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Preparation method of high-safety ceramic coating separator

A technology with high safety and production method, which is applied in the production field of ceramic coating diaphragm, can solve the problems of reducing product yield, affecting grafting effect, and poor mechanical properties of coating diaphragm, so as to improve electrical conductivity and safety performance, The effect of reducing the possibility of burning or explosion and maintaining air permeability

Active Publication Date: 2017-07-14
DONGGUAN ADVANCED ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are a large number of hydroxyl groups on the surface of alkaline ceramics, which is a very polar inorganic compound with strong hydrophilicity and is easy to form agglomerates, making it compatible with polyolefin separators with a large difference in polarity. Poor capacity can easily lead to the phenomenon of "powder falling", which makes the mechanical properties of the coated separator poor, and the conventional alkaline ceramics are generally used in submicron order, with a specific surface area of ​​4-8m2 / g, which is very easy to absorb water and Dust impurities affect the safety performance of lithium batteries
Patent CN 102569700 A discloses a method for grafting and modifying inorganic ceramics. The sodium benzenesulfonate derivatives with active groups such as carboxyl groups on the benzene ring are selected to graft the ceramics, and then the grafted sulfonic acid SO3Li-containing ceramic functional micro-powder is obtained by ion exchange with SO3Li sodium salt, which has certain performance advantages in ceramic dispersion, but the steric hindrance of the grafted monomer is large, which affects the grafting effect, and ion exchange will reduce the product yield.
Patent CN 103956450 B discloses a composite diaphragm for lithium-ion batteries and its preparation method. The performance of the diaphragm is improved by grafting surfactants containing sulfonate or carboxylate on the ceramic surface, but the preparation process introduces a dehydrating agent Condensation reaction, the introduction of impurities increases the production cost of the product, although the low grafting effect caused by the large steric hindrance is improved, but the introduction of impurity sodium ions, and due to the presence of sulfonates or carboxylates, there is still a large Steric hindrance, resulting in a maximum grafting rate of 30% and low efficiency

Method used

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  • Preparation method of high-safety ceramic coating separator
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  • Preparation method of high-safety ceramic coating separator

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for manufacturing a high-safety ceramic-coated diaphragm, comprising the following steps:

[0025] 1) Preparation of modified basic ceramic powder: Mix 25g of hexylphosphoric acid and 1L of ethanol, stir evenly in a stirring tank, then add 500g of magnesium hydroxide powder, and stir for 0.5h under the condition of a rotating speed of 8000r / min to obtain Mix the solution, then raise the temperature of the mixed solution to 160°C-180°C, stir and react for 5h, after rinsing, filtering, and vacuum drying, the modified alkaline magnesium hydroxide powder is obtained;

[0026] 2) Preparation of modified ceramic slurry: 300 g of modified alkaline magnesium hydroxide powder prepared in step 1), 500 g of deionized water and 10 g of polyethyl acrylate were mixed and stirred for 1 hour to obtain modified ceramic slurry;

[0027] 3) Coating: The modified ceramic slurry prepared in step 2) is coated on one side of a polypropylene film with a thickness of 15 μm by screen pr...

Embodiment 2

[0029] A method for manufacturing a high-safety ceramic-coated diaphragm, comprising the following steps:

[0030] 1) Preparation of modified basic ceramic powder: mix 60g of dipentyl phosphoric acid and 1L of ethanol, stir evenly in a stirring tank, then add 500g of aluminum hydroxide powder, and stir for 1 hour under the condition of a rotating speed of 10000r / min. The mixed solution was obtained, and then the mixed solution was heated to 160°C-180°C, stirred and reacted for 8 hours, after rinsing, filtering, and vacuum drying, the modified basic aluminum hydroxide powder was obtained;

[0031] 2) Preparation of modified ceramic slurry: 300 g of modified alkaline aluminum hydroxide powder prepared in step 1), 500 g of deionized water and 10 g of polyvinyl alcohol were mixed and stirred for 1 hour to obtain modified ceramic slurry;

[0032] 3) Coating: Coat the modified ceramic slurry prepared in step 2) on one side of a polypropylene film with a thickness of 4 μm by gravure ...

Embodiment 3

[0034] A method for manufacturing a high-safety ceramic-coated diaphragm, comprising the following steps:

[0035] 1) Preparation of modified basic ceramic powder: mix 60g of 2-ethylhexyl phosphoric acid and 1L of ethanol, stir evenly in a stirring tank, then add 500g of boehmite powder, and stir for 1 hour under the condition of rotating speed of 10000r / min , to obtain a mixed solution, then raise the temperature of the mixed solution to 160°C-180°C, stir and react for 8h, after rinsing, filtering, and vacuum drying, a modified alkaline boehmite powder is obtained;

[0036] 2) Preparation of modified ceramic slurry: 300 g of the modified alkaline boehmite powder prepared in step 1), 500 g of deionized water and 10 g of polyacrylonitrile were mixed and stirred for 0.5 h to obtain a modified ceramic slurry;

[0037] 3) Coating: apply the modified ceramic slurry prepared in step 2) on one side of a polypropylene film with a thickness of 15 μm by scraping, and dry it for 3 minute...

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Abstract

The invention provides a preparation method of a high-safety ceramic coating separator. The preparation method comprises the following steps of 1) preparing modified alkali ceramic powder, in which short-carbon chain phosphoric acid and a solvent are uniformly mixed and stirred, alkali ceramic powder is added and uniformly stirred to obtain a mixed solution, a temperature is raised to 150-200 DEG C, stirring reaction is performed for 5-10 hours, and the modified alkali ceramic powder is obtained after performing rinsing, filtering and vacuum drying; 2) preparing modified ceramic paste, in which the modified alkali ceramic powder obtained by preparation of the step 1), deionized water and a binding agent are mixed and stirred for 0.5-3 hours to obtain the modified ceramic paste; and 3) coating, in which the modified ceramic paste obtained by preparation of the step 2) is coated at one side or two sides of a polyolefin-based film, a modified ceramic coating layer is formed after drying, and the high-safety ceramic coating separator is prepared. By the preparation method, the mechanical property of the separator is improved, the air permeability of the separator is maintained unchanged, the thermal stability of the alkali ceramic coating layer is maintained, and the conductivity and the safety performance of a lithium battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragm preparation, in particular to a method for manufacturing a high-safety ceramic coating diaphragm. Background technique [0002] As a new type of high-energy chemical power source, lithium-ion batteries, under the conditions of high temperature or high-efficiency charging and discharging, the thermal effect of the battery system will cause heat accumulation inside the battery, which can easily lead to thermal runaway and melting of the polyolefin diaphragm, causing large-area short circuits in the battery cell , thus causing the combustion and explosion of the lithium battery. Ceramic material is a kind of inorganic material with good heat resistance, and it is also the main means to solve the heat shrinkage problem of polyolefin diaphragm at present, such as a kind of ceramic diaphragm whose application number is CN 201410663119. Coating alumina ceramic layers on one or both sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/449H01M50/451H01M50/457H01M50/489
CPCH01M10/0525H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 周素霞王晓明杨浩田韦程
Owner DONGGUAN ADVANCED ELECTRONICS TECH
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