Polyimide-based porous single-ion polymer electrolyte pi-FPAS separator and its preparation method and application

A PI-FPAS and polyimide technology, applied in the field of electrochemistry, can solve the problems of lithium-ion battery cycle stability and power performance adverse effects, low porosity, poor affinity of hydrophobic separator, etc., and achieve excellent thermal stability , the effect of high porosity

Active Publication Date: 2021-04-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, polyolefin-based microporous membranes have been successfully commercialized due to their excellent electrochemical stability, good mechanical properties, reasonable micro-pore structure and acceptable price, but the polyolefin separators prepared by stretching process are Ensuring good mechanical strength usually has low porosity (below 50%), and its inherent hydrophobicity makes the separator have poor affinity with conventional liquid electrolytes, which can adversely affect the cycle stability and power performance of Li-ion batteries. , due to the poor thermal stability of the polyolefin separator (the melting point of polyethylene is 130°C, and the melting point of polypropylene is 165°C), the polyolefin separator may cause safety hazards under the condition of overloading or high temperature in battery operation. It is difficult to meet the safety performance requirements of high-performance Li-ion batteries, therefore, separators with excellent heat resistance are essential for future high-energy-density batteries

Method used

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  • Polyimide-based porous single-ion polymer electrolyte pi-FPAS separator and its preparation method and application
  • Polyimide-based porous single-ion polymer electrolyte pi-FPAS separator and its preparation method and application
  • Polyimide-based porous single-ion polymer electrolyte pi-FPAS separator and its preparation method and application

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preparation example Construction

[0062] (i) Preparation of cathode material

[0063] The positive electrode material used in the present invention is lithium iron phosphate positive electrode, and active material LiFePO 4 , the mixture of conductive agent acetylene black and binder PVDF was uniformly dissolved in NMP, uniformly mixed with a mass ratio of 7:2:1, and stirred for 12 hours, during which ultrasonic treatment was performed three times, each time for 20 minutes, to obtain a yogurt-like viscous slurry, The slurry was then poured onto a flat aluminum foil and spread evenly with a spatula. After the solvent was fully volatilized, it was cut into discs with a diameter of 15 mm by a punching machine, and vacuum-dried at 60° C. for 24 h to be used in button cells.

[0064] (ii) Assembly of button cell

[0065] Adopt CR2025 type button battery to test among the present invention, take lithium iron phosphate as positive electrode material, the prepared single-ion polymer electrolyte membrane is diaphragm,...

Embodiment 1

[0069] A kind of preparation method of the porous single ion polymer electrolyte PI-FPAS diaphragm based on polyimide of the present embodiment, described method specifically comprises the following steps:

[0070] (1) Synthesis of bis(4-carbonylbenzenesulfonyl)imide (CBSI)

[0071] (a) The specific synthesis process of bis(4-carbonylbenzenesulfonyl)imide (CBSI) is shown in Formula 1. Take 0.1145mol of p-toluenesulfonamide, 0.1202mol of lithium hydroxide, and 0.0573mol of water in a 250mL two-necked bottle, heat to 95°C until they are completely dissolved, then slowly add 0.0573mol of p-toluenesulfonyl chloride for about 2 hours, and let stand overnight. When the reaction temperature drops to 45°C, adjust the pH to 7.0 with 1mol / L HCl, let it stand overnight, filter, the filter cake is p-toluenesulfonamide, store it dry, add the filtrate dropwise with concentrated hydrochloric acid until no precipitation occurs, filter, and remove the filter cake Use a large amount of hot wa...

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Abstract

The invention discloses a polyimide-based porous single-ion polymer electrolyte PI-FPAS diaphragm, a preparation method and an application thereof. The diaphragm of the present invention has a uniformly distributed spherical pore structure, and the pore structures are connected to each other, the porosity of the diaphragm is 65-67%, and the liquid absorption rate is 265-275wt.%. In the present invention, polyimide is used as the skeleton support material and blended with single-ion polymer electrolyte, and polyethylene glycol 6000 is used as the porogen through the template leaching technology to obtain a polyimide with excellent thermal stability and high porosity. Single-ion polymer electrolyte separator, polyethylene glycol is a non-toxic and environmentally friendly material, removing polyethylene glycol is much easier than removing common organic solvents from solution mixtures, therefore, the pore-forming technology of the present invention is more environmentally friendly And easy to operate. In addition, using the diaphragm prepared by the invention for lithium ion batteries can improve the cycle stability and safety performance of the batteries.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a polyimide-based porous single-ion polymer electrolyte PI-FPAS diaphragm and a preparation method and application thereof. Background technique [0002] At present, polyolefin-based microporous membranes have been successfully commercialized due to their excellent electrochemical stability, good mechanical properties, reasonable micro-pore structure and acceptable price, but the polyolefin separators prepared by stretching process are Guaranteed good mechanical strength Usually low porosity (below 50%), its inherent hydrophobicity makes the separator have poor affinity with conventional liquid electrolytes, which can adversely affect the cycle stability and power performance of Li-ion batteries, in addition , due to the poor thermal stability of the polyolefin separator (the melting point of polyethylene is 130°C, and the melting point of polypropylene is 16...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/414H01M50/423H01M50/489H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235H01M50/403H01M50/411Y02E60/10
Inventor 张运丰程寒松
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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