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Preparation process for water-based battery positive electrode slurry and pole pieces used for water-based battery

A battery cathode and preparation process technology, applied in electrode manufacturing, secondary battery, electrode current collector coating and other directions, can solve the problems of difficult recycling, high use cost, large ecological environment pollution, etc., and achieve environmentally friendly production and low cost. , the effect of simple process

Inactive Publication Date: 2021-04-02
浙江浙能中科储能科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The positive electrode material is one of the key factors determining the performance of the battery. At present, the most common positive electrode slurry for lithium batteries uses an oil-based system with NMP (N-methylpyrrolidone) as an organic solvent, and the preparation of water-based batteries is due to the electrolyte. Water, many water-based glues soaked in the electrolyte will dissipate and de-powder from the current collector; therefore, the slurry used in water-based batteries is mostly prepared from oil-based (NMP) systems. This solvent uses a large amount, is difficult to recycle, and uses high costs. It has great pollution to the ecological environment and has an impact on the health of production and operation workers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1, using a glue machine to produce a solid content of 3% thickener glue and 10% dispersant glue;

[0023] Step 2. Add conductive carbon powder with a mass fraction of 5% into the mixing tank and stir slowly to make it evenly mixed;

[0024] Step 3. Add the thickener and dispersant glue solution prepared in step 1 into the mixing tank according to the mass fraction of 1.1%, and mix evenly to obtain the mixed solution A;

[0025] Step 4: Add lithium manganate, the main material of the positive electrode with a mass fraction of 80%, into the mixed solution A twice, and stir evenly to obtain the mixed solution B. The stirring time is 60 minutes, the stirring speed is 55 r / min, and the dispersion speed is 3000 r / min ;

[0026] Step 5. Dilute the mixed solution B with deionized water to a solid content of 59% required for coating and stir evenly to obtain the mixed solution C;

[0027] Step 6. Add SBR with a mass fraction of 5% in the mixed solution C, and stir evenly ...

Embodiment 2

[0031] Step 1, using a glue making machine to produce a solid content of 2% thickener glue and 8% dispersant glue;

[0032] Step 2. Add conductive carbon powder with a mass fraction of 15% into the mixing tank and stir slowly to make it evenly mixed;

[0033] Step 3, adding the prepared thickener and dispersant glue into the mixing tank according to the mass fraction of 0.7%, and mixing evenly to obtain the mixed solution A;

[0034] Step 4. Add lithium manganate and 40% manganese dioxide with a mass fraction of 30% to the mixed solution A, and stir evenly to obtain mixed solution B. The stirring time is 60 minutes, the stirring speed is 55 r / min, and the dispersion speed is 3000r / min;

[0035] Step 5. Dilute the mixed solution B with deionized water to a solid content of 50% required for coating and stir evenly to obtain the mixed solution C;

[0036] Step 6. Add SBR and 2% PTFE with a mass fraction of 2% to the mixed solution C, and stir evenly to obtain the mixed solution...

Embodiment 3

[0040] Step 1, using a glue machine to produce a solid content of 1.5% thickener glue and 6% dispersant glue;

[0041] Step 2. Add conductive carbon powder with a mass fraction of 12% into the mixing tank and stir slowly to make it evenly mixed;

[0042] Step 3, adding the prepared thickener and dispersant glue into the mixing tank according to the mass fraction of 0.9%, and mixing evenly to obtain the mixed solution A;

[0043] Step 4, adding manganese dioxide with a mass fraction of 69% into the mixed solution A, stirring evenly to obtain the mixed solution B, the stirring time is 60min, the stirring speed is 55r / min, and the dispersion speed is 3000r / min;

[0044] Step 5. Dilute the mixed solution B with deionized water to a solid content of 52% required for coating and stir evenly to obtain the mixed solution C;

[0045] Step 6. Add SBR and 1.5% PTFE with a mass fraction of 2.5% to the mixed liquid C, and stir evenly to obtain the mixed liquid D. The stirring time is 60 m...

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Abstract

The invention relates to a preparation process for water-based battery positive electrode slurry and pole pieces used for a water-based battery. The preparation process comprises the following steps:preparing a glue solution with a specific solid content by using a glue making machine; uniformly mixing conductive carbon powder with a mass fraction of 2%-30% in a stirring tank; uniformly mixing the conductive carbon powder with the prepared glue solution having a mass fraction of 0.5%-1.5% in the stirring tank to obtain a mixed solution A. The preparation process for the water-based battery positive electrode slurry and pole piece used for the water-based battery has the beneficial effects that the positive electrode slurry adopts a water-based system taking deionized water as a base solution, the prepared slurry and the prepared pole pieces can be used for the water-based battery, the pole pieces are not dispersed and do not fall off after being soaked in water, the limitation of organic slurry on environmental humidity and pole piece drying gas emission is eliminated, and the process has the characteristics of simple process, environment-friendly production, low cost and the like; and therefore, the development of the water-based positive electrode slurry with excellent performance has very important practical significance.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a preparation process and method for water-based battery cathode slurry and pole pieces used in water-based zinc-based batteries. Background technique [0002] The positive electrode material is one of the key factors determining the performance of the battery. At present, the most common positive electrode slurry for lithium batteries uses an oil-based system with NMP (N-methylpyrrolidone) as an organic solvent, and the preparation of water-based batteries is due to the electrolyte. Water, many water-based glues soaked in the electrolyte will dissipate and de-powder from the current collector; therefore, the slurry used in water-based batteries is mostly prepared from oil-based (NMP) systems. This solvent uses a large amount, is difficult to recycle, and uses high costs. It pollutes the ecological environment greatly, and also has an impact on the health ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/36
CPCH01M4/04H01M4/0404H01M10/36Y02E60/10
Inventor 巴中银王玉弘迟晓伟李卓斌钱清宇马肖南
Owner 浙江浙能中科储能科技有限公司