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Flame-retardant polymer solid electrolyte material and electrolyte membrane and application thereof

A solid electrolyte membrane, flame retardant polymer technology, used in circuits, electrical components, secondary batteries, etc., can solve the problems of reduced lithium ion conductivity, environmental and construction personnel damage, and electrolyte membrane brittleness. The effect of improving flame retardancy, ensuring safety, and improving ionic conductivity

Active Publication Date: 2019-04-05
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolyte prepared by this method is essentially complexed with PEO ethylene oxide and the anions in the lithium salt to form a soft mixture; and at low temperatures, the performance of lithium ion conduction will drop sharply, resulting in the battery no longer working
In this regard, Chinese patent CN102738426 A discloses a high-temperature-resistant lithium battery. The electrolyte membrane is prepared by the thermosetting reaction of polyimide and polycarbosilane, which endows the battery with high-temperature resistance, but the electrolyte membrane prepared by this method is brittle. The safety is poor, and a large amount of toxic solvents such as N-methylpyrrolidone, dimethylacetamide and dimethylformamide still need to be used in the process, which is extremely harmful to the environment and construction personnel

Method used

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  • Flame-retardant polymer solid electrolyte material and electrolyte membrane and application thereof
  • Flame-retardant polymer solid electrolyte material and electrolyte membrane and application thereof
  • Flame-retardant polymer solid electrolyte material and electrolyte membrane and application thereof

Examples

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Embodiment 1

[0025] A flame-retardant polymer solid electrolyte material, comprising: 60% flame-retardant water-based polyurethane, 35% lithium trifluoromethanesulfonate and 5% nano-α-alumina; the flame-retardant polymer solid electrolyte material is prepared When forming an electrolyte membrane, it includes: stirring the flame-retardant water-based polyurethane and nano-α-alumina according to the above weight percentage to obtain a mixed solution, adding lithium trifluoromethanesulfonate to the mixed solution, stirring evenly to obtain a casting solution, and mixing the The casting solution is cast in a mold, and dried at 40° C. for 48 hours in a vacuum state to obtain the electrolyte membrane;

[0026] Wherein, the flame-retardant water-based polyurethane is synthesized by the following method: mix 35 parts of polyadipate-1,4-butylene glycol ester diol and 40 parts of isophorone diisocyanate in parts by weight, and mix them at 80° C. Lower the prepolymerization reaction for 2 hours, then...

Embodiment 2

[0029]A flame-retardant polymer solid electrolyte material, comprising: flame-retardant water-based polyurethane 80%, bistrifluoromethanesulfonimide lithium 15% and nanometer α-alumina 5%; the flame-retardant polymer solid When the electrolyte material is prepared into an electrolyte membrane, it includes: stirring the flame-retardant water-based polyurethane and nano-α-alumina according to the above weight percentage to obtain a mixed solution, adding lithium bistrifluoromethylsulfonimide to the mixed solution, and stirring evenly to obtain Casting solution, casting the casting solution in a mold, drying at 100°C for 12 hours in a vacuum state, to obtain the electrolyte membrane;

[0030] The flame-retardant water-based polyurethane is synthesized by the following method: mix polycaprolactone diol, 65 parts, and hexamethylene diisocyanate 10 parts by weight, prepolymerize at 90°C for 1 hour, and then add two 10 parts of hydroxymethyl butyric acid, 6 parts of 1,4-butanediol, 2...

Embodiment 3

[0033] A flame-retardant polymer solid electrolyte material, comprising: 70% flame-retardant water-based polyurethane, 29% lithium bisfluorosulfonimide and 1% nano-α-alumina by weight percentage; the flame-retardant polymer solid electrolyte material is prepared Forming the electrolyte membrane includes: stirring the flame-retardant water-based polyurethane and nano-α-alumina according to the above weight percentage to obtain a mixed solution, adding lithium bisfluorosulfonyl imide to the mixed solution, stirring evenly to obtain a casting solution, and mixing the The casting solution is cast in a mold, and dried at 60° C. for 20 hours in a vacuum state to obtain the electrolyte membrane;

[0034] Wherein, the flame-retardant water-based polyurethane is synthesized by the following method: mix 50 parts of polycarbonate diol and 25 parts of toluene diisocyanate in parts by weight, prepolymerize at 85°C for 1.5 hours, and then add dimethylol 6 parts of propionic acid, 9 parts of...

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Abstract

The invention provides a flame-retardant polymer solid electrolyte material and an electrolyte membrane and application thereof. The solid electrolyte material is prepared from, by weight, 60-80% of flame-retardant waterborne polyurethane, 15-35% of lithium salt, and 1-5% of nano alumina. The preparation method of the electrolyte membrane comprises the following steps: stirring flame-retardant waterborne polyurethane and nano aluminum oxide to obtain a mixed solution, adding a lithium salt into the mixed solution, uniformly stirring to obtain a membrane casting solution, casting the membrane casting solution into a mold, and drying to form the membrane, thereby obtaining the electrolyte membrane. The electrolyte material disclosed by the invention adopts flame-retardant waterborne polyurethane as a matrix, so that the solid electrolyte is endowed with high ionic conductivity under a low-temperature condition, has heat-resistant, flame-retardant and stable properties, meanwhile, avoidsusing an organic solvent, and is low in environmental pollution.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a flame-retardant polymer solid-state electrolyte material and its electrolyte membrane and application. Background technique [0002] Lithium-ion batteries have been widely used due to their high energy density, long cycle life, high open circuit voltage, no memory effect, safety and no pollution. The internal structure of commercially available lithium-ion batteries generally includes: a positive electrode and a negative electrode, a liquid electrolyte containing lithium salts, and an ion-exchange membrane separating the positive and negative electrodes. [0003] The research and development of solid-state electrolytes for lithium-ion batteries has been around for about 20 years, and they are divided into two types, one is an organic polymer electrolyte, and the other is an inorganic electrolyte. Non-organic electrolytes have the characteristics of high conductivity,...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor 魏茂彬李淑梅刘洪波孟祥伟张小龙
Owner JILIN NORMAL UNIV
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