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Garnet type solid-state composite electrolyte, preparation method and application

A composite electrolyte and garnet-type technology, applied in the field of lithium battery electrolyte materials, can solve the problems of high interface impedance, cumbersome preparation methods, and unreachable electrical conductivity

Active Publication Date: 2020-10-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method is cumbersome, and the interface impedance between the electrode and the electrode is high, and the conductivity has not yet reached the ideal requirements for application in lithium batteries (J.Power Sources.2015,274:458-463)

Method used

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  • Garnet type solid-state composite electrolyte, preparation method and application
  • Garnet type solid-state composite electrolyte, preparation method and application
  • Garnet type solid-state composite electrolyte, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) In a glove box filled with argon gas with a purity of ≥99% and a moisture content of less than 0.1ppm, weigh 2.2966g of lithium bistrifluoromethanesulfonylimide to 13.9g of N-methyl, propylpyrrolidine bistris In the fluoromethanesulfonylimide salt, stir until the lithium salt is completely dissolved to obtain an ionic liquid electrolyte;

[0043] (2) Weigh 1g of garnet-type oxide electrolyte Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Put it into the ball mill jar, then add 0.25g of ionic liquid electrolyte, seal the ball mill jar and mill for 4h, the speed is 300r min -1 Take out the material after ball milling to obtain a garnet-type solid-state composite electrolyte according to the present invention;

[0044] LiFePO 4 As an active electrode material, it is assembled with the garnet-type solid-state composite electrolyte prepared in this example to form a CR2025 lithium secondary battery, and then the electrochemical performance test is performed under constant current ...

Embodiment 2

[0055] (1) In a glove box filled with argon gas with a purity of ≥99% and a moisture content of less than 0.1ppm, weigh 2.8708g of lithium bistrifluoromethanesulfonylimide to 13.9g of N-methyl, propylpyrrolidine bistrifluoro In the methanesulfonylimide salt, stir until the lithium salt is completely dissolved to obtain an ionic liquid electrolyte;

[0056] (2) Weigh 1g of garnet-type oxide electrolyte Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Put it into the ball mill jar, then add 0.25g of ionic liquid electrolyte, seal the ball mill jar and mill for 4h, the speed is 300r min -1 Take out the material after ball milling to obtain a garnet-type solid-state composite electrolyte according to the present invention;

[0057] LiFePO 4 As an active electrode material, it is assembled with the garnet-type solid-state composite electrolyte prepared in this example to form a CR2025 lithium secondary battery, and then the electrochemical performance test is performed under constant current c...

Embodiment 3

[0068] (1) In a glove box filled with argon gas with a purity of ≥99% and a moisture content of less than 0.1ppm, weigh 3.4450g lithium bistrifluoromethanesulfonylimide to 13.9g N-methyl, propylpyrrolidine bistrifluoro In the methanesulfonylimide salt, stir until the lithium salt is completely dissolved to obtain an ionic liquid electrolyte;

[0069] (2) Weigh 1g of garnet-type oxide electrolyte Li 6.5 La 3 Zr 1.4 Ta 0.6 o 12 Put it into the ball mill jar, then add 0.25g of ionic liquid electrolyte, seal the ball mill jar and mill for 4h, the speed is 300r min -1 Take out the material after ball milling to obtain a garnet-type solid-state composite electrolyte according to the present invention;

[0070] LiFePO 4 As an active electrode material, it is assembled with the garnet-type solid-state composite electrolyte prepared in this example to form a CR2025 lithium secondary battery, and then the electrochemical performance test is performed under constant current charge ...

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Abstract

The invention relates to a garnet type solid-state composite electrolyte, a preparation method and application, and belongs to the technical field of lithium battery electrolyte materials. The composite electrolyte is composed of a lithium salt, an ionic liquid and an LLZO-system garnet-type oxide electrolyte. The garnet-type oxide electrolyte is used as a solid skeleton, and the ionic liquid electrolyte formed by mixing the lithium salt and the ionic liquid is uniformly attached to the surface of the solid skeleton to form a cross-linked network structure. The preparation method comprises thefollowing steps: completely dissolving a lithium salt into ionic liquid under a near-anhydrous and oxygen-free condition to obtain an ionic liquid electrolyte; and adding the garnet type oxide electrolyte, and carrying out ball milling and uniform mixing to obtain the composite electrolyte. The composite electrolyte has good thermal stability, good interfacial compatibility with an electrode, relatively low interfacial impedance and excellent electrochemical performance. The preparation method is simple and easy to operate, raw materials are easy to obtain, safe and pollution-free, conventional equipment is used, and the method is suitable for large-scale production.

Description

technical field [0001] The present invention relates to a garnet-type solid-state composite electrolyte, its preparation method and application, in particular to a high-strength, high-safety garnet-type solid-state composite electrolyte, its preparation method and its application, belonging to lithium battery electrolyte materials technology field. Background technique [0002] Electrolytes are an important part of batteries. With the sharp increase in the demand for high-safety rechargeable batteries in the fields of large-scale energy storage and new energy vehicles, people began to focus on the research of solid-state electrolytes, because solid-state electrolytes are liquid-free solvent systems with high It has the advantages of energy density, wide working temperature and high elastic modulus. It is non-volatile and non-flammable, and can effectively solve the problem of lithium dendrites in lithium batteries and improve the safety performance of batteries. Compared w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052
CPCH01M10/056H01M10/052H01M2300/0085H01M2300/0091Y02E60/10
Inventor 陈人杰李月姣闫明霞屈雯洁陈实邢易温子越吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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