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Composite electrolyte membrane and its preparation method and application

A technology of composite electrolyte membrane and mass ratio, which is applied in the direction of electrolyte, solid electrolyte, non-aqueous electrolyte, etc., can solve the problems of poor contact wettability of electrode materials, complex overall molding process, and limitation of practical application, so as to improve electrochemical performance, Effects of improving safety and stability and improving chain segment kinematics

Active Publication Date: 2019-06-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid-state electrolytes have become one of the ways to solve the safety of existing batteries. Inorganic solid electrolytes have the advantages of high ionic conductivity, good thermal stability, and wide electrochemical stability window. However, this type of electrolyte still has a complex overall molding process. Disadvantages such as poor contact wettability between materials
Solid polymer electrolytes are known for their excellent film-forming properties, ensuring good wetting of electrodes and low flammability. However, the polymer matrix usually has high crystallinity and low ionic conductivity at room temperature. (10 -7 ~10 -8 S / cm), which limits its practical application

Method used

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  • Composite electrolyte membrane and its preparation method and application
  • Composite electrolyte membrane and its preparation method and application
  • Composite electrolyte membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A kind of composite electrolyte membrane, this composite electrolyte membrane is a gel state composite electrolyte membrane, is made of SiO 2 , polyvinylidene fluoride hexafluoropropylene [P(VDF-HFP)], lithium bis(trifluoromethylsulfonyl)imide (LiTFSI), bis(trifluoromethylsulfonyl) 1-ethyl-3-methyl Made of imidazole (EMITFSI), among which P(VDF-HFP), LiTFSI, EMITFSI, SiO 2 The mass ratio is 1:1:1.4:0.2.

[0050] A method for preparing the composite electrolyte membrane in the above-mentioned embodiment, comprising the following steps:

[0051] (1) Add P(VDF-HFP) into methyl ethyl ketone, and magnetically stir at 50°C for 30 min to obtain a polyvinylidene fluoride hexafluoropropylene solution with a mass fraction of 6.7%.

[0052] (2) Under the protection of argon atmosphere, according to P(VDF-HFP), LiTFSI, EMITFSI, SiO 2 The mass ratio is 1:1:1.4:0.2, respectively weigh the polyvinylidene fluoride hexafluoropropylene solution, LiTFSI, EMITFSI and SiO 2 , then mix t...

Embodiment 2

[0054] A composite electrolyte membrane, the composite electrolyte membrane is a solid composite electrolyte membrane, made of Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP), polyvinylidene fluoride hexafluoropropylene [P(VDF-HFP)], lithium bis(trifluoromethylsulfonyl)imide (LiTFSI), bis(trifluoromethylsulfonyl)1-ethyl- 3-Methylimidazole (EMITFSI), wherein the mass ratio of P(VDF-HFP), LiTFSI, EMITFSI, LAGP is 1:1:1.4:1.

[0055] A method for preparing the composite electrolyte membrane in the above-mentioned embodiment, comprising the following steps:

[0056] (1) Preparation of LAGP: Molar percentage, Li 2 CO 3 、GeO 2 、Al 2 o 3 , NH 4 h 2 PO 4 19.75%: 37.04%: 6.17%: 37.04%, weigh Li 2 CO 3 、GeO 2 、Al 2 o 3 and NH 4 h 2 PO 4 , and then put them in an agate ball mill jar and grind them evenly, put them into a platinum crucible and heat them to 700°C, keep them warm for 1h, then raise the temperature to 1500°C at 5°C / min, keep them warm for 2h, and cool them rapidly ...

Embodiment 3

[0060] A composite electrolyte membrane, the composite electrolyte membrane is a solid composite electrolyte membrane, made of Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP), polyvinylidene fluoride hexafluoropropylene [P(VDF-HFP)], lithium bis(trifluoromethylsulfonyl)imide (LiTFSI), bis(trifluoromethylsulfonyl)1-ethyl- Made of 3-methylimidazole (EMITFSI), wherein the mass ratio of P(VDF-HFP), LiTFSI, EMITFSI, and LAGP is 1:1:1.4:1.5.

[0061] A method for preparing the composite electrolyte membrane in the above-mentioned embodiment, comprising the following steps:

[0062] (1) Preparation of LAGP: Same as Example 2.

[0063] (2) Add P(VDF-HFP) into methyl ethyl ketone and magnetically stir at 50°C for 30 min to obtain a polyvinylidene fluoride hexafluoropropylene solution with a mass fraction of 6.7%.

[0064] (3) Under the protection of argon atmosphere, according to the mass ratio of P(VDF-HFP), LiTFSI, EMITFSI, LAGP is 1:1:1.4:1.5, respectively weigh the polyvinylidene fluor...

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Abstract

The invention discloses a composite electrolyte membrane and a preparation method and application thereof. The composite electrolyte membrane is a gel-state composite electrolyte membrane or a solid-state composite electrolyte membrane. The preparation method of the composite electrolyte membrane comprises the following steps of adding a macromolecular polymer material into an organic solvent, and performing stirring to obtain a macromolecular polymer material solution; and adding inertia inorganic solid filler and / or active inorganic solid filler, a lithium salt and an ionic liquid, and performing ultrasonic dispersion, stirring, standing and drying to obtain the composite electrolyte membrane. The composite electrolyte membrane has the advantages of high thermal stability, high electrochemical stability, good ionic conductivity, good interface adhesion tightness and the like, is easy to form and can be completely in contact with an electrode material; the preparation method has the advantages of simple process and the like, continuous production can be achieved; and the composite electrolyte membrane can be applied to a solid-state battery, and the solid-state battery shows relatively good cycle stability and rate performance.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolyte membranes, and relates to a composite electrolyte membrane and its preparation method and application, in particular to a composite electrolyte membrane, its preparation method and its application in solid-state batteries. Background technique [0002] Due to the demand of electronic products and electric vehicles, and with the current shortage of energy supply, lithium-ion batteries have become a research hotspot and have been widely used. At present, lithium-ion batteries based on organic liquid electrolytes occupy a major share of the battery market, but potential safety issues restrict their application in new batteries with high energy density. Solid-state electrolytes have become one of the ways to solve the safety of existing batteries. Inorganic solid electrolytes have the advantages of high ionic conductivity, good thermal stability, and wide electrochemical stability window. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/42H01M10/0525
CPCH01M10/0525H01M10/056H01M10/4235H01M2300/0068H01M2300/0082H01M2300/0085H01M2300/0091Y02E60/10
Inventor 韩喻郭青鹏王珲刘双科郑春满洪晓斌李德湛谢凯
Owner NAT UNIV OF DEFENSE TECH
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