field of electrochemistry, can solve the problems of deteriorating battery power performance and long-term reliability, achieve good cycle performance and kinetic performance, improve kinetic performance, and facilitate infiltration

Active Publication Date: 2021-04-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For power batteries, cost is also a key factor. Regarding the improvement of energy density, considering that the material system remains unchanged, the energy density of the battery will be increased by increasing the coating weight, but this will be greatly deteriorated. Battery power performance and long-term reliability

Method used

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  • A negative pole piece and a secondary battery
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  • A negative pole piece and a secondary battery

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preparation example Construction

[0026] The negative electrode sheet provided by the first aspect of the present invention can be prepared by a known method in the art. For example, the preparation method of the negative electrode sheet may include: forming a first negative electrode active material layer on at least one surface of the negative electrode current collector and forming a second negative electrode active material layer on the first negative electrode active material layer. Those skilled in the art can usually choose an appropriate method to form the negative electrode active material layer according to the structure of the electrode sheet, for example, methods such as coating method, spray coating method, and vapor phase deposition method can be used.

[0027] The second aspect of the present invention provides a secondary battery, which includes the negative electrode sheet provided by the first aspect of the present invention.

[0028] The secondary battery provided by the present invention al...

Embodiment 1

[0038] Positive electrode sheet preparation: Mix positive active material lithium iron phosphate, conductive agent (Super P), and binder (PVDF) in a ratio of 96:2:2, add solvent (NMP), and stir under the action of a vacuum mixer until the system into a uniform and transparent shape to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on the positive electrode current collector aluminum foil; the positive electrode current collector coated with the positive electrode slurry is dried at room temperature and then transferred to an oven for drying, and then subjected to cold pressing, Slitting and other processes to obtain the positive electrode sheet.

[0039] Negative pole piece preparation:

[0040] (1) Mix the first negative electrode active material graphite, conductive agent (Super P), CMC (carboxymethyl cellulose), binder (styrene-butadiene rubber) at a mass ratio of 94.5:1.5:1.5:2.5, and solvent (Deionized water) was uniformly mixed unde...

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Abstract

The invention relates to the field of electrochemistry, in particular to a negative pole piece and a secondary battery including the pole piece. The present invention provides a negative electrode sheet, which includes a negative electrode current collector, a first negative electrode active material layer arranged on at least one surface of the negative electrode current collector, and a second negative electrode active material layer arranged on the first negative electrode active material layer. Material layer, the first negative electrode active material layer includes a first negative electrode active material, the second negative electrode active material layer includes a second negative electrode active material, and the first negative electrode active material satisfies 1GPa≤Young's modulus≤10GPa, The second negative electrode active material satisfies 11GPa≤Young's modulus≤30GPa. The inventors of the present invention provide a new negative electrode sheet. The upper layer forms a negative electrode active material layer formed by a certain proportion of high Young's modulus negative electrode active material, which can effectively increase the energy density of the battery cell and reduce the cost at the same time.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a negative pole piece and a secondary battery including the pole piece. Background technique [0002] Recently, the demand in the power battery market has gradually expanded, and the demand for the energy density and power density of power batteries has also become higher and higher. For power batteries, cost is also a key factor. Regarding the improvement of energy density, considering that the material system remains unchanged, the energy density of the battery will be increased by increasing the coating weight, but this will be greatly deteriorated. Battery power performance and long-term reliability. [0003] How to obtain a battery that can take into account both good electrochemical performance and kinetic performance is a common problem in the industry. Contents of the invention [0004] In view of the problems in the background technology, the present invention provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/36H01M10/0525
CPCH01M4/13H01M4/366H01M10/0525H01M2004/021Y02E60/10H01M2004/027H01M4/133H01M4/134H01M4/661H01M4/0404H01M4/139
Inventor 黄亚萍郭明奎王耀辉林永寿赵丰刚
Owner CONTEMPORARY AMPEREX TECH CO
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