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Preparation method of lithium-ion battery diaphragm

A technology for lithium-ion batteries and diaphragms, which is applied in the field of preparation of lithium-ion battery diaphragms, and can solve the problems of reducing the safety performance of batteries, low ion conductivity and porosity, and limiting the energy performance of lithium-ion batteries.

Inactive Publication Date: 2018-11-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyolefin is a non-polar material with low ionic conductivity and porosity, which limits the energy performance of lithium-ion batteries. In addition, due to the shrinkage of polyolefin separators at higher temperatures, it reduces Battery safety performance

Method used

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  • Preparation method of lithium-ion battery diaphragm
  • Preparation method of lithium-ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of a lithium-ion battery separator, specifically comprising the following steps:

[0022] (1) Place 20g of cellulose in a mixed solution of 40g of dimethylformamide (DMF) and 60g of 1,2-dichloromethane (DCM), and use a cell crusher to crush it into a uniformly mixed dispersion ;

[0023] (2) Add 30g of polyethylene and 20g of chloromethylated polyether ether ketone to the above dispersion, stir and mix well, add 5g of glycerol, place on a constant temperature workbench at 80°C, and stir at constant temperature for 3 hours into a homogeneous solution;

[0024] (3), above-mentioned solution is spun into film by electrospinning equipment, wherein the volume of syringe is 10ml, and the diameter of spinneret is 0.5mm, and spinning speed is 0.05ml / min, stops spinning after 30mins;

[0025] (4) Roll the above-mentioned film under a pressure of 30MP, and then place it in an oven for drying to obtain a lithium-ion battery separator.

Embodiment 2

[0027] A preparation method of a lithium-ion battery separator, specifically comprising the following steps:

[0028] (1), 50g cellulose is placed in the DMF of 40g and the DCM mixed solution of 100g, it is smashed into the dispersion liquid that mixes evenly with cell pulverizer;

[0029] (2) Add 40g of polyethylene and 20g of chloromethylated polyether ether ketone to the above dispersion, stir and mix well, add 3g of glycerol, place on a constant temperature workbench at 80°C, and stir at constant temperature for 3 hours into a homogeneous solution;

[0030] (3), above-mentioned solution is spun into film by electrospinning equipment, wherein the volume of syringe is 10ml, and the diameter of spinneret is 0.5mm, and spinning speed is 0.05ml / min, stops spinning after 30mins;

[0031] (4) Roll the above-mentioned film under a pressure of 30MP, and then place it in an oven for drying to obtain a lithium-ion battery separator.

Embodiment 3

[0033] A preparation method of a lithium-ion battery separator, specifically comprising the following steps:

[0034] (1), 60g cellulose is placed in the DMF of 40g and the DCM mixed solution of 100g, it is smashed into the dispersion liquid that mixes evenly with cell pulverizer;

[0035] (2) Add 50g of polyethylene and 60g of chloromethylated polyether ether ketone to the above dispersion, stir and mix well, add 10g of glycerol, place on a constant temperature workbench at 80°C, and stir at constant temperature for 3 hours into a homogeneous solution;

[0036] (3), above-mentioned solution is spun into film by electrospinning equipment, wherein the volume of syringe is 10ml, and the diameter of spinneret is 0.5mm, and spinning speed is 0.05ml / min, stops spinning after 30mins;

[0037] (4) Roll the above-mentioned film under a pressure of 30MP, and then place it in an oven for drying to obtain a lithium-ion battery separator.

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Abstract

The invention discloses a preparation method of a lithium-ion battery diaphragm. The preparation method comprises the following steps: adding cellulose into a mixed solution of dimethylformamide and 1,2-dichloromethane, smashing, and mixing, so as to obtain uniform dispersion liquid; adding polyethylene and chloromethylated polyether-ether-ketone into the dispersion liquid, uniformly stirring andmixing, adding a proper amount of a pore-forming agent, putting the liquid on a constant-temperature working table, and carrying out constant-temperature stirring, so as to obtain a uniform solution;preparing a film from the solution through the spinning of electrostatic spinning equipment; and carrying out roll pressing on the film, putting the film into a drying oven, and drying, so as to obtain the lithium-ion battery diaphragm. According to the preparation method, by utilizing cellulose and chloromethylated polyether-ether-ketone, the thermal stability and electrochemical stability of theprepared lithium-ion battery diaphragm are improved.

Description

technical field [0001] The invention relates to the field of lithium ion manufacturing, in particular to a preparation method of a lithium ion battery diaphragm. Background technique [0002] With the development of social economy, people's requirements for energy storage devices are getting higher and higher. Lithium-ion batteries are widely used in portable storage devices and new energy vehicles due to their high specific capacity and long cycle life. An important part of the direct contact with the negative electrode is an important material that determines the performance of the lithium-ion battery. [0003] At present, polyolefin materials such as polyethylene and polypropylene are widely used in lithium-ion batteries because of their high mechanical strength and good electrochemical performance. However, polyolefin is a non-polar material with low ionic conductivity and porosity, which limits the energy performance of lithium-ion batteries. In addition, due to the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/44Y02E60/10
Inventor 柳盼盼陈萌
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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