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Sulfonated polyimide binder, electrode plate and lithium ion battery

A sulfonated polyimide, lithium-ion battery technology, applied in adhesives, secondary batteries, battery electrodes, etc., can solve the problems of not keeping the electrical contact of alloy particles well, affecting battery performance, and decreasing cycle capacity, etc. Achieve the effect of enhancing lithium-ion battery performance, improving ion conductivity, and reducing expansion rate

Active Publication Date: 2020-10-16
浙江中科玖源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used binders are polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), etc. PVDF binders tend to swell in the electrolyte and cannot maintain the electrical contact between the alloy particles well. , resulting in electrode failure and a sharp drop in cycle capacity
PTFE has good stability. Due to its structural limitation, it leads to large internal resistance, which seriously affects the performance of the battery.

Method used

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  • Sulfonated polyimide binder, electrode plate and lithium ion battery
  • Sulfonated polyimide binder, electrode plate and lithium ion battery
  • Sulfonated polyimide binder, electrode plate and lithium ion battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] A kind of sulfonated polyimide binder, its preparation method comprises the steps:

[0032] S1. Under nitrogen protection, dissolve 10mmol 2,5-diaminobenzenesulfonic acid and 10mmol triethylamine in 40mL m-cresol, then add 10mmol 3,3',4,4'-benzophenone tetracarboxylic acid Dianhydride, stirred and reacted for 4h to obtain a sulfonated polyamide solution;

[0033] S2. Heat the sulfonated polyamide solution obtained in step S1 to 180°C, react at a constant temperature for 18 hours, carry out imidization, cool to room temperature, slowly add it to a flask containing methanol, precipitate and filter, and take a large amount of the precipitate Rinse with methanol and dry, then soak in 1mol / L dilute hydrochloric acid solution for 24 hours, wash with deionized water, and then vacuum dry at 100°C to obtain a sulfonated polyimide binder.

Embodiment 2

[0035] A kind of sulfonated polyimide binder, its preparation method comprises the steps:

[0036] S1. Under nitrogen protection, dissolve 10mmol 4,4'-diaminodiphenylmethane-2,2'-disulfonic acid and 20mmol triethylamine in 40mL m-cresol, then add 10mmol 3,3',4 , 4'-benzophenone tetracarboxylic dianhydride, stirred and reacted for 2h to obtain a sulfonated polyamide solution;

[0037] S2. Heat the sulfonated polyamide solution obtained in step S1 to 170°C, react at a constant temperature for 18 hours, carry out imidization, cool to room temperature, slowly add it to a flask containing methanol, precipitate and filter, and take a large amount of the precipitate Rinse with isopropanol and dry, then soak in 1mol / L dilute hydrochloric acid solution for 24 hours, wash with deionized water, and then vacuum dry at 100°C to obtain a sulfonated polyimide binder.

Embodiment 3

[0039] A kind of sulfonated polyimide binder, its preparation method comprises the steps:

[0040] S1. Under nitrogen protection, dissolve 3.58g 4,4'-diaminodiphenyl ether-2,2'-disulfonic acid and 2.02g triethylamine in 40mL m-cresol, then add 10mmol 3,3' , 4,4'-benzophenone tetracarboxylic dianhydride, stirred for 2 hours to obtain a sulfonated polyamide solution;

[0041] S2. Heat the sulfonated polyamide solution obtained in step S1 to 190°C, react at a constant temperature for 6 hours, carry out imidization, cool to room temperature, slowly add it to a flask containing methanol, precipitate and filter, and take a large amount of the precipitate Rinse with methanol and dry, then soak in 1mol / L dilute hydrochloric acid solution for 24 hours, wash with deionized water, and then vacuum dry at 100°C to obtain a sulfonated polyimide binder.

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Abstract

The invention discloses a sulfonated polyimide binder and a preparation method thereof, and a lithium ion battery electrode plate and a lithium ion battery using sulfonated polyimide as a binder. Polyimide is used as a framework of the sulfonated polyimide binder and has high mechanical properties, the tensile strength of the binder is improved, and slippage between the binder and active materialparticles is effectively inhibited so that separation is not caused in multiple shrinkage and expansion cycles, meanwhile, groups such as sulfonate radicals are introduced, the ionic conductivity is improved, the performance of a lithium ion battery is enhanced, the expansion rate of a fully-charged pole piece is obviously reduced, and the first charge-discharge efficiency is greater than 80%.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a sulfonated polyimide binder, an electrode sheet and a lithium ion battery. Background technique [0002] In recent years, due to the depletion of traditional energy sources, the thirst for new energy sources is increasing, especially the rapid development of industries such as automobiles and electronics. Lithium-ion batteries are favored by the market due to their high density, long cycle life, environmental friendliness, and low price. . However, due to product upgrading and technological innovation, it is increasingly difficult for existing lithium-ion batteries to meet market demand. To this end, researchers are constantly looking for ways to improve the performance of existing lithium batteries. Many scientific researchers focus on improving the performance of negative electrode materials. Since the theoretical capacity of traditional graphite negative electrod...

Claims

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Application Information

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IPC IPC(8): C09J179/08C08G73/10H01M4/62H01M4/13H01M10/0525
CPCC09J179/08C08G73/1067C08G73/106C08G73/1071C08G73/1007H01M4/622H01M4/13H01M10/0525Y02E60/10
Inventor 张群金文斌
Owner 浙江中科玖源新材料有限公司
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