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A preparation process of inorganic diaphragm based on mesoporous material

A technology of mesoporous material and inorganic diaphragm, applied in the field of inorganic diaphragm preparation technology, can solve problems such as poor battery energy density, achieve high safety, avoid poor mechanical properties of diaphragm, and avoid membrane brittleness.

Pending Publication Date: 2019-01-18
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention proposes a preparation process of an inorganic diaphragm based on mesoporous materials, aiming at solving the problem in the prior art that the battery energy density is poor due to the different densities of the materials used to prepare the diaphragm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Select SiO with a particle size of 500nm and 1μm 2 A total of 1000g, wherein the mass ratio of the two particle size materials is 1:1; select 50g of the mixed powder of MCM-41 molecular sieve and MCM-48 molecular sieve with a mass ratio of 2:1, wherein MCM-41 molecular sieve and MCM- The pore diameters of 48 molecular sieves are 2nm and 4nm respectively;

[0023] 2) Dissolve the above materials in 400g of water, stir and mix at an appropriate speed in a vacuum mixer to obtain a suspension;

[0024] 3) Dissolve an appropriate amount of polyvinyl alcohol (PVA) in water, fully stir to configure a glue solution with a mass concentration of 4%; dissolve an appropriate amount of carboxymethyl cellulose (CMC) in water, and fully stir to configure a mass concentration of 3%. glue;

[0025] 4) Take an appropriate amount of PVA and CMC glue and add it to the suspension in uniform stirring to obtain an inorganic coating slurry, wherein the amount of PVA added accounts for 8% ...

Embodiment 2

[0029] 1) Select SiO with a particle size of 500nm and 1μm 2 A total of 970g, wherein the mass ratio of the two particle size materials is 1:2; select 30g of the mixed powder of MCM-41 molecular sieve and MCM-48 molecular sieve with a mass ratio of 2:1, wherein MCM-41 molecular sieve and MCM- The pore diameters of 48 molecular sieves are 4nm and 4nm respectively;

[0030] 2) Dissolve the above materials in 350g of water, stir and mix at an appropriate speed in a vacuum mixer to obtain a suspension;

[0031] 3) Dissolve an appropriate amount of polyvinyl alcohol (PVA) in water, fully stir to configure a glue solution with a mass concentration of 6%; dissolve an appropriate amount of carboxymethyl cellulose (CMC) in water, and fully stir to configure a mass concentration of 3%. glue;

[0032] 4) Take an appropriate amount of PVA and CMC glue and add it to the suspension in uniform stirring to obtain an inorganic coating slurry, wherein the amount of PVA added accounts for 8% b...

Embodiment 3

[0036] 1) Select SiO with a particle size of 500nm and 1μm 2A total of 950g, wherein the mass ratio of the two particle size materials is 1:1; select 50g of the mixed powder of MCM-41 molecular sieve and MCM-48 molecular sieve with a mass ratio of 3:1, wherein MCM-41 molecular sieve and MCM- The pore diameters of 48 molecular sieves are 2nm and 3nm respectively;

[0037] 2) Dissolve the above materials in 400g of water, stir and mix at an appropriate speed in a vacuum mixer to obtain a suspension;

[0038] 3) Dissolve an appropriate amount of polyvinyl alcohol (PVA) in water, fully stir to configure a glue solution with a mass concentration of 5%; dissolve an appropriate amount of carboxymethyl cellulose (CMC) in water, and fully stir to configure a mass concentration of 2%. glue;

[0039] 4) Take an appropriate amount of PVA and CMC glue and add it to the suspension in uniform stirring to obtain an inorganic coating slurry, wherein the amount of PVA added accounts for 5% by...

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Abstract

The invention provides a preparation process of an inorganic diaphragm based on mesoporous material, which comprises the following steps of: dissolving silicon oxide and mesoporous material in a preset mass ratio in a solvent and uniformly stirring to obtain a suspension; adding a suitable amount of bind and dispersant into that suspension, and performing fully stirring at a preset stirring speedto obtain the inorganic coat slurry; coating a surface of that battery substrate with the inorganic coating slurry, and performing drying at a preset temperature for a period of time to prepare an electrode-supported inorganic diaphragm. The invention combines ceramic powder with mesoporous molecular sieve to prepare diaphragm slurry, which not only ensures high safety of inorganic diaphragm, butalso avoids defects of brittleness and polycrystallinity of diaphragm, and is beneficial to improving liquid-retaining capacity of diaphragm and energy density of battery. The synthesized diaphragm has the characteristics of ultra-light, good adhesion with the substrate, and good flexibility, can effectively avoid the problem that the mechanical properties of the diaphragm become worse when the inorganic diaphragm is made of a single ceramic material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragms, in particular to a preparation process for inorganic diaphragms based on mesoporous materials. Background technique [0002] The separator is an important part of the lithium-ion battery. The safety of the lithium-ion battery largely depends on the performance of the separator. At present, the widely used organic separator has the disadvantages of poor heat resistance, easy to be pierced by lithium dendrites, and short circuit. Directly endanger the safety performance of lithium-ion batteries. On the other hand, the hydrophobic characteristics of the organic separator lead to poor wetting performance of the electrolyte, which affects the rate performance of the battery. Therefore, inorganic separators have become the focus of attention. [0003] Inorganic membranes are made of inorganic materials and have many advantages that organic membranes do not have. Inorganic mate...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/449H01M50/489H01M50/491H01M50/497
CPCH01M10/0525H01M50/431H01M50/403Y02E60/10
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李松尹秀娟丛琳
Owner CHINA ELECTRIC POWER RES INST
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