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PAMPSLi fiber based polymer electrolyte membrane preparation method utilizing electrospinning method

An electrospinning method and electrolyte membrane technology, which is applied in the field of preparation of polymer electrolytes for polymer lithium-ion batteries, can solve the problems of concentration polarization and low ion migration number, and achieve high liquid absorption rate and high ion conductivity rate, the effect of eliminating concentration polarization

Active Publication Date: 2011-11-23
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problems of concentration polarization and low ion migration number in the salt polymer electrolyte system; and provides a method for preparing PAMPSLi fiber-based polymer electrolyte membrane by electrospinning

Method used

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  • PAMPSLi fiber based polymer electrolyte membrane preparation method utilizing electrospinning method
  • PAMPSLi fiber based polymer electrolyte membrane preparation method utilizing electrospinning method
  • PAMPSLi fiber based polymer electrolyte membrane preparation method utilizing electrospinning method

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specific Embodiment approach 1

[0014] Specific embodiment one: the method for preparing PAMPSLi fiber-based polymer electrolyte membrane by electrospinning method in the present embodiment is carried out according to the following steps:

[0015] 1. Slowly add 2-acrylamide-2-methylpropanesulfonic acid (AMPS for short) into N, N-dimethylformamide (DMF for short, as a solvent) to make a concentration of 2.0mol / L 2- N,N-dimethylformamide solution of acrylamide-2-methylpropanesulfonic acid, then add azobisisobutyronitrile (abbreviated as AIBN, as initiator) to make the concentration of azobisisobutyronitrile equal to AMPS quality 1% of nitrogen gas for 30min (purpose to get rid of oxygen), then polymerized at 75°C for 10h to obtain the DMF solution of PAMPS;

[0016] Two, the DMF solution of PAMPS is diluted to PAMPS concentration with deionized water and is 40g / L, then slowly adds lithium carbonate (Li 2 CO 3 ) (lithium ions replace the hydrogen ions of the sulfonate group), lithium carbonate and 2-acrylamid...

specific Embodiment approach 2

[0022] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the electrospinning method described in step 3 uses a syringe pump to control the flow rate of the spinning solution, and extrudes the spinning solution from a stainless steel needle. The stainless steel needle is connected to the positive pole of the high-voltage power supply, the negative pole of the power supply is connected to the receiving plate, the distance between the fixed needle plates is 20cm, and the spinning voltage is 19kV. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the solvent described in step 3 is formed by mixing deionized water and ethanol at a mass ratio of 1:1. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

A PAMPSLi (poly-vinylacetate-methyl methacrylate acid lithium) fiber based polymer electrolyte membrane preparation method utilizing an electrospinning method. The method belongs to the field of preparation of polymer electrolyte for polymer lithium ion battery. The invention mainly solves problems of concentration polarization phenomenon and low ion transport number in a salt polymer electrolytesystem. The PAMPSLi fiber based polymer electrolyte of the invention is prepared by employing a polymer electrolyte PAMPSLi as a polymer matrix and a lithium ion source to eliminate the concentrationpolarization phenomenon effectively, and the prepared membrane has a submicron pore structure, large specific surface area and high imbibition rate. In addition, a dual solvent system is employed to prepare a spinning liquid, so that shape and dimension of fiber can be controlled by adjusting the dual solvent composition. The PAMPSLi fiber based single ion polymer electrolyte has a conductivity reaching 2.12*10<-5>S / cm at room temperature, good electrochemical stability and an electrochemical window reaching 4.4V vs Li, so as to satisfy application requirements of a lithium ion battery. The preparation technology of the invention is simple, does not require a large consumption of solvents, has little environmental pollution, and is suitable for industrialized scale production.

Description

technical field [0001] The invention belongs to the field of preparation of polymer electrolytes for polymer lithium ion batteries; in particular, it relates to a method for preparing PAMPSLi fiber-based polymer electrolyte membranes by electrospinning. Background technique [0002] With the increasingly severe energy crisis, the effective use of energy to better serve our production and life has become a common concern of all countries in the world. As an excellent battery energy storage system, lithium-ion batteries have high energy density and charge-discharge conversion rate, and are considered to be the best green energy storage method. Polymer lithium-ion battery is a new generation of rechargeable lithium-ion battery developed on the basis of liquid lithium-ion batteries. It has a simple structure and flexible shape design, which improves the safety of liquid lithium-ion batteries from leakage and explosion. question. As an important part of polymer lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565D04H1/72D01D5/00
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 唐冬雁崔巍巍宫再霖林秀玲
Owner HARBIN INST OF TECH
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