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Method for reducing the orientation value of lithium-ion battery graphite negative pole piece and the resulting pole piece

A lithium-ion battery and graphite negative electrode technology, applied in battery electrodes, electrode manufacturing, electrode current collector coating, etc., can solve the problems of difficult lithium ions, short circuit, difficult insertion of lithium ions on the base surface, etc., to speed up deintercalation, Effect of improving rate performance and low temperature performance

Active Publication Date: 2022-03-04
合肥国轩新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the layered structure of the graphite negative electrode does not have the ability to quickly deintercalate lithium ions. Under high current and low temperature conditions, lithium ions are inserted into the graphite layer through the end face of the graphite layer structure, and the basal surface is difficult to insert. Lithium ions, lithium ions are difficult to quickly intercalate between graphite layers, and lithium dendrites may be formed on the negative electrode graphite surface, resulting in short circuit and safety problems. Therefore, it cannot meet the fast charging requirements of lithium ion batteries proposed by people today.

Method used

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  • Method for reducing the orientation value of lithium-ion battery graphite negative pole piece and the resulting pole piece
  • Method for reducing the orientation value of lithium-ion battery graphite negative pole piece and the resulting pole piece
  • Method for reducing the orientation value of lithium-ion battery graphite negative pole piece and the resulting pole piece

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Embodiment 1

[0024] A kind of method that the present invention proposes reduces the orientation value of graphite negative pole piece of lithium ion battery, comprises the following steps:

[0025] S1, prepare graphite negative electrode slurry with volatile organic solvent as additive;

[0026] S2, coating the prepared graphite negative electrode slurry on the current collector to obtain a pretreated pole piece;

[0027] S3, blowing and drying the pretreated pole piece in S2.

[0028] The present invention also proposes a lithium-ion battery graphite negative pole piece, which is prepared by adopting the method for reducing the orientation value of the lithium-ion battery graphite negative pole piece.

Embodiment 2

[0030] A kind of method that the present invention proposes reduces the orientation value of graphite negative pole piece of lithium ion battery, comprises the following steps:

[0031] S1, preparing graphite negative electrode slurry with methanol as an additive; wherein, the added mass of methanol is 1% of the mass of graphite negative electrode slurry;

[0032] S2, coating the prepared graphite negative electrode slurry on a copper foil to obtain a pretreated pole piece;

[0033] S3. Air-dry the pre-treated pole piece in S2; wherein, during the blow-drying process, the wind direction of the blowing is parallel to the surface of the pre-treated pole piece; the time of blow-drying is 12 hours, and the temperature of blow-drying is 60°C. The wind speed of blow drying is 6m / s.

[0034] The present invention also proposes a lithium-ion battery graphite negative pole piece, which is prepared by adopting the method for reducing the orientation value of the lithium-ion battery gra...

Embodiment 3

[0036] A kind of method that the present invention proposes reduces the orientation value of graphite negative pole piece of lithium ion battery, comprises the following steps:

[0037] S1, preparing graphite negative electrode slurry with absolute ethanol as an additive; wherein, the added mass of absolute ethanol is 10% of the mass of graphite negative electrode slurry;

[0038] S2, coating the prepared graphite negative electrode slurry on a copper foil to obtain a pretreated pole piece;

[0039] S3. Blow drying the pretreated pole piece in S2; wherein, during the blow drying process, the wind direction of the blowing is parallel to the surface of the pretreated pole piece; the blow drying time is 4h, and the blow drying temperature is 100°C. The wind speed of blow drying is 30m / s.

[0040] The present invention also proposes a lithium-ion battery graphite negative pole piece, which is prepared by adopting the method for reducing the orientation value of the lithium-ion ba...

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Abstract

The invention discloses a method for reducing the orientation value of a graphite negative pole piece of a lithium ion battery and the resulting pole piece. The method comprises the following steps: preparing a graphite negative pole slurry with a volatile organic solvent as an additive; preparing the prepared graphite The negative electrode slurry is coated on the current collector to obtain a pretreated pole piece; the pretreated pole piece is air-dried. The method for reducing the orientation value of the graphite negative pole piece of the lithium-ion battery proposed by the invention has a simple process, and the orientation value of the obtained pole piece is reduced, and the rate performance and low-temperature performance of the lithium-ion battery can be improved when used in the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for reducing the orientation value of a graphite negative pole piece of a lithium-ion battery and the resulting pole piece. Background technique [0002] With the development of new energy electric vehicles, power lithium-ion batteries will have a huge market for a long period of time. The electrode material is a major factor affecting the performance of the power lithium-ion battery, and the negative electrode material is one of the key factors determining the performance of the lithium-ion battery. At present, commercial lithium-ion battery anode materials are mainly graphite-based carbon materials, which are divided into artificial graphite and natural graphite, and the domestic market basically uses artificial graphite. In recent years, with the development of the market, many domestic battery manufacturers have introduced natural graphite, because it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393H01M4/04H01M4/133
CPCH01M4/1393H01M4/0404H01M4/133Y02E60/10
Inventor 吴卫卫裴志彬樊少娟
Owner 合肥国轩新材料科技有限公司
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