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Diaphragm for efficient lithium ion secondary battery and preparation method thereof

A secondary battery, lithium ion technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problem of incompleteness guarantee, improve the liquid absorption rate and liquid retention capacity of the diaphragm, and improve the affinity , the effect of reducing the risk of explosion

Active Publication Date: 2020-06-26
四川优源新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diaphragm has the following defects: because the invention patent improves the safety performance of the battery by increasing the thermal shrinkage rupture temperature, and because it does not involve the flame retardancy of the diaphragm, the completeness of the invention is improved to a certain extent , but this does not guarantee completeness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method of separator for high-efficiency lithium-ion secondary battery is:

[0024] S1. Preparation of silicone resin: at room temperature, mix 100 g of methylphenyldichlorosilane and 100 g of toluene evenly, and then slowly add 50 g of dilute hydrochloric acid with a concentration of 0.1% to the mixing system. After the addition of hydrochloric acid is completed, Reflux reaction for 3 hours, after the reflux reaction, lower the temperature to 60°C, add an appropriate amount of hexamethyldisilazane to react for 10 minutes, to neutralize the remaining hydrochloric acid, then raise the temperature to 110°C to concentrate to obtain a resin solution, remove the solvent and water, and obtain Silicone resin with moisture content in the range of 0.5-1%;

[0025] S2. Prepare modified activated carbon: use hydrogen peroxide to modify the nano activated carbon, the treatment time is 30min, and dry at room temperature after the treatment is completed;

[0026...

Embodiment 2

[0029] A kind of preparation method of separator for high-efficiency lithium-ion secondary battery is:

[0030] S1. Preparation of silicone resin: at room temperature, mix 100 g of methylphenyldichlorosilane and 150 g of toluene evenly, then slowly add 30 g of dilute hydrochloric acid with a concentration of 0.2% to the mixing system, and after the addition of hydrochloric acid is completed, Reflux reaction for 3 hours, after the reflux reaction, lower the temperature to 60°C, add an appropriate amount of hexamethyldisilazane to react for 10 minutes to neutralize the remaining hydrochloric acid, then raise the temperature to 115°C to concentrate to obtain a resin solution, remove the solvent and water, and obtain Silicone resin with moisture content in the range of 0.5-1%;

[0031] S2. Prepare modified activated carbon: use hydrogen peroxide to modify the nano activated carbon, the treatment time is 30min, and dry at room temperature after the treatment is completed;

[0032]...

Embodiment 3

[0035] A kind of preparation method of separator for high-efficiency lithium-ion secondary battery is:

[0036] S1. Preparation of silicone resin: at room temperature, mix 100 g of methylphenyldichlorosilane and 120 g of toluene evenly, and then slowly add 40 g of dilute hydrochloric acid with a concentration of 0.15% into the mixing system. After the addition of hydrochloric acid is completed, Reflux reaction for 3 hours, after the reflux reaction, lower the temperature to 60°C, add an appropriate amount of hexamethyldisilazane for 10 minutes to neutralize the remaining hydrochloric acid, then heat up to 120°C to concentrate to obtain a resin solution, remove the solvent and water, Obtain a silicone resin with a moisture content in the range of 0.5-1%;

[0037] S2. Prepare modified activated carbon: use hydrogen peroxide to modify the nano activated carbon, the treatment time is 30min, and dry at room temperature after the treatment is completed;

[0038] S3. Preparation of ...

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Abstract

The invention discloses a diaphragm for an efficient lithium ion secondary battery. The diaphragm comprises polyethylene microporous layers and a composite material coating. The thickness of each polyethylene microporous layer is 5-10 [mu]m, the pore diameter is 0.03-0.12 [mu]m, and the porosity is 40-50%. The thickness of each composite material coating is 5-10 [mu]m. The material coating comprises the following raw materials in parts by weight: 90-95 parts of organic silicon resin, 5-10 parts of modified activated carbon and 20-30 parts of a curing agent, wherein the water content of the organic silicon resin is 0.5-1%, the modified activated carbon is modified activated carbon obtained by surface oxidation, and the modified activated carbon is nano modified activated carbon. The diaphragm comprises the polyethylene microporous layers and the composite material coating, and is specifically of a polyethylene-composite material-polyethylene layered structure, and organic silicon resinin the composite material layer has good flame retardance, so that the explosion risk of the battery is reduced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a high-efficiency lithium ion battery diaphragm and a preparation method thereof. Background technique [0002] The separator is one of the most critical inner components in the structure of the lithium battery. Its main function is to separate the positive and negative electrodes, prevent the battery from short-circuiting, and at the same time ensure the normal passage of ions during charging and discharging to ensure the normal operation of the battery. The quality of its performance directly affects the capacity, rate, life and safety of the battery. [0003] The Chinese invention patent with the application number CN201510093339.5 discloses a polyethylene microporous diaphragm containing an organic / inorganic composite cross-linked coating and its preparation method. The invention uses aromatic heterocyclic polyester diols and aromatic isocyanates as The basic...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 喻国强刁玉龙
Owner 四川优源新能源有限公司