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Electrode support type inorganic diaphragm and method for preparing same

An inorganic diaphragm and support type technology, applied in the direction of separator/film/diaphragm/spacer components, circuits, electrical components, etc., can solve problems such as poor strength, achieve strong mechanical strength, prevent puncture, and strong flexibility Effect

Inactive Publication Date: 2018-11-13
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention proposes an electrode-supported inorganic diaphragm and a preparation method thereof, aiming at solving the problem of poor mechanical strength of the existing inorganic diaphragm

Method used

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  • Electrode support type inorganic diaphragm and method for preparing same
  • Electrode support type inorganic diaphragm and method for preparing same
  • Electrode support type inorganic diaphragm and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Select three kinds of SiO with particle sizes of 100nm, 500nm and 1μm 2 A total of 0.6kg, the mass ratio of the three particle size materials is 4:4:2;

[0028] 2) Dissolve the above materials in 300g of water, stir and mix evenly at an appropriate speed in a vacuum mixer;

[0029] 3) 50g of polyvinyl alcohol (PVA) was dissolved in water, fully stirred to form a glue with a mass concentration of 6%; 15g of carboxymethyl cellulose (CMC) was dissolved in water, fully stirred to form a glue with a mass concentration of 2% glue;

[0030] 4) Take an appropriate amount of PVA and CMC glue and add it to SiO in uniform stirring 2 In the suspension, the amount of PVA added accounts for 8% by weight of the total solution;

[0031] 5) Stir the above slurry in a vacuum mixer at a speed of 600r / min for 8 hours to obtain a uniform and stable highly adhesive inorganic coating suspension;

[0032] 6) Under the conditions of a temperature of 80°C and an ambient humidity of 25%, u...

Embodiment 2

[0034] 1) Select three kinds of SiO with particle sizes of 100nm, 500nm and 1μm 2 A total of 0.7kg, the mass ratio of the three particle size materials is 3:3:1;

[0035] 2) Dissolve the above materials in 250g of water, stir and mix evenly at an appropriate speed in a vacuum mixer;

[0036] 3) Dissolve 10g of polyvinyl alcohol (PVA) in water, fully stir to form a glue with a mass concentration of 6%; dissolve 3g of carboxymethyl cellulose (CMC) in water, and fully stir to form a glue with a mass concentration of 2%. glue;

[0037] 4) Take an appropriate amount of PVA and CMC glue and add it to SiO in uniform stirring 2 In the suspension, the amount of PVA added accounts for 7% by weight of the total solution;

[0038] 5) Stir the above slurry in a vacuum mixer at a speed of 400r / min for 8 hours to obtain a uniform and stable highly adhesive inorganic coating suspension;

[0039]6) Under the conditions of a temperature of 40°C and an ambient humidity of 20%, use a coating ...

Embodiment 3

[0041] 1) Select three kinds of SiO with particle sizes of 100nm, 500nm and 1μm 2 A total of 0.6kg, the mass ratio of the three particle size materials is 1.5:1.5:1;

[0042] 2) Dissolve the above materials in 200g of water, stir and mix evenly at an appropriate speed in a vacuum mixer;

[0043] 3) Dissolve 8g of polyvinyl alcohol (PVA) in water, fully stir to form a glue solution with a mass concentration of 8%; dissolve 2g of carboxymethyl cellulose (CMC) in water, and fully stir to form a glue with a mass concentration of 3%. glue;

[0044] 4) Take an appropriate amount of PVA and CMC glue and add it to SiO in uniform stirring 2 In the suspension, the amount of PVA added accounts for 8% by weight of the total solution;

[0045] 5) Stir the above slurry in a vacuum mixer at a speed of 1000r / min, and stir for 4 hours to obtain a uniform and stable highly adhesive inorganic coating suspension;

[0046] 6) Under the conditions of a temperature of 60°C and an ambient humidit...

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Abstract

The invention provides an electrode support type inorganic diaphragm and a method for preparing the same. The electrode support type inorganic diaphragm comprises silicon oxide, solvents, binders anddispersing agents. The silicon oxide comprises silicon oxide particles, and the particle size distribution of the silicon oxide particles ranges from 100 nm to 1 micrometer. The electrode support typeinorganic diaphragm and the method have the advantages that the silicon oxide particles with different degrees of particle size distribution are dissolved in the solvents, then the binders and the dispersing agents are added into solution, accordingly, uniform and stable high-adhesiveness coated suspension slurry can be prepared and can be coated on pretreated electrode base materials to obtain electrode support type inorganic diaphragm coatings, and high binding force can be applied between the electrode support type inorganic diaphragm and electrode pole pieces; the electrode support type inorganic diaphragm is high in flexibility and mechanical strength, accordingly, lithium dendrites piercing can be effectively prevented, and the safety problems of existing electrode pole pieces due to the fact that inorganic diaphragms are destroyed in stress procedure can be solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrode-supported inorganic diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have always been considered as the battery with the most development potential due to their advantages such as high cell voltage, high energy density, high charge and discharge efficiency, and long cycle life. Lithium-ion batteries generally consist of a positive electrode, a negative electrode, an electrolyte, and a separator. The separator is an important part of the lithium-ion battery. It is a layer of porous film between the positive and negative electrodes of the battery. Free passage between the negative electrodes completes the transmission of lithium ions from the positive and negative electrodes during the charging and discharging process of the battery. [0003] The performance of the separator largely determines the safety of...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/409Y02E60/10
Inventor 穆居易金翼孙召琴徐彬王绥军胡晨黎可刘超群刘家亮吕刚尹秀娟丛琳李松
Owner CHINA ELECTRIC POWER RES INST
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