A kind of garnet type solid-state composite electrolyte, preparation method and application

A composite electrolyte, garnet-type technology, applied in the field of lithium battery electrolyte materials, can solve the problems of unreached electrical conductivity, high interface impedance, cumbersome preparation methods, etc., to avoid lithium dendrites, good high temperature resistance, and easy to obtain raw materials Effect

Active Publication Date: 2022-03-11
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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  • A kind of garnet type solid-state composite electrolyte, preparation method and application
  • A kind of garnet type solid-state composite electrolyte, preparation method and application
  • A kind of garnet type solid-state composite electrolyte, preparation method and application

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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 an application thereof, and belongs to the technical field of lithium battery electrolyte materials. The composite electrolyte is composed of a lithium salt, an ionic liquid and a garnet-type oxide electrolyte of the LLZO system. 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 evenly attached to the surface of the solid skeleton. form an interconnected network structure. The ionic liquid electrolyte is obtained by completely dissolving the lithium salt in the ionic liquid under nearly anhydrous and oxygen-free conditions; then adding a garnet-type oxide electrolyte and mixing uniformly by ball milling to obtain the composite electrolyte. The composite electrolyte has good thermal stability, good interfacial compatibility with electrodes, low interfacial impedance and excellent electrochemical performance; the preparation method is simple and easy to operate, and the raw materials are readily available and safe and pollution-free. Use conventional equipment, 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 Patents(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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