Solid polymer electrolyte membrane and preparation method thereof

A technology of solid polymers and electrolyte membranes, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of poor ionic conductivity and mechanical properties, improve room temperature ionic conductivity, and improve electrochemical stability , Improve the effect of mechanical properties and chemical stability

Active Publication Date: 2020-10-13
东莞格林德能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the polymer solid-state electrolyte is composed of a complex of organic polymer and lithium salt, but its ionic conductivity and mechanical properties are poor, which limits its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A solid polymer electrolyte membrane and a preparation method thereof, wherein the solid polymer electrolyte membrane is composed of a polymer and a lithium salt, and the preparation method comprises the following steps:

[0024] S1: Under the protection of nitrogen or inert gas, add 10% amino-terminated polyimide oligomer and isocyanate-terminated polyurethane prepolymer to N-methylpyrrolidone, and react fully at room temperature to obtain polyurethane / polymer imide solution;

[0025] S2: Add 10wt% lithium bis(trifluoromethylsulfonyl)imide to the S1 polyurethane / polyimide solution, stir evenly to obtain a mixed solution;

[0026] S3: The mixed solution in S2 is evenly coated on a glass plate, and then dried in a vacuum oven for 24 hours.

Embodiment 2

[0028] A solid polymer electrolyte membrane and a preparation method thereof, wherein the solid polymer electrolyte membrane is composed of a polymer and a lithium salt, and the preparation method comprises the following steps:

[0029] S1: Under the protection of nitrogen or inert gas, add 10% amino-terminated polyimide oligomer and isocyanate-terminated polyurethane prepolymer to N-methylpyrrolidone, and react fully at room temperature to obtain polyurethane / polymer imide solution;

[0030] S2: Add 20wt% lithium bis(trifluoromethylsulfonyl)imide to the S1 polyurethane / polyimide solution, and stir evenly to obtain a mixed solution;

[0031] S3: The mixed solution in S2 is evenly coated on a glass plate, and then dried in a vacuum oven for 24 hours.

Embodiment 3

[0033] A solid polymer electrolyte membrane and a preparation method thereof, wherein the solid polymer electrolyte membrane is composed of a polymer and a lithium salt, and the preparation method comprises the following steps:

[0034] S1: Under the protection of nitrogen or inert gas, add 10% amino-terminated polyimide oligomer and isocyanate-terminated polyurethane prepolymer to N-methylpyrrolidone, and react fully at room temperature to obtain polyurethane / polymer imide solution;

[0035] S2: Add 30wt% lithium bis(trifluoromethylsulfonyl)imide to the S1 polyurethane / polyimide solution, stir evenly to obtain a mixed solution;

[0036] S3: The mixed solution in S2 is evenly coated on a glass plate, and then dried in a vacuum oven for 24 hours.

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Abstract

The invention discloses a solid polymer electrolyte membrane and a preparation method thereof. The solid polymer electrolyte membrane is composed of a polymer and a lithium salt, and the preparation method comprises the following steps: S1, preparing a polyurethane/polyimide solution; S2, preparing a polyurethane/polyimide/lithium salt mixed solution; and S3, coating to form a film, and drying toobtain the electrolyte membrane. Polyimide is adopted to modify polyether polyurethane, a molecular chain contains more ether groups, the room-temperature ionic conductivity is improved, sulfuryl anda fluorine-containing structure are introduced into the polymer molecular chain, the electrochemical stability of the polymer electrolyte can be effectively improved, the dissociation degree of lithium salt is improved to a certain extent, and the ionic conductivity of the polymer electrolyte is improved. Meanwhile, polyether polyurethane provides toughness for the polymer electrolyte membrane, polyimide provides rigidity for the polymer electrolyte membrane, and the mechanical property and the chemical stability of the electrolyte membrane are improved.

Description

technical field [0001] The invention belongs to the technical field of solid lithium ion batteries, and in particular relates to a solid polymer electrolyte membrane and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, low self-discharge rate, and no pollution. They are widely used in 3C products, new energy electric vehicles, electric bicycles, etc. Currently used commercial lithium-ion batteries generally use lithium hexafluorophosphate (LiPF 6 ) organic carbonate liquid electrolyte, and this type of battery contains volatile and flammable liquid organic compounds, so there are safety hazards such as leakage, fire, explosion, etc. When the battery is subjected to thermal shock, overcharge, overdischarge, short circuit Under such circumstances, security risks are more likely to occur. [0003] In view of this, enterprises and universities are currently focu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 田军李国敏
Owner 东莞格林德能源有限公司
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