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Diaphragm containing organic-inorganic coating for lithium battery and preparation method of same

An inorganic coating and lithium battery technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of battery cycle performance and safety performance degradation, inorganic particles without mechanical strength, positive and negative electrode material corrosion damage, etc. , to achieve good rate and long-term cycle stability, improve the safety of the battery interface, and the effect of low cost

Pending Publication Date: 2019-11-22
XINXIANG ZHONGKE SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the heat resistance of lithium batteries, ceramic-coated polyolefin separators are currently used commercially, but ceramic coating technology has problems such as coating adhesion, ion conductivity, and poor mechanical properties (inorganic particles do not have mechanical strength, It is easy to drop powder in the electrolyte soaking), in addition, the ceramic coating film is more hydrophilic while being lyophilic, and the water content of the separator after coating increases from the water content of the base film (≤500ppm) to ≥2000ppm. In recent years, the more More and more battery manufacturers have put forward strict requirements on the moisture content, because excessive moisture can not only lead to the decomposition of lithium salt in the electrolyte, but also have a certain corrosion and damage effect on the positive and negative electrode materials and current collectors, and also reduce the internal resistance of the battery. The increase leads to the reduction of the cycle performance and safety performance of the battery

Method used

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  • Diaphragm containing organic-inorganic coating for lithium battery and preparation method of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) First weigh 100g of THF solvent into a 250mL beaker, then quickly weigh 2g of tea polyphenols into the above THF solvent, stir with a magnetic stirrer under heating at 60°C until the tea polyphenols are completely dissolved to prepare tea polyphenols / THF solution, add 25gAl to the above solution 2 O 3 Placed in an ultrasonic bath, there are no precipitated particles at the bottom of the inclined beaker;

[0031] (2) Then take 5g of cyclopentyl isocyanate and add it to the above mixture, and react with the hydroxyl and carboxyl groups on the ceramic surface for 3 hours under ultrasonic conditions to obtain the isocyanate-functionalized ceramic composite mixture, which is then washed with ethanol and dried by suction Obtain isocyanate functionalized ceramic composite;

[0032] (3) Weigh 100g of a mixed solvent of water and ethanol (water: ethanol = 1:1), disperse the prepared isocyanate-functionalized ceramic composite in the mixed solvent under ultrasonic conditio...

Embodiment 2

[0035] (1) First weigh 100g of NMP solvent in a 250mL beaker, then quickly weigh 1g of ferulic acid and add it to the above NMP solvent, stir with a magnetic stirrer under heating at 60°C until the ferulic acid is completely dissolved to prepare ferulic acid / NMP solution; add 20g SiO to the above solution 2 Placed in an ultrasonic bath, ultrasonic frequency 60HZ, under ultrasonic conditions until SiO 2 It is basically modified completely, and no precipitated particles can be seen at the bottom of the solution;

[0036] (2) Then take 2g of 3-thiophene isocyanate and add it to the above mixed solution, and react with the hydroxyl and carboxyl groups on the ceramic surface under ultrasonic conditions for 3 hours to obtain a mixed solution of isocyanate-functionalized ceramic composites, which is then washed with ethanol, suction filtered and dried to obtain Isocyanate functionalized ceramic composites;

[0037] (3) Weigh 100g of a mixed solvent of water and ethanol (water:ethan...

Embodiment 3

[0040] (1) First, weigh 100g of glycerol solvent in a 250mL beaker, then quickly weigh 15g of chlorogenic acid and add it to the above glycerin solvent, stir with a magnetic stirrer under heating at 60°C until the chlorogenic acid is completely dissolved to form a chlorogenic acid. / Glycerol solution; add 50g of titanium oxide to the above solution and place it in an ultrasonic bath, ultrasonic frequency 60HZ, under ultrasonic conditions until the titanium oxide is basically modified completely, and no precipitated particles can be seen at the bottom of the solution;

[0041] (2) Then take 20 g of vinyl isocyanate and add it to the above mixed solution, and react with the hydroxyl and carboxyl groups on the surface of titanium oxide under ultrasonic conditions for 3 hours to obtain a mixed solution of isocyanate-functionalized titanium oxide composite, which is then washed with ethanol Suction filtration and drying to obtain isocyanate functionalized titanium oxide composite; ...

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Abstract

The invention discloses a diaphragm containing an organic-inorganic coating for a lithium battery and a preparation method of the diaphragm. The preparation method comprises the following steps: treating ceramic particles with a plant phenolic acid compound, carrying out a cross-linking reaction on the treated ceramic particles and isocyanate to obtain a functionalized ceramic material, carrying out self-crosslinking on the functionalized ceramic material, polyphosphazene and derivatives thereof to form a polyphosphazene / functionalized ceramic composite coating, and treating with a surface glyceride compound to obtain the diaphragm coating. According to the invention, the organic-inorganic coating is introduced to one side or two sides of the polyolefin diaphragm, so that the adhesion strength, mechanical properties and ionic conductivity of the diaphragm coating are further improved on the premise of not influencing other properties, and the moisture content of the diaphragm is reduced; and furthermore, the electrochemical performance is improved, so that the performance requirements of the lithium ion battery diaphragm can be better met.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a separator for lithium batteries containing an organic-inorganic coating and a preparation method thereof. Background technique [0002] In recent years, on the one hand, the strong demand for high-performance secondary batteries from the 3C industry and the new energy automobile industry has promoted the development of diaphragm production technology. The separator is an important part of the core components of lithium-ion batteries. Its performance directly affects the working performance and service life of lithium-ion batteries. In the battery, the separator not only plays the role of conducting lithium ions, but also plays the role of isolating the positive and negative electrodes. [0003] In order to improve the heat resistance of lithium batteries, ceramic-coated polyolefin separators are currently used commercially, but ceramic coating technology...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 杨绍萍李军超郝福瑞王向东荆正军孔祥海杨丽灿张小雷王超君殷桥波李红娟
Owner XINXIANG ZHONGKE SCI&TECH
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