A battery separator and a preparation method thereof

A battery diaphragm and scraping film technology, which is applied in secondary batteries, battery components, circuits, etc., can solve the problems of battery safety performance and ion conductivity threat, low thermal stability, poor electrolyte wettability, etc., and achieve good Thermal stability, low production cost, good thermal stability effect

Inactive Publication Date: 2018-12-25
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to provide a battery separator to solve the problem that the traditional polyolefin separator has low thermal stability and poor wettability to the electrolyte, which seriously threatens the safety performance and ion conductivity of the battery

Method used

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Examples

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Effect test

preparation example Construction

[0035] The preparation method of the described battery diaphragm comprises the following steps:

[0036] Dispersing alumina in a solvent to obtain an alumina dispersion; adding polyvinylidene fluoride, polyvinylpyrrolidone and dimethylacetamide, and mixing to obtain a polyvinylidene fluoride and alumina blend casting solution; Cool the casting solution from room temperature to the scraping temperature, scrape the casting solution on a glass plate to form a liquid film with a thickness of 15-35 μm, and quickly immerse the liquid film together with the glass plate in deionized water and dimethylacetamide to mix solution, placed until solidified to form a primary film, soaked and cleaned, and vacuum-dried to obtain the battery separator.

[0037] Preferably, the solvent is ethanol solution.

[0038] Preferably, the dispersion adopts ultrasonic dispersion, and preferably, the time of ultrasonic dispersion is 20min-1h.

[0039] Typical but non-limiting examples of the ultrasonic ...

Embodiment 1

[0048] The preparation method of the battery diaphragm provided by the application specifically includes the following steps:

[0049] Weigh 0.05g of alumina and 50ml of absolute ethanol to blend, and ultrasonicate for 30min to obtain an alumina dispersion with a concentration of 1g / L;

[0050] Weigh 20g of polyvinylidene fluoride, add 6g of polyvinylpyrrolidone, 20ml of 1g / L alumina dispersion, then add 73.98g of dimethylacetamide, mix and stir for 3 hours at 80°C to obtain polyvinylidene Vinyl fluoride and alumina blend casting solution;

[0051]Cool the casting solution from room temperature to the scraping temperature of 40°C, scrape the casting solution on a glass plate to form a liquid film with a thickness of 15 μm, and quickly immerse the liquid film together with the glass plate in deionized water and di Place in the mixed solution of methylacetamide for 10 seconds to solidify into a film, then transfer to deionized water, soak and wash for 5 minutes, then vacuum dry...

Embodiment 2

[0053] The preparation method of the battery diaphragm provided by the application specifically includes the following steps:

[0054] Weigh 0.05g of alumina and 50ml of absolute ethanol to blend, and ultrasonicate for 30min to obtain an alumina dispersion with a concentration of 1g / L;

[0055] Weigh 10g of polyvinylidene fluoride, add 1g of polyvinylpyrrolidone, 10ml of 1g / L alumina dispersion, and then add 89g of dimethylacetamide, and mix and stir for 2 hours at 65°C to obtain polyvinylidene fluoride Ethylene and alumina blend casting solution;

[0056] Cool the casting solution from room temperature to the scraping temperature of 60°C, scrape the casting solution on a glass plate to form a liquid film with a thickness of 20 μm, and quickly immerse the liquid film together with the glass plate in deionized water and distilled water with a volume ratio of 2:1. Place in the mixed solution of methylacetamide for 20 seconds to solidify into a film, then transfer to deionized w...

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Abstract

The invention provides a battery separator and a preparation method thereof, the battery separator comprising the following components prepared in parts by mass: polyvinylidene fluoride 10-25 parts, pore forming agent 1-5 parts, alumina 0.001-0.01 part, and dimethylacetamide 72-89 parts. The battery separator provided by the invention adopts polyvinylidene fluoride and alumina, and the prepared blended polymer separator has good thermal stability, and the thermal decomposition temperature is as high as 460 DEG C and the decomposition voltage is 4.6 V, which is obviously improved compared withthe PE membrane. The preparation method of the battery separator provided by the invention has the advantages of simple process, strong operability and low production cost, and the prepared battery separator has good thermal stability, high decomposition voltage and good liquid retention rate, and has practical feasibility and practicability.

Description

technical field [0001] The invention relates to the technical field of battery separator materials, in particular to a battery separator and a preparation method thereof. Background technique [0002] Traditional lithium-ion battery separators use polyolefins as raw materials, such as polyethylene, polypropylene, etc., to make pores through physical stretching (dry method, wet method) or chemical extraction processes to obtain porous films. The separator has poor wettability and low liquid retention, which leads to easy leakage of the electrolyte, which seriously affects the safety performance of the battery and the conductivity of lithium ions. [0003] In view of this, the present invention is proposed. Contents of the invention [0004] The first object of the present invention is to provide a battery separator to solve the problem that the traditional polyolefin separator has low thermal stability and poor wettability to electrolyte, which seriously threatens the safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/409H01M50/417
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 徐锋袁海朝孟欣欣苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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