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Method of manufacturing diaphragm used for high security lithium ion secondary battery

A secondary battery, high-safety technology, used in battery pack parts, circuits, electrical components, etc., can solve problems such as uncontrollable violent chemical reactions, and achieve excellent safety performance, good cycle performance, and maintain the effect of cycle performance.

Inactive Publication Date: 2009-02-18
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for the safety problem of lithium batteries is the short contact between the positive electrode and the negative electrode, which leads to uncontrollable violent chemical reactions.

Method used

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  • Method of manufacturing diaphragm used for high security lithium ion secondary battery
  • Method of manufacturing diaphragm used for high security lithium ion secondary battery
  • Method of manufacturing diaphragm used for high security lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The diaphragm substrate adopts celgard2320 20μm diaphragm, and the surface tension of the diaphragm reaches 40 dynes through surface corona treatment;

[0028] Preparation of inorganic ceramic glue for diaphragm coating:

[0029] The composition of the inorganic ceramic glue is as follows: 42 parts of Al2O3 powder (primary particle size 15nm, modified by organosilicon coupling agent) whose surface has been modified by lipophilic dispersion stabilizer, 20 parts of methyl acrylate polymerized monomer, Oil-soluble initiator: di-tert-butyl peroxy idiobutyrate, its addition amount is 0.4% of polymerized monomers; 18 parts of cyclohexane solvent.

[0030] Preparation steps:

[0031] 1) Mix 20kg of the above-mentioned polymerized monomers and organic solvents, and stir evenly, using ordinary paddle-type stirring blades, and the stirring tank is 60L;

[0032] 2) Add 22.1 kg of the above-mentioned aluminum oxide powder, first use a common high-speed turbine mixer to stir for 1...

Embodiment 2

[0037] The diaphragm substrate adopts Tonen 20μm diaphragm, and the surface tension of the diaphragm reaches 38 dynes through surface corona treatment;

[0038] Preparation of inorganic ceramic glue for diaphragm coating:

[0039] The composition of inorganic ceramic glue is as follows: 45 parts of silicon dioxide powder (primary particle size 23nm, modified with organic boric acid coupling agent) whose surface has been modified by lipophilic dispersion stabilizer, 25 parts of acrylonitrile polymerized monomer, oil-soluble Initiator: di-tert-butyl peroxyspecific butyrate, the addition amount is 0.8% of the polymerized monomer; 30 parts of tetrahydrofuran solvent.

[0040] Preparation steps:

[0041] 1) Mix 30kg of the above-mentioned polymerized monomers and organic solvent, and stir evenly, using ordinary paddle-type stirring blades, and the stirring tank is 80L;

[0042] 2) Add 24.5kg of the above-mentioned silicon dioxide powder, first use a common high-speed turbine mixe...

Embodiment 3

[0048] The diaphragm substrate adopts celgard2320 20μm diaphragm, and the surface tension of the diaphragm reaches 40 dynes through surface corona treatment;

[0049] Preparation of inorganic ceramic glue for diaphragm coating:

[0050] The composition of the inorganic ceramic glue is as follows: 32 parts of Al2O3 powder (primary particle size 15nm, modified by organic silicon coupling agent) whose surface has been modified by lipophilic dispersion stabilizer, 10 parts of methyl acrylate polymerized monomer, Oil-soluble initiator, di-tert-butyl peroxy idiobutyrate, its addition amount is 0.4% of polymerized monomer; 20 parts of cyclohexane solvent.

[0051] Preparation steps:

[0052] 1) Mix 20kg of the above-mentioned polymerized monomers and organic solvent, and stir evenly, using ordinary paddle-type stirring blades, and the stirring tank is 60L;

[0053] 2) Add 21.4 kg of the above-mentioned aluminum oxide powder, firstly use an ordinary high-speed turbine mixer to stir ...

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Abstract

The invention discloses a membrane preparation method of lithium ion secondary battery safety characteristic having better puncture-resistant and heat-resistant characteristics. The method of the invention includes: firstly preprocessing the membrane surface; then preparing inorganic ceramic coarse glue comprising: 30-50 parts of modified inorganic ceramic powder by a lipophilic dispersion stabilizer at the surface, the original grain diameter of the inorganic ceramic powder being 10-300 nm; 5-20 parts of polymonomer; 0.3-1.5% oil-soluble initiator with the addition of the polymonomers, the initiating half period of the oil-soluble initiator being less than 2h at the temperature of 60 degrees centigrade; 20-35 parts of organic solvent; lastly coating at the surface of base material to form a double-face coating structure. The preparation method provided by the invention smartly combines the coat drying process at the membrane surface with the polyreaction such that the liquid membrane made of inorganic ceramic coarse glue at the surface of the base is solidified due to the polyreaction by means of a further drying process.

Description

technical field [0001] The invention relates to a diaphragm for a lithium-ion secondary rechargeable battery, in particular to a preparation method for a high-safety diaphragm for a lithium-ion secondary battery. Background technique [0002] With the development of IT electronics industry and network traffic, lithium-ion secondary power supply is showing a vigorous development trend, and the demand for lithium-ion secondary batteries will maintain a growth trend of more than 15% in the next few years. However, with the rapid development of lithium-ion batteries and the expansion of application fields, lithium-ion secondary battery safety accidents occur frequently, ranging from battery heating to igniting transport aircraft. At present, the global attention to lithium batteries has completely shifted to safety, and even this directly determines the life and death of lithium batteries in the future. The main reason for the safety problem of lithium batteries is the short co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M50/40H01M50/403
CPCY02E60/10
Inventor 王玉来
Owner TIANJIN LISHEN BATTERY
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