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Battery cathode slurry and preparation method of battery cathode slurry

A technology of battery negative electrode and negative electrode active material, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low compaction density of pole pieces, defects in cycle performance, and difficult dispersion of ingredients, so as to compensate for the decline in electrical conductivity, Improved flow properties and improved consistency

Inactive Publication Date: 2014-05-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simply using general carbon black is difficult to achieve the required performance, which is mainly reflected in the fact that the ingredients are not easy to disperse and the compaction density of the pole piece is low, so the battery using the prepared slurry still has defects in cycle performance and other aspects

Method used

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  • Battery cathode slurry and preparation method of battery cathode slurry
  • Battery cathode slurry and preparation method of battery cathode slurry
  • Battery cathode slurry and preparation method of battery cathode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Selection of negative electrode slurry components (parts by weight)

[0041]

[0042] Preparation of negative electrode slurry:

[0043] 1) Alloy treatment: add 100g of hydrogen storage alloy to potassium borohydride as a reducing agent and perform constant temperature treatment under hot alkali conditions to form a nickel-coated layer on the surface of the alloy.

[0044] 2) Preparation of binder: Weigh 0.7g of dry powder binder 1 in a beaker according to the proportion, stir evenly, and prepare a binder glue solution with a solid content of (2%-4%), and let it stand for later use.

[0045] 3) Preparation of auxiliary liquid: Mix 9.2g of conductive agent and 0.5g of antioxidant, add solvent and stir evenly, then add HPMC, stir with double planetary mixer, and prepare auxiliary liquid with solid content of 17%-19%. After stirring evenly, let it stand at room temperature for 12-15 hours and set aside.

[0046] 4) Slurry: Add the pretreated AB alloy powder, stir with...

Embodiment 2

[0048] Selection of negative electrode slurry components (parts by weight)

[0049]

[0050] Preparation of negative electrode slurry:

[0051] 1) Alloy treatment: add 100g of hydrogen storage alloy to sodium borohydride as a reducing agent and perform constant temperature treatment under hot alkali conditions to form a nickel-coated layer on the surface of the alloy.

[0052]2) Preparation of binder: Weigh 0.7g of dry powder hydrophilic binder hydroxypropyl methylcellulose (HPMC) and sodium polyacrylate in a beaker, stir evenly, and prepare a solid content of (2% -4%) adhesive glue solution 1, set aside for later use.

[0053] 3) Auxiliary liquid configuration: Mix 9.5g of conductive agent and 0.5g of antioxidant, add solvent and stir evenly, then add binder, stir with double planetary mixer, and prepare auxiliary liquid with solid content of 17%-19%. liquid. After stirring evenly, let it stand at room temperature for 12-15 hours and set aside.

[0054] 4) Slurry: add ...

Embodiment 3

[0056] Selection of negative electrode slurry components (parts by weight)

[0057]

[0058] Preparation of negative electrode slurry:

[0059] 1) Alloy treatment: Add 100g of hydrogen storage alloy to sodium hypophosphite as a reducing agent and perform constant temperature treatment under hot alkali conditions to form a nickel-coated layer on the surface of the alloy.

[0060] 2) Preparation of binder: Weigh 0.7g dry powder hydroxypropyl methylcellulose (HPMC) in a beaker according to the proportion, stir evenly, and prepare a binder glue with a solid content of (2%-4%) , set aside for later use.

[0061] 3) Auxiliary liquid configuration: Mix 6.95g of conductive agent and 0.5g of antioxidant, add solvent and stir evenly, then add binder 1, stir with double planetary mixer, and prepare a solid content of 17%-19% auxiliary liquid. After stirring evenly, let it stand at room temperature for 12-15 hours and set aside.

[0062] 4) Slurry: Add the pretreated alloy powder, ...

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Abstract

The invention relates to battery cathode slurry and a preparation method of the battery cathode slurry. The battery cathode slurry comprises cathode active material, a conductive agent, a bonding agent, an antioxidant and a solvent, wherein the ratio of parts by weight among the cathode active material, the conductive agent, the bonding agent and the antioxidant is 100:(3.2-10):(0.8-2.4):(0.1-1); the conductive agent, namely, carbon black comprises graphene-doped superconductive carbon black and nickel powder. The slurry preparation process comprises the following two steps in the slurry preparation process: firstly preparing auxiliary liquid, standing until the bubbles of the auxiliary liquid are removed as much as possible, and then highly mixing the auxiliary liquid with alloyed powder to produce the battery with excellent performances.

Description

technical field [0001] The invention relates to a power battery, in particular to a negative electrode slurry for a power battery for an electric vehicle and a preparation method thereof. Background technique [0002] With the characteristics of low carbon and environmental protection, electric vehicles are the future development direction of automobiles; with the development of electric vehicle technology, automobile manufacturers have increasingly urgent requirements for the performance improvement of power batteries used in electric vehicles. The consistency of power batteries for electric vehicles is the biggest bottleneck restricting the development of the entire electric vehicle technology. At present, the methods to solve the consistency of single battery mainly focus on the following methods: [0003] One is to use high-precision spraying technology to improve the consistency and filling of the battery pole pieces in the horizontal and vertical directions. [0004]...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/383H01M4/621H01M4/625H01M4/626Y02E60/10
Inventor 刘开宇李艳魏来刘洪涛桑商斌
Owner CENT SOUTH UNIV
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