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Preparation method of lithium battery diaphragm

A lithium battery diaphragm, an organic technology, applied in the field of lithium battery diaphragm preparation, can solve the problems of difficulty in preparing large-area membranes, high diaphragm cost, and poor uniformity, and achieve good promotion prospects, good stability, and heat resistance Good results

Active Publication Date: 2012-11-21
JIANGMEN LONGSHIJI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inorganic / organic composite diaphragm prepared by the above method has a certain mechanical strength and can withstand a certain pressure, but the cost of the diaphragm is high, the uniformity is not good, and it is difficult to prepare a large-area membrane, which greatly limits its application.

Method used

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  • Preparation method of lithium battery diaphragm
  • Preparation method of lithium battery diaphragm
  • Preparation method of lithium battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment relates to a preparation method of a lithium battery diaphragm, comprising the following steps:

[0027] (a) dissolving polyvinylidene fluoride in dimethylformamide to obtain polyvinylidene fluoride (4wt%) solution;

[0028] (b) Nano-Al 2 o 3 The powder is added in the product polyvinylidene fluoride (4wt%) solution obtained from the above step (a), and the nanometer Al 2 o 3 The weight ratio of powder to polyvinylidene fluoride is 2:1, mix evenly, heat at 50°C, heat for 1 hour, and ball mill to obtain nano-Al 2 o 3 A mixture of powder dispersed in polyvinylidene fluoride solution;

[0029] (c) the above-mentioned step (b) gained product nano-Al 2 o 3 The mixture of powder dispersed in polyvinylidene fluoride solution is poured on a stainless steel substrate, and the drying temperature is 80°C. After drying for 3 hours, the final product Al 2 o 3 / Polyvinylidene fluoride composite diaphragm.

[0030] Implementation effect: see Table 1 and Tabl...

Embodiment 2

[0032] This embodiment relates to a preparation method of a lithium battery diaphragm, comprising the following steps:

[0033] (a) dissolving polyvinylidene fluoride in dimethylformamide to obtain polyvinylidene fluoride (5wt%) solution;

[0034] (b) Nano-Al 2 o 3 Powder is added in the product polyvinylidene fluoride (5wt%) solution of above-mentioned step (a) gained, nanometer Al 2 o 3 The weight ratio of powder to polyvinylidene fluoride is 1:1, mix uniformly, heat at 60°C, heat for 1.5 hours, and ball mill to obtain nano-Al 2 o 3 A mixture of powder dispersed in polyvinylidene fluoride solution;

[0035] (c) the above-mentioned step (b) gained product nano-Al 2 o 3 The mixture of powder dispersed in polyvinylidene fluoride solution is poured on the silicon wafer substrate, and the drying temperature is 85 ° C. After drying for 3.5 hours, the final product Al 2 o 3 / Polyvinylidene fluoride composite diaphragm.

[0036] Implementation effect: see Table 1 and Tabl...

Embodiment 3

[0038] This embodiment relates to a preparation method of a lithium battery diaphragm, comprising the following steps:

[0039] (a) dissolving polyvinylidene fluoride in dimethylformamide to obtain polyvinylidene fluoride (6.7wt%) solution;

[0040] (b) Nano-Al 2 o 3 The powder is added in the product polyvinylidene fluoride (6.7wt%) solution obtained from the above step (a), and the nanometer Al 2 o 3 The weight ratio of powder to polyvinylidene fluoride is 1:2, mix evenly, heating temperature is 70°C, after heating for 2 hours, ball mill to get nano Al 2 o 3 A mixture of powder dispersed in polyvinylidene fluoride solution;

[0041] (c) the above-mentioned step (b) gained product nano-Al 2 o 3 The mixture of powder dispersed in polyvinylidene fluoride solution is poured on a glass substrate, and the drying temperature is 90 ° C. After drying for 4 hours, the final product Al 2 o 3 / Polyvinylidene fluoride composite diaphragm.

[0042] Implementation effect: see Ta...

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Abstract

The invention relates to a preparation method of a lithium battery diaphragm. The method comprises the following steps: 1, dissolving an organic polymer in an organic solvent to obtain an organic polymer solution; 2, adding an inorganic material to the organic polymer solution obtained in step 1, uniformly mixing, heating, and carrying out ball milling to obtain a mixture; and 3, casting the mixture obtained in step 2 on a substrate, and drying to obtain the final product inorganic / organic composite diaphragm. The method has the advantages of simple steps and low cost, and the prepared diaphragm has the advantages of porousness, flexibility, mechanical strength, good stability, good uniformity, and good heat resistance, has a good popularization prospect, and can be applied to the lithium ion battery field.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a preparation method of a lithium battery diaphragm. Background technique [0002] The separator material, known as the "third electrode" of the battery, occupies a very important position in the materials used to make the battery. Lithium-ion battery separator is a porous film that isolates the positive and negative electrodes, prevents internal short circuit of the battery, but allows ion flow to pass through quickly, thereby completing the rapid transmission of lithium ions between the positive and negative electrodes during electrochemical charging and discharging. At present, the cost of the separator accounts for about 1 / 3 of the cost of the entire lithium-ion battery. So far, polyethylene and polypropylene-based polyolefin separators have been routinely used, including single-layer PE, single-layer PP, and three-layer PP / PE / PP composite films. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 李海滨汪慧峰
Owner JIANGMEN LONGSHIJI TECH CO LTD
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