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Viscoelastic raw material for battery pole piece, method for preparing raw material, and method for preparing pole piece

A battery pole piece and viscoelastic technology, which is applied to battery electrodes, electrode manufacturing, electrode rolling/calendering, etc., can solve the problems of low production efficiency, large amount of auxiliary materials, and small loading range, etc., so as to improve production efficiency, Increase the load range and ensure the effect of consistency

Active Publication Date: 2021-07-30
北京恩力动力技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems in the prior art that the active material loading range of battery pole pieces is small, the amount of auxiliary materials used is large, the production efficiency is low, and the consistency is poor, the invention provides a battery pole piece viscoelastic raw material, a raw material preparation method and a pole piece The preparation method, which reduces the amount of auxiliary materials and increases the loading range of the active material of the battery pole piece; the dry coating process prepares the battery pole piece, which not only has a high degree of automation, but also improves the production efficiency and the consistency of the pole piece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] Above-mentioned raw material is made viscoelastic raw material by following preparation method, and the steps are as follows,

[0050] Step 1. Put the battery electrode raw materials prepared in the above ratio into the mixer and mix them evenly; the speed of the mixer is set at 50rpm-1000rpm, and the mixing time is 2min-30min;

[0051] Step 2. Put the uniformly mixed raw materials into a kneader to add a solvent, and then knead them into agglomerates; knead the kneader at a speed of 10rpm-50rpm for 10min-60min; the solvent is N-methylpyrrolidone, acetone, ethanol, propanol, A mixture of one or more of ionized water, isopropanol, etc.

[0052] Step 3, kneading and adding the binder required for positive and negative electrode materials at the same time to make a viscoelastic raw material. The generated viscoelastic raw material has a solid content of 40%-80% and a viscoelasticity of 1000MPa-5000MPa.

[0053] Corresponding to the above-mentioned viscoelastic material u...

Embodiment approach

[0064] The specific implementation is as follows

[0065] (1) Preparation of raw materials: The weighing mass fraction is 5% lead powder and 60% lead sulfate, 30% conductive agent activated carbon and SP, 2% barium sulfate additive raw materials are put into high-speed mixer and mixed evenly, the speed of high mixer Set it to 300rpm, and the mixing time is 6min; put the uniformly mixed raw materials into the kneader, add a certain amount of deionized water, and knead at a speed of 36rpm for 30min; then add the required positive and negative materials Binder, polyethylene oxide with a mass ratio of 3%, kneaded at a speed of 18rpm for 10min to make a raw material with certain formability; the solid content is 60%, and the viscoelasticity is 3000MPa;

[0066] (2) Diaphragm preparation: With the aid of extruder equipment, the raw material is made into a diaphragm with a width of 230mm*thickness of 8mm;

[0067] (3) Electrode preparation: Coating machine parameter setting: primary...

Embodiment 2

[0069] Raw material preparation and diaphragm preparation are the same as S1; pole piece preparation: Coating machine parameter setting: primary pressure roll gap 0.72mm, roll speed 0.5m / min → secondary pressure roll gap 1.55mm, roll speed 0.4m / min, roll Temperature 25°C, oven temperature 150°C → three-time pressing roll gap 1.29mm, roll speed 3.2m / s; punch the flattened pole piece on a punching machine, and the pole piece size is 120mm long * 120mm wide * thick 1.45mm, of which, the loading capacity of the pole piece is 0.3g / cm 2 .

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Abstract

The invention discloses a viscoelastic raw material for a battery pole piece, a method for preparing the raw material and a preparation method for the pole piece, and belongs to the field of battery manufacturing. Through the unique design of viscoelastic raw materials with a solid content of 40%-80% and a viscoelasticity of 1000-5000MPa, the production and manufacture of thick film pole pieces. Through high-speed mixing of raw materials→kneading of raw materials after mixing→extrusion molding→diaphragm preparation→dry coating roll forming→electrode preparation and other processes, the automatic production of battery pole pieces is completed. Compared with the existing kneading and refining process, this scheme increases the loading range of the active material of the battery pole piece to 0.1-0.7g / cm 2 , Reduce the amount of auxiliary materials in the production; not only the degree of automation is high, but also the production efficiency and the consistency of the pole piece are improved.

Description

technical field [0001] The invention relates to the field of battery manufacturing, and more specifically relates to a viscoelastic raw material for a battery pole piece, a method for preparing the raw material, and a method for preparing the pole piece. Background technique [0002] So far, resource-based fossil fuels are still the main source of electricity supply for human beings. The carbon emission caused by its extensive use is the main cause of the current global greenhouse effect. As one of the important solutions, the development and utilization of renewable energy power generation represented by solar energy and wind energy has become a top priority. However, these natural energy sources including solar energy, wind energy, tidal energy, etc. are intermittent, and the amount of electric energy generated by them depends heavily on natural factors such as weather, season, time, and location. If these unstable electric energy is directly connected to the grid, it wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/57H01M4/58H01M4/62H01M10/36H01M4/04
CPCH01M4/0404H01M4/0435H01M4/362H01M4/57H01M4/5825H01M4/62H01M4/622H01M4/625H01M10/36H01M2004/021Y02E60/10
Inventor 丁波高桥勉李思文贤黄飞杨清宇陈飞曹翊车勇
Owner 北京恩力动力技术有限公司
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