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Method for semi-interpenetrating network-structure similar-single ion solid-state polymer electrolyte by in-situ polymerization method

A solid polymer, network structure technology, applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of reducing battery cycle performance, low lithium ion migration number, etc., to reduce the phenomenon of concentration polarization , the effect of increasing the number of lithium ions and increasing the ionic conductivity

Active Publication Date: 2018-04-17
佳化化学(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional electrolyte system where anions and cations co-migrate, the migration number of lithium ions is low, and the migration of anions will lead to concentration polarization inside the system and reduce the cycle performance of the battery (OH B, VISSERS D, ZHANG Z, et al. New interpenetrating network type poly(siloxane-g-ethylene oxide) polymerelectrolyte for lithium battery[J]. Journal of Power Sources, 2003, 119(6): 442-447.)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] (1) Add 0.74g of lithium carbonate to 10ml of anhydrous N,N dimethylformamide, then add 4.14g of 2-acrylamido-2-methylpropanesulfonic acid, and continue stirring at room temperature for 2h until uniform Transparent solution

[0021] (2) Weigh 1.0g of polyethylene oxide and add it to 15ml of anhydrous N,N dimethylformamide, and stir in a water bath at 40°C for 6 hours until a uniform solution is formed;

[0022] (3) Mix the solution in step (2) with the solution in step (1) uniformly, then add 4.26g polyethylene glycol methacrylate, then add 0.08g azobisisobutyronitrile, and then Add 0.1ml of polyethylene glycol dimethacrylate, continue to stir for 30 minutes, and then ultrasound to remove the air in the system;

[0023] (4) Pour the mixed solution in step (3) into a polytetrafluoroethylene mold, place it in a vacuum drying oven at 65°C, react for 6 hours, and then raise the temperature to 80°C. After the solvent evaporates, it becomes a polymer electrolyte membrane.

Embodiment approach 2

[0025] (1) Add 0.74g of lithium carbonate to 10ml of anhydrous N,N dimethylformamide, then add 4.14g of 2-acrylamido-2-methylpropanesulfonic acid, and continue stirring at room temperature for 2h until uniform Transparent solution

[0026] (2) Weigh 1.0g of polymethyl methacrylate and add it to 15ml of anhydrous N,N dimethylformamide, and stir in a water bath at 80°C for 6 hours until a uniform solution is formed;

[0027] (3) Mix the solution in step (2) with the solution in step (1) evenly, then add 4.26g polyethylene glycol methacrylate, and then add 0.08g azobisisobutyronitrile, and then Add 0.15ml of polyethylene glycol dimethacrylate, continue to stir for 30 minutes, and then ultrasound to remove the air in the system;

[0028] (4) Pour the mixed solution in step (3) into a polytetrafluoroethylene mold, place it in a vacuum drying oven at 65°C, react for 6 hours, and then raise the temperature to 80°C. After the solvent evaporates, it becomes a polymer electrolyte membrane.

Embodiment approach 3

[0030] (1) Add 0.74g of lithium carbonate to 10ml of anhydrous N,N dimethylformamide, then add 4.14g of 2-acrylamido-2-methylpropanesulfonic acid, and continue stirring at room temperature for 2h until uniform Transparent solution

[0031] (2) Weigh 1.0g of polyurethane and add it to 15ml of anhydrous N,N dimethylformamide, and stir in a water bath at 80°C for 6 hours until a uniform solution is formed;

[0032] (3) Mix the solution in step (2) with the solution in step (1) uniformly, then add 6.40g polyethylene glycol methacrylate, and then add 0.10g azobisisobutyronitrile, and then Add 0.2ml of polyethylene glycol dimethacrylate, continue to stir for 30 minutes, and then ultrasound to remove the air in the system;

[0033] (4) Pour the mixed solution in step (3) into a polytetrafluoroethylene mold, place it in a vacuum drying oven at 65°C, react for 6 hours, and then raise the temperature to 80°C. After the solvent evaporates, it becomes a polymer electrolyte membrane.

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Abstract

The invention discloses a method for a semi-interpenetrating network-structure similar-single ion solid-state polymer electrolyte by an in-situ polymerization method. The method comprises the steps ofdissolving a high polymer in an appropriate solvent to prepare a uniform mixed solution, adding a monomer, an initiator, a crosslinking agent and 2-acrylamide-2-methyl propane sulfonic acid lithium salt into a high polymer solution, removing air in the solution with ultrasound after uniform stirring, triggering polymerization in a vacuum drying box at 50-70 DEG C, rising a temperature to 80 DEG C, and obtaining a polymer electrolyte membrane after the solvent is volatilized. The prepared polymer electrolyte membrane is a semi-interpenetrating network-structure crosslinking polymer membrane, and the polymer membrane is high in mechanical strength; negative ions are fixed on a polymer chain segment, lithium ions are easier to migrate, and the ion conductivity of the polymer electrolyte canbe improved; and meanwhile, the method is simple in preparation process, complicated process flow is not needed, and the prepared polymer electrolyte membrane has excellent machining performance.

Description

Technical field [0001] The invention belongs to the technical field of batteries, and is specifically a polymer electrolyte membrane that can have the dual functions of a diaphragm and an electrolyte in a polymer battery. Background technique [0002] Due to the high voltage, high energy density, long cycle life and low self-discharge of lithium ion batteries, they are widely used in notebook computers, mobile phones, tablet computers and other electronic devices, but traditional lithium ion batteries are used to transfer lithium The main ions are organic electrolytes, and the existence of electrolytes severely limits the processing shape of lithium-ion batteries, and the electrolytes are mostly toxic substances, which are harmful to the human body, especially the organic electrolytes in lithium-ion batteries It has the shortcomings of being easy to leak, volatile and flammable, and it will burn or even explode at high temperature. The solid polymer battery has the advantages of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058C08F283/06C08F220/58
CPCC08F283/065H01M10/0525H01M10/0565H01M10/058H01M2300/0082C08F220/585Y02E60/10Y02P70/50
Inventor 刘伟良陈立宁朱文凯王一凡孔凡功王守娟
Owner 佳化化学(上海)有限公司
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