Anode slurry and preparation method thereof, and application of anode slurry

A technology of negative electrode slurry and negative active material, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of increased shelf life, increased manufacturing and space costs, and reduced production efficiency

Inactive Publication Date: 2019-08-30
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, insufficient electrolyte infiltration will lead to the following problems: low battery capacity; lithium precipitation on the surface of the negative electrode sheet; decreased battery cycle performance, and even cycle diving; increased internal resistance of the battery
Pole pieces are easy to purify, which will lead to easy breakage during the preparation process, thereby reducing production efficiency and increasing production costs
[0003] At present, most of the existing preparation process

Method used

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  • Anode slurry and preparation method thereof, and application of anode slurry

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preparation example Construction

[0039] According to the method for preparing the negative electrode slurry according to the embodiment of the present invention, the negative electrode slurry is prepared by mixing the ceramic powder with the conductive agent, the negative electrode active material, the binder, and the solvent, so that the high-pressure negative electrode sheet prepared by using the negative electrode slurry has Strong liquid absorption and liquid retention, and can improve the electrolyte wettability of the high-pressure negative electrode sheet, and reduce the soaking time of the high-energy battery electrolyte. Further, the ceramic powder has low cost and low price, so that the cost of negative electrode slurry is relatively low.

[0040] It should be noted that the characteristics and advantages of the above-mentioned negative electrode slurry are also applicable to the above-mentioned method for preparing the negative electrode slurry, which will not be repeated here.

[0041] In yet anot...

Embodiment 1

[0045] The ceramic powder alumina with a particle size of 25 microns and the conductive agent SP are compacted to 1.65g / cm 2 The above carbon-coated 10% artificial graphite negative electrode active material, binder CMC and SBR, solvent water preparation, wherein, the mass ratio of SP to artificial graphite, CMC, SBR is 0.5:96.5:1.8:1.2, ceramic powder The content is 0.2% of the sum of the mass of the conductive agent, the negative electrode active material and the binder. First, mix and stir the ceramic powder and the conductive agent at a speed of 15 rpm for 35 minutes, then mix and stir the negative electrode active material and the aforementioned mixed powder containing the ceramic powder and the conductive agent at a speed of 15 rpm for 35 minutes, Then CMC, water and the mixed powder containing ceramic powder, conductive agent and negative electrode active material were mixed and stirred for 100 minutes at a revolution speed of 30 rpm and a rotation speed of 4500 rpm to ...

Embodiment 2

[0048] The ceramic powder alumina with a particle size of 25 microns and the conductive agent SP are compacted to 1.65g / cm 2 The above carbon-coated 10% artificial graphite negative electrode active material, binder CMC and SBR, and solvent water preparation, wherein the mass ratio of the conductive agent to the negative electrode active material, binder, and solvent is 0.5:96.5:1.8: 1.2. The content of the ceramic powder is 0.5% of the sum of the mass of the conductive agent, the negative electrode active material, the binder, and the solvent. The ceramic powder and the conductive agent were mixed and stirred at a speed of 15 rpm for 35 minutes, and then the negative electrode active material and the mixed powder containing the ceramic powder and the conductive agent were mixed and stirred for 35 minutes at a speed of 15 rpm, and then the CMC, water and the aforementioned mixed powder containing ceramic powder, conductive agent and negative electrode active material are mixed...

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Abstract

The invention discloses anode slurry and a preparation method thereof, and application of anode slurry. The anode slurry contains ceramic powder, a conductive agent, an anode active material, a binderand a solvent. Because the anode slurry contains ceramic powder, the conductive agent, the anode active material, the binder and the solvent, the high-compaction anode piece prepared by the anode slurry has high liquid absorption and retention, high electrolyte wettability and capability of reducing the soaking time of the high-energy battery electrolyte. Furthermore, the ceramic powder has low cost and low price, so that the cost of the anode slurry is relatively low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular, the invention relates to negative electrode slurry and its preparation method and application. Background technique [0002] High energy density lithium ion battery is the main development direction at present. In order to pursue high energy density, it is necessary to use high-pressure positive and negative electrode materials and high-pressure sheet production methods, but the high compaction of the electrode sheet will reduce the void space between the materials, which brings electrolyte infiltration. Problems such as difficulty and extreme ease. Among them, insufficient electrolyte infiltration will lead to the following problems: low battery capacity; lithium precipitation on the surface of the negative electrode sheet; decreased battery cycle performance, and even cycle diving; increased internal resistance of the battery. Pole pieces are easy to purify, which...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/583H01M4/13H01M10/0525
CPCH01M4/13H01M4/583H01M4/62H01M4/621H01M4/624H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 何里烈吕豪杰
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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