Preparation method of modified diaphragm for lithium-ion secondary battery as well as product and preparation device thereof

A secondary battery and lithium-ion technology, applied in the direction of layered products, battery pack parts, chemical instruments and methods, etc., can solve the problems of inability to truly replace microporous membranes, poor mechanical strength of diaphragms, and potential safety hazards, and achieve suitable Large-scale industrial production, improving environmental protection, and increasing the effect of consistency

Active Publication Date: 2011-10-19
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its melting point is higher than 250°C, and it has relatively good low-temperature performance. However, the mechanical strength of this kind of diaphragm is poor, and it is easy to break during the assembly process, causing safety hazards. It has not yet been used on a large scale.
[0009] The separators made by the above methods have their own defects, and cannot really replace the existing PP-PE system microporous membranes to achieve large-scale mass production

Method used

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  • Preparation method of modified diaphragm for lithium-ion secondary battery as well as product and preparation device thereof
  • Preparation method of modified diaphragm for lithium-ion secondary battery as well as product and preparation device thereof
  • Preparation method of modified diaphragm for lithium-ion secondary battery as well as product and preparation device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The first step is to select a single-layer PP diaphragm as the base film with a thickness of 22 microns, and install the base film on the base film conveying section;

[0044] In the second step, put 190 grams of high-purity polybismaleimide (special fiber) in 800 grams of DMAC (N, N-dimethylacetamide), then add 10 grams of LiCl as a co-solvent, and stir through a high-speed stirring disperser After 10 hours, a composite mixed solution was obtained;

[0045] The third step is to heat the composite mixed solution to the spinning temperature of 85°C, at which time a liquid crystal solution is formed, put the composite mixed solution into the spinneret of the electrospinning device, and spray the composite mixed solution evenly on the substrate through high-speed multi-nozzles. On the membrane, a primary composite membrane is formed;

[0046] The fourth step: the primary composite film enters the drying and solvent recovery device, and the air duct of the drying and solve...

Embodiment 2

[0049] The first step is to select three layers of PP / PE / PP diaphragm as the base film, the thickness of the base film is 25 microns, and install the base film on the base film conveying section;

[0050] In the second step, 200 grams of polytetrafluoroethylene is placed in 1000 grams of N-methylpyrrolidone, and then 100 grams of sodium benzoate is added as a cosolvent. After stirring at high speed for 3 hours, 900 grams of high-purity alumina powder is then added, passed through a high-speed The stirring disperser was stirred for 5 hours to obtain a composite mixture;

[0051] The third step is to heat the composite mixture to the spinning temperature of 95°C, put the composite mixture into the spinneret of the electrospinning device, and spray the composite mixture evenly on the base film through high-speed multi-nozzles to form a primary composite membrane;

[0052] The fourth step: the primary composite film enters the drying and solvent recovery device, and the air duct ...

Embodiment 3

[0055] The first step is to select a single-layer PE diaphragm as the base film with a thickness of 21.6 microns, and install the base film on the base film conveying section;

[0056] The second step is to place 90 grams of polyvinylidene fluoride in 1000 grams of N-methylpyrrolidone / methanol (1:1 mass ratio) mixed solvent, and then add 50 grams of CaCl 2 As a co-solvent, after 2 hours of high-speed stirring, 900 grams of mixed powder of high-purity alumina and calcium oxide was added, and stirred by a high-speed stirring disperser for 8 hours to obtain a composite mixed solution.

[0057] The third step is to heat the composite mixture to the spinning temperature of 70°C, put the composite mixture into the spinneret of the electrospinning device, and spray the composite mixture evenly on the base film through high-speed multi-nozzles to form a primary composite membrane;

[0058] The fourth step: the primary composite film enters the drying and solvent recovery device, and ...

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Abstract

The invention discloses a preparation method of a modified diaphragm for a lithium-ion secondary battery as well as a prepared modified diaphragm and a preparation device and is aimed to solve the problem of lithium battery modified diaphragms in the prior art. The method concretely comprises the following steps of: (1), evenly dispersing special fiber or oxide and a binder into an organic solvent to prepare composite mixed liquid, and adding a cosolvent into the organic solvent; (2) evenly spraying the composite mixed liquid obtained in the step (1) on a polyolefin base membrane to form a primary composite membrane through an electrostatic spinning method; and (3), drying the primary composite membrane obtained in the step (2) and recycling the solvent, and then finally obtaining the finished product. The preparation method is convenient to operate and environmental friendly, can realize large-scale production and has strong feasibility.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a preparation method of a modified diaphragm for a lithium ion secondary battery, the prepared modified diaphragm and a preparation device. Background technique [0002] In recent years, due to the pressure of environmental pollution and energy shortage, countries are forced to find new green, environmentally friendly and sustainable energy sources. The green, high-energy and environmentally friendly lithium-ion battery that appeared in the 1990s has become one of the most eye-catching power sources due to its high energy density, long cycle life, and high operating voltage. Lithium-ion battery separator, as one of the core materials of the battery, has an important impact on the interface structure, internal resistance, cycle performance and safety performance of the battery. A separator with excellent performance plays an important role in improving the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/32D04H1/72D01D5/00H01M2/16
CPCY02E60/10
Inventor 李凡群朱修峰杜俊起
Owner WANXIANG 123 CO LTD
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