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A kind of high-performance lithium ion battery separator and preparation method thereof

A lithium-ion battery, high-performance technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of methylene chloride solvent environmental pollution, unfavorable health of operators, etc., to achieve good liquid absorption and The effects of liquid retention, guaranteed mechanical properties, high temperature resistance, and small shrinkage

Active Publication Date: 2022-07-01
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, white oil is often used as a porogen in conventional wet preparation of polyolefin diaphragms, and methylene chloride is used for extraction. However, methylene chloride is a solvent that pollutes the environment and is not conducive to the health of operators. Therefore, how to improve the wet process to make production Process green environmental protection is another technical problem that the present invention needs to solve

Method used

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  • A kind of high-performance lithium ion battery separator and preparation method thereof
  • A kind of high-performance lithium ion battery separator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A high-performance lithium-ion battery separator, comprising the following raw materials in parts by weight: 100 parts of UHMWPE-g-PMMA, 5 parts of modified beta-eucryptite, and 50 parts of povidone;

[0029] Among them, the preparation method of UHMWPE-g-PMMA is as follows: UHMWPE and PMMA are respectively placed in PE bags and sealed, and then subjected to electron beam irradiation treatment. The beam current intensity of the electron beam is 0.05A, and the irradiation dose rate is 20Gy / s. 100 parts by weight of irradiated UHMWPE and 5 parts by weight of irradiated PMMA were melt-blended, extruded and pelletized at 170° C. to prepare UHMWPE-g-PMMA particles for later use.

[0030] Wherein, the preparation method of the modified β-eucryptite is as follows: adding β-eucryptite with a particle size of 0.1 to 0.5 microns into a coupling agent solution (an ethanol solution containing 1wt% titanate) to form a solid content It is 35wt% of the material, and then the modified ...

Embodiment 2

[0034] A high-performance lithium-ion battery separator, comprising the following raw materials in parts by weight: 100 parts of UHMWPE-g-PMMA, 10 parts of modified beta-eucryptite, and 50 parts of povidone;

[0035] Among them, the preparation method of UHMWPE-g-PMMA is as follows: UHMWPE and PMMA are respectively placed in PE bags and sealed, and then subjected to electron beam irradiation treatment. The beam current intensity of the electron beam is 0.05A, and the irradiation dose rate is 40Gy / s. , irradiated for 10min, 100 parts by weight of irradiated UHMWPE and 10 parts by weight of irradiated PMMA were melt-blended, extruded and pelletized at 170°C to prepare UHMWPE-g-PMMA particles for later use.

[0036] Wherein, the preparation method of the modified β-eucryptite is as follows: adding β-eucryptite with a particle size of 0.1 to 0.5 microns into a coupling agent solution (an ethanol solution containing 1wt% titanate) to form a solid content It is 30wt% of the material...

Embodiment 3

[0040] A high-performance lithium-ion battery separator, comprising the following raw materials in parts by weight: 100 parts of UHMWPE-g-PMMA, 15 parts of modified beta-eucryptite, and 50 parts of povidone;

[0041] Among them, the preparation method of UHMWPE-g-PMMA is as follows: UHMWPE and PMMA are respectively placed in PE bags and sealed, and then subjected to electron beam irradiation treatment. The beam current intensity of the electron beam is 0.05A, and the irradiation dose rate is 60Gy / s. 10 minutes of irradiation, 100 parts by weight of irradiated UHMWPE and 10 parts by weight of irradiated PMMA were melt-blended and extruded at 180°C to prepare UHMWPE-g-PMMA particles for later use.

[0042] Wherein, the preparation method of the modified β-eucryptite is as follows: adding β-eucryptite with a particle size of 0.1 to 0.5 microns into a coupling agent solution (an ethanol solution containing 1wt% titanate) to form a solid content It is 20wt% of the material, and the...

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Abstract

The invention relates to a high-performance lithium ion battery separator and a preparation method thereof, comprising the following raw materials in parts by weight: 100 parts of UHMWPE-g-PMMA, 5-20 parts of modified β-eucryptite, and 40-65 parts of povidone The povidone is a pore-forming agent in the process of preparing the diaphragm, and water is used to extract the povidone; the preparation method is: the UHMWPE-g-PMMA and the modified β-eucryptite of the formula amount are first carried out For the first banburying, after cooling down, add povidone for the second banburying, and after banburying is uniform, a thick sheet is obtained by casting, and then the thick sheet is subjected to synchronous biaxial stretching to obtain a membrane, and the membrane is The microporous membrane is obtained by immersing in flowing water to remove the povidone in the membrane sheet, and then pulling to shape, rolling and slitting to obtain a lithium ion battery separator. The separator of the present invention has high rate characteristics and better cycle stability for lithium ion batteries, and has a higher lithium ion migration number.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery separators, in particular to a high-performance lithium ion battery separator and a preparation method thereof. Background technique [0002] Lithium-ion battery is the representative of modern high-performance battery, which consists of four main parts: positive electrode material, negative electrode material, separator, and electrolyte. The working principle of lithium-ion batteries is: lithium ions shuttle back and forth between the high lithium intercalation potential positive electrode and the low lithium intercalation potential negative electrode, along with the storage and release of energy, the dissolution and precipitation of lithium are not involved in the process, so lithium dendrites are avoided. The generation of the battery improves the safety performance of the battery. The deintercalation of lithium ions in the normal charge and discharge process will not destroy the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/411H01M50/403H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 翁星星李正林沈亚定盛夏
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD