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Preparation method of composite diaphragm

A technology of composite diaphragm and porous diaphragm, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of difficulty in dispersion, easy agglomeration, and unsatisfactory product performance, and achieve the effect of convenient composite

Active Publication Date: 2016-06-01
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanomaterials have a large specific surface area, which is difficult to disperse and easily agglomerate, and it is difficult to form a uniform composite with the separator, which often leads to unsatisfactory product performance.

Method used

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  • Preparation method of composite diaphragm
  • Preparation method of composite diaphragm
  • Preparation method of composite diaphragm

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preparation example Construction

[0031] see figure 1 , the embodiment of the present invention provides a preparation method of a composite diaphragm, which includes the following steps:

[0032] (1) Preparation of nanometer single ion conductor dispersion;

[0033] (2) uniformly mixing the nano-single-ion conductor dispersion liquid with the polymer to prepare a coating solution; and

[0034] (3) Attaching the coating solution to the surface of the porous separator substrate.

[0035] This step (1) further includes:

[0036] S1, preparing a solution of nano sol by hydrolysis reaction, the nano sol is selected from at least one of titanium sol, aluminum sol, silica sol and zirconium sol, specifically comprising the following steps:

[0037] S11, dissolving at least one of the compounds of titanium, aluminum, silicon and zirconium that can undergo hydrolysis reactions in an organic solvent to form a first solution;

[0038] S12, mixing water and an organic solvent to form a second solution; and

[0039] S...

Embodiment 1

[0068] Mix 10 mL of tetrabutyl titanate with 50 mL of ethanol to form a first solution. Deionized water was mixed with 50 mL of ethanol to form a second solution. The molar ratio of deionized water to tetrabutyl titanate is 4:1. Slowly drop the second solution into the first solution for mixing, add concentrated nitric acid to adjust the pH to 3-4, stir and heat at 65°C for half an hour to obtain a titanium sol solution. Vinyltriethoxysilane was added to the titanium sol solution, and the temperature was raised to 80° C. for 1 hour under nitrogen protection to obtain a titanium sol solution grafted with C=C groups, adding MMA monomer and AA monomer, and Add the initiator benzoyl peroxide, and react at 80°C for 12 hours to obtain a solution of titanium dioxide nanosol-P(AA-MMA) complex. The solution of this titanium dioxide nano sol-P(AA-MMA) complex is placed in an autoclave, and heat-treated at 145° C. for 24 hours to obtain completely dehydroxylated crystalline nano TiO 2...

Embodiment 2

[0071] Same as Example 1, the only difference is that the mass percentage of the nano-single ion conductor in the coating layer of the composite separator is 10%.

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Abstract

The invention relates to a preparation method of a composite diaphragm, comprising (1) preparing a nano-single-ion conductor dispersion; (2) uniformly mixing the nano-single-ion conductor dispersion with a polymer to prepare a coating solution; and (3) preparing the nano-single-ion conductor dispersion The coating solution adheres to the surface of the porous membrane substrate. The nanometer single ion conductor dispersion liquid is obtained by adding oxide nanoparticle-P(AA-MMA) and lithium hydroxide into an organic solvent, mixing and heating.

Description

technical field [0001] The invention relates to a preparation method of a composite diaphragm. Background technique [0002] With the rapid development of lithium-ion batteries in new energy applications such as mobile phones, electric vehicles and energy storage systems, the safety of lithium-ion batteries is particularly important. Based on the analysis of the reasons for the safety of lithium-ion batteries, the safety of lithium-ion batteries can be improved from the following aspects: First, by optimizing the design and management of lithium-ion batteries, real-time monitoring and processing of the charging and discharging process of lithium-ion batteries , to ensure the safety of lithium-ion batteries, the second is to improve or develop new electrode materials to improve the intrinsic safety performance of the battery, and the third is to use a new type of safe electrolyte and diaphragm system to improve the safety performance of the battery. [0003] The separator is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/451H01M50/497
CPCH01M10/0525H01M50/403H01M50/446H01M50/451H01M50/497C08J2327/16C08J2427/16C08J7/0427Y02E60/10
Inventor 曹江何向明尚玉明王莉李建军张宏生高剑王要武罗晶刘榛
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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