Battery diaphragm preparation process capable of increasing ion exchange capacity

A battery diaphragm and ion exchange technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of reducing the quality of the diaphragm, reducing the amount of ion exchange, increasing the internal resistance of the battery, etc., to improve ion exchange The effect of improving charge and discharge efficiency and reducing environmental pollution

Inactive Publication Date: 2020-12-25
湖南省凯纳方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The battery separator is generally made of polyethylene and polypropylene materials. In addition to separating the positive and negative electrodes, the battery separator also has the function of allowing ions to pass through contact with the electrolyte. Strong hydrophobicity is not conducive to the infiltration of the electrolyte, which increases the internal resistance of the battery, thereby reducing the ion exchange capacity and reducing the discharge efficiency of the battery. Therefore, it is necessary to modify the diaphragm. However, direct modification, the surface of the diaphragm Impurities and dust on the surface of the diaphragm will be adsorbed on the surface of the diaphragm, which will cause scratches on the diaphragm, and even cause the micropores on the surface of the battery diaphragm to be blocked, which greatly reduces the effect of modification. At the same time, after irradiation modification, the residual modifier adheres to the battery On the surface of the diaphragm, dust and particles in the air will also adhere to the surface of the diaphragm, reducing the quality of the diaphragm

Method used

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  • Battery diaphragm preparation process capable of increasing ion exchange capacity
  • Battery diaphragm preparation process capable of increasing ion exchange capacity

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] A preparation process of a battery separator for increasing ion exchange capacity, comprising the following steps: Step 1, raw material preparation; Step 2, melt extrusion; Step 3, heat treatment; Step 4, step-by-step stretching; Step 5, hot air setting; Step 6 , diaphragm cleaning; step seven, cutting and collecting; step eight, diaphragm modification; step nine, cleaning and drying;

[0033] Wherein in the above-mentioned step one, firstly, the required polypropylene and modifier are prepared, and the modifier consists of 10 parts by weight of acrylic acid, 60 parts of deionized water, 30 parts of acetone, 0.25 parts of Benzophenone, 0.05 part of lignosulfonate and 0.5 part of isomeric tridecanol polyoxyethylene ether are mixed;

[0034] In the above step two, the polypropylene prepared in step one is put into the twin-screw extruder, then the machine is turned on for heating, the polypropylene becomes molten, and then extruded from the die of the twin-screw extruder ...

Embodiment 2

[0043] A preparation process of a battery separator for increasing ion exchange capacity, comprising the following steps: Step 1, raw material preparation; Step 2, melt extrusion; Step 3, heat treatment; Step 4, step-by-step stretching; Step 5, hot air setting; Step 6 , diaphragm cleaning; step seven, cutting and collecting; step eight, diaphragm modification; step nine, cleaning and drying;

[0044] Wherein in above-mentioned step 1, at first the required polypropylene and modifying agent are prepared, modifying agent is by the weight part of 20 parts of acrylic acid, 65 parts of deionized water, 40 parts of acetone, 0.5 part of bismuth Benzophenone, 0.1 part of lignosulfonate and 0.8 part of isomeric tridecanol polyoxyethylene ether are mixed;

[0045] In the above step two, the polypropylene prepared in step one is put into the twin-screw extruder, then the machine is turned on for heating, the polypropylene becomes molten, and then extruded from the die of the twin-screw e...

Embodiment 3

[0054] A preparation process of a battery separator for increasing ion exchange capacity, comprising the following steps: Step 1, raw material preparation; Step 2, melt extrusion; Step 3, heat treatment; Step 4, step-by-step stretching; Step 5, hot air setting; Step 6 , diaphragm cleaning; step seven, cutting and collecting; step eight, diaphragm modification; step nine, cleaning and drying;

[0055] Wherein in the above-mentioned step one, firstly, the required polypropylene and modifier are prepared, and the modifier consists of 15 parts by weight of acrylic acid, 62 parts of deionized water, 35 parts of acetone, 0.45 parts of Benzophenone, 0.6 part of lignosulfonate and 0.75 part of isomeric tridecanol polyoxyethylene ether are mixed;

[0056] In the above step two, the polypropylene prepared in step one is put into the twin-screw extruder, then the machine is turned on for heating, the polypropylene becomes molten, and then extruded from the die of the twin-screw extruder ...

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Abstract

The invention discloses a battery diaphragm preparation process capable of increasing ion exchange capacity. The battery diaphragm preparation process comprises the steps of step 1, preparing raw materials; step 2, conducting melt extrusion; step 3, performing heat treatment; step 4, stretching step by step; step 5, conducting hot air shaping; step 6, conducting diaphragm cleaning; step 7, slitting and collecting; step 8, conducting diaphragm modification; and step 9, cleaning and drying. According to the invention, the diaphragm is modified through a modifier, and the hydrophilicity of the diaphragm is improved. Meanwhile, lignosulfonate is added into the modifier, the ion exchange capacity of the diaphragm is improved, the charging and discharging efficiency of a battery is improved, dust and particles on the surface of the diaphragm are brushed away through a brush, and the diaphragm is prevented from being scratched by the dust and the particles. The influence of particles and duston the modification effect is reduced at the same time, the modified diaphragm is soaked with a potassium hydroxide solution and washed with pure water multiple times, the unreacted modifier and particles on the surface of the diaphragm are removed, and the quality of the diaphragm is improved.

Description

technical field [0001] The invention relates to the technical field of diaphragm preparation, in particular to a preparation process for a battery diaphragm that increases ion exchange capacity. Background technique [0002] In the structure of a lithium battery, the diaphragm is one of the key inner components. The main function of the diaphragm is to separate the positive and negative electrodes of the battery to prevent the two electrodes from contacting and short circuit. In addition, it also has the function of allowing electrolyte ions to pass through. The material is non-conductive, and its physical and chemical properties have a great influence on the performance of the battery. Different types of batteries require different separators. For lithium battery series, since the electrolyte is an organic solvent system, a separator material that is resistant to organic solvents is required. [0003] The battery separator is generally made of polyethylene and polypropylen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052B08B1/00B08B5/04
CPCH01M10/052B08B1/002B08B5/04Y02E60/10
Inventor 夏祥华何志能叶义林
Owner 湖南省凯纳方科技有限公司
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