A kind of battery diaphragm and preparation method thereof and lithium ion battery

A battery separator and separator technology, which is used in secondary batteries, battery pack components, and secondary battery repair/maintenance, etc., can solve the problems of difficult preparation of new material separators and battery separators that cannot meet the requirements, and achieve good high temperature resistance performance. , good flame retardant performance, the effect of improving safety performance

Active Publication Date: 2020-08-25
BYD CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing battery diaphragm cannot meet the requirements gradually or the new material diaphragm is difficult to prepare and its application is limited, so as to provide an easy-to-prepare and strong Li+ ion conductivity that can improve the rate performance and cycle performance of the battery. Battery separator capable of improving battery safety performance, preparation method thereof, and lithium ion battery containing the battery separator

Method used

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  • A kind of battery diaphragm and preparation method thereof and lithium ion battery
  • A kind of battery diaphragm and preparation method thereof and lithium ion battery
  • A kind of battery diaphragm and preparation method thereof and lithium ion battery

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preparation example Construction

[0050] The present invention also provides a method for preparing the above-mentioned battery separator, which is prepared by the above-mentioned ionic liquid polymer. Preferably, the battery separator is obtained by spinning the above-mentioned ionic liquid polymer. Specifically, the above-mentioned ionic liquid polymer can be dissolved in an organic solvent to obtain a uniform solution, and then the solution is spun with a spinning machine to form a membrane, and finally the membrane is dried and pressed under a pressure of 1-20 MPa to form a diaphragm. The organic solvent can be methanol, ethanol, acetonitrile, N,N-dimethylformamide, N,N-dimethylacetamide, acetonitrile, dimethylsulfoxide, nitromethane, acetone, ethyl acetate, N-formaldehyde Base pyrrolidone etc.

[0051] The present invention also provides a lithium-ion battery, which includes a battery casing, a pole core and an electrolyte, the pole core and the electrolyte are accommodated in the battery casing, the pol...

Embodiment 1

[0055] (1) Preparation of ionic liquid polymer

[0056]

[0057] Take 2.0266g (10mmol) of p-vinylbenzenesulfonamide, 2.3794g (20mmol) of thionyl chloride, and 1.3982g (12mmol) of chlorosulfonic acid at 100°C for 12h to obtain compound 1a (2.5357g, yield 90%) ; 1 H NMR (400MHz, CDCl 3 , ppm), δ=7.88(d,2×1H), 7.58(d,2×1H), 6.63(q,1H), 5.61(q,1H), 5.18(q,1H), 2.0(s,1H );

[0058] Take 2.8174g (10mmol) of compound 1a and 2.1451g (12mmol) of SbF 3 Reacted at 60°C for 12h to obtain compound 1b (2.3875g, yield 90%); 1 H NMR (400MHz, CDCl 3 , ppm), δ=7.88(d,2×1H), 7.58(d,2×1H), 6.63(q,1H), 5.61(q,1H), 5.18(q,1H), 2.0(s,1H );

[0059] Take 2.6528g (10mmol) of compound 1b and 1.3821g (10mmol) K 2 CO 3 Reacted at 25°C for 2h to obtain compound 1c (3.0337g, yield 100%); 1 H NMR (400MHz, CDCl 3 , ppm), δ=7.88(d,2×1H), 7.58(d,2×1H), 6.63(q,1H), 5.61(q,1H), 5.18(q,1H);

[0060] Take 3.0337g (10mmol) of compound 1c and 1.6128g (11mmol) of 1-ethyl-3-methylimidazole chloride to r...

Embodiment 2

[0071] (1) Preparation of ionic liquid polymer:

[0072]

[0073] Take 2.0266g (10mmol) of p-vinylbenzenesulfonamide, 2.3794g (20mmol) of thionyl chloride, and 1.3982g (12mmol) of chlorosulfonic acid at 100°C for 12h to obtain compound 2a (2.5357g, yield 90%) ; 1 H NMR (400MHz, CDCl 3 , ppm), δ=7.88(d,2×1H), 7.58(d,2×1H), 6.63(q,1H), 5.61(q,1H), 5.18(q,1H), 2.0(s,1H );

[0074] Take 2.8174g (10mmol) of compound 2a and 2.1451g (12mmol) of SbF 3 Reacted at 60°C for 12h to obtain compound 2b (2.3875g, yield 90%); 1 H NMR (400MHz, CDCl 3 , ppm), δ=7.88(d,2×1H), 7.58(d,2×1H), 6.63(q,1H), 5.61(q,1H), 5.18(q,1H), 2.0(s,1H );

[0075] Take 2.6528g (10mmol) of compound 2b and 1.3812g (10mmol) PhCO 3 H, 1.3821g (10mmol)K 2 CO 3 Reacted at 25°C for 12h to obtain compound 2c (2.8743g, yield 90%); 1H NMR (400MHz, CDCl 3 , ppm), δ=7.86(d,2×1H), 7.47(d,2×1H), 3.82(t,1H), 2.83(d,2H);

[0076] Take 3.1937g (10mmol) of compound 2c and 1.6128g (11mmol) of 1-ethyl-3-methylimidazol...

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Abstract

The invention provides a battery separator, a preparation method thereof, and a lithium ion battery containing the battery separator. The material of the battery separator includes at least one ionic liquid polymer shown in formula (1)-formula (3), and the separator is easily The preparation and strong Li+ ion conductivity can improve the rate performance and cycle performance of the battery, and at the same time improve the safety performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a battery diaphragm, a preparation method thereof and a lithium ion battery containing the battery diaphragm. Background technique [0002] As an important part of lithium-ion batteries, the battery separator mainly plays the role of conducting lithium ions and preventing the contact between positive and negative electrodes. The existing commercial separators mainly include conventional PE (polyethylene), PP (polypropylene), or PP / PE / PP separator, but as the application of batteries becomes more and more extensive, the performance requirements for them are getting higher and higher, and ordinary separators are gradually unable to meet the requirements. The existing improved polymer diaphragm with polymer coating, such as PVDF-HFP / Polyolefin separator (polyolefin-based film) / PVDF-HFP diaphragm, has a three-layer structure, and the upper and lower layers ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/42H01M50/403H01M50/411H01M50/44H01M50/446H01M50/497
CPCH01M10/0525H01M10/4235H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 宋威郭姿珠
Owner BYD CO LTD
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