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A lithium ion polymer electrolyte membrane and preparation method and application thereof

An electrolyte membrane and polymer technology, applied in the manufacture of electrolyte batteries, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of difficult to meet the application of solid-state lithium batteries at room temperature, low lithium ion migration number, and low room temperature ionic conductivity, etc. To achieve the effect of easy operation, high room temperature ionic conductivity and good electrochemical stability

Active Publication Date: 2019-01-11
张家港保税区宝邦新能源材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of existing polymer solid electrolytes formed by common polymers such as polyethylene oxide and polycarbonate are: low room temperature ionic conductivity, which is difficult to meet the application of room temperature solid-state lithium batteries; small molecule lithium salts are still used as lithium electrolytes. Ion source, the lithium ion migration number is not high; and these polymers have poor flame retardancy; at the same time, the existing polymer solid electrolytes cannot maintain chemical stability in a wide temperature range

Method used

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  • A lithium ion polymer electrolyte membrane and preparation method and application thereof
  • A lithium ion polymer electrolyte membrane and preparation method and application thereof
  • A lithium ion polymer electrolyte membrane and preparation method and application thereof

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preparation example Construction

[0038] The embodiment of the present invention also provides a kind of preparation method of above-mentioned lithium ion polymer electrolyte membrane, it comprises the following steps:

[0039] The sulfonated polyoxadiazole SPOD stock solution is coagulated in a coagulation bath to obtain a solid sulfonated polyoxadiazole SPOD film; the sulfonated polyoxadiazole film is lithiated with a lithium salt, and the lithium salt can be lithium carbonate Li 2 CO 3 Or lithium hydroxide LiOH, to obtain a solid polyoxadiazole sulfonate lithium Li-SPOD electrolyte membrane, that is, a lithium ion polymer electrolyte membrane.

[0040] Among them, the coagulation method is as follows: take the sulfonated polyoxadiazole SPOD stock solution, heat it to 80-98 ° C, cast and coat it on the corrosion-resistant substrate to form a film, immerse it in a coagulation bath of 35-45wt% sulfuric acid solution and solidify until it falls off naturally , to obtain sulfonated polyoxadiazole film, that is,...

Embodiment 1

[0056] The present embodiment provides a kind of Li-SPOD membrane, and it makes according to following preparation method:

[0057] In a 100ml three-neck bottle equipped with mechanical stirring, dissolve 5.69g of hydrazine sulfate, 4.84g of terephthalic acid and 3.23g of diphenyl ether dicarboxylic acid in 50ml of fuming sulfuric acid, raise the temperature to the prepolymerization temperature of 85°C, and react for 2h Then heat up to the polycondensation temperature of 120°C, continue the reaction for 3h; add 0.36g of chain terminator benzoic acid, continue to raise the temperature to 140°C for further cyclization for 2h to end the reaction, and obtain the SPOD stock solution; vacuum defoam the SPOD stock solution for use, The measured solid content of the SPOD stock solution was 6 wt%.

[0058] Take a certain quality of SPOD stock solution, heat it to 90°C, cast it on a clean glass plate to form a film, and then immerse it in a coagulation bath of 40wt% sulfuric acid soluti...

Embodiment 2

[0061] The present embodiment provides a kind of Li-SPOD membrane, and it makes according to following preparation method:

[0062] In a 100ml three-neck flask equipped with mechanical stirring, add 5.69g of hydrazine sulfate into 50mL of fuming sulfuric acid, stir and dissolve at 60°C, and then add 0.042mol of terephthalic acid and 4,4'- For diphenyl ether dicarboxylic acid, the molar ratio of the two dibasic acids is 3:7 respectively, first react at 85°C for 2h; Under reaction for 2h, the SPOD stock solution was obtained.

[0063] Take a certain quality of SPOD stock solution, heat it to 80°C, cast it on a clean glass plate to form a film, and then immerse it in a coagulation bath of 35wt% sulfuric acid solution to solidify until it falls off naturally to obtain a SPOD film.

[0064] Soak the formed SPOD film in 0.8mol / L LiOH solution for 30h, rinse it with deionized water until it is close to neutral, take it out and dry it at 100°C, and finally obtain a Li-SPOD film with ...

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Abstract

A lithium ion polymer electrolyte membrane and its preparation method and application relate to that field of solid electrolyte. The preparation method of the lithium ion polymer electrolyte membraneof the embodiment of the invention is that the sulfonated poly (phosphodiazole) stock solution is solidified to obtain the sulfonated poly (phosphodiazole) film, and the sulfonated poly (phosphodiazole) film is reacted with lithium salt to obtain the poly (phosphodiazole) sulfonate lithium electrolyte membrane; and the sulfonated poly (phosphodiazole) film is solidified to obtain the sulfonated poly (phosphodiazole) film; or preparing lithium poly (1, 2-diazole sulfonate) solution by sulfonated poly (1, 2-diazole sulfonate) stock solution and lithium salt, and coagulating to form membrane to obtain poly (1, 2-diazole sulfonate) lithium electrolyte membrane. The method is simple and easy to operate. The poly (phthalazinesulfonic acid) lithium electrolyte membrane of the embodiment of the invention has high room temperature ionic conductivity, good electrochemical stability, flame retardancy and excellent heat resistance; a lithium ion polymer electrolyte membrane accord to an embodimentof that present invention is used as a solid-state electrolyte membrane of a solid-state lithium battery.

Description

technical field [0001] The invention relates to the field of solid electrolytes, and in particular to a lithium ion polymer electrolyte membrane, a preparation method and application thereof. Background technique [0002] The composition of a conventional lithium-ion battery mainly includes positive and negative electrode materials, a separator and an electrolyte. Among them, the electrolyte, as one of the important components of the battery, mainly undertakes the role of transferring charge inside the battery to complete the oxidation-reduction reaction. The liquid electrolytes commonly used in lithium-ion batteries are mainly composed of carbonate-based organic solvents, small-molecule lithium salts, and necessary additives. Such electrolytes have limited electrochemical windows, poor safety, and Li + Low mobility and poor adaptability to the environment. In response to the above shortcomings of liquid electrolytes, researchers have developed solid-state electrolytes, amo...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 姜猛进徐建军毛建昭李志愿吕婉婉杨晨
Owner 张家港保税区宝邦新能源材料科技有限公司
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