Interface-modified solid garnet type battery and preparation method thereof

A garnet type, interface modification technology, applied in the field of electrochemistry, to achieve the effect of improving contact, improving cycle and rate performance, and reducing interface impedance

Pending Publication Date: 2020-11-17
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a solid-state garnet-type battery and its preparation method using in-situ polymer ...

Method used

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  • Interface-modified solid garnet type battery and preparation method thereof
  • Interface-modified solid garnet type battery and preparation method thereof
  • Interface-modified solid garnet type battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] In this example, the preparation process of a solid-state garnet-type battery using an in-situ polymerized gel electrolyte for interface modification includes the following steps:

[0040] (1) Evenly disperse 0.7g of LFP positive electrode powder, 0.15g of PVDF binder and 0.15g of Super P electronic conductivity agent in NMP solvent, and magnetically stir for 2h to obtain positive electrode slurry; apply the positive electrode slurry to the current collector aluminum foil On the above, the positive electrode slurry was dried at 60°C for 48 hours to obtain the positive electrode; then the positive electrode was cut into discs with a diameter of 10mm for later use;

[0041] (2) Mix 1g ETPTA, 5g LB-303 and 0.01g AIBN, and magnetically stir for 3 hours at room temperature to obtain the precursor of the gel electrolyte;

[0042] (3) Apply 1 microliter of the precursor of the gel electrolyte to the Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 One side of the ceramic electrolyte, and t...

Embodiment 2

[0048] In this example, the preparation method of lithium manganese iron phosphate-based solid-state garnet battery using in-situ polymer gel electrolyte for interface modification is basically the same as that of Example 1, the difference is that the step (1) of this example is: 0.7g LFMP Positive electrode powder, 0.15g PVDF binder and 0.15g Super P electronic conductivity agent were evenly dispersed in NMP solvent, and magnetically stirred for 2h to obtain positive electrode slurry; the positive electrode slurry was coated on the current collector aluminum foil, and the positive electrode slurry was placed on the After drying at 60° C. for 48 hours, the positive electrode was obtained; and the positive electrode was cut into discs with a diameter of 10 mm for future use.

[0049] image 3 It is the charge-discharge curve of the manganese iron phosphate lithium-based solid-state garnet battery using the in-situ polymer gel electrolyte to modify the interface of the positive ...

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Abstract

The invention belongs to the technical field of electrochemistry, and relates to an interface-modified solid garnet type battery and a preparation method thereof. A flexible gel electrolyte intermediate layer is introduced at the interface of a positive electrode/electrolyte and a negative electrode/electrolyte of the solid garnet type battery by adopting an in-situ polymerization process, beforepolymerization, the precursor of the gel electrolyte can fully infiltrate the interface of the positive and negative electrodes and fully infiltrate the interior of the positive electrode; after polymerization, the precursor is cured in situ in the positive electrode and at the interface of the positive and negative electrodes, and a cured ion conductive network is formed in the positive electrode, so that the contact between electrodes/electrolytes is greatly improved, and the interface impedance is significantly reduced. The method is simple and easy to implement, enables the electrode/electrolyte interface impedance of the solid garnet type battery to be significantly reduced, enables the cycle performance and the rate capability of the battery to be improved, and has the very good industrial application prospect.

Description

Technical field: [0001] The invention belongs to the technical field of electrochemistry, and relates to an interface-modified solid-state garnet battery and a preparation method thereof, in particular to a solid-state garnet-type battery using an in-situ polymer gel electrolyte for interface modification and a preparation method thereof. Background technique: [0002] With the extensive use and depletion of fossil fuels, the development and effective use of green renewable energy and environmental protection have become issues of common concern worldwide. The development of secondary batteries that can realize efficient energy storage and conversion is not only related to national economic development and strategic security, but also closely related to people's lives, so it has received extensive attention at home and abroad. [0003] Lithium-ion secondary batteries have been widely used in consumer electronics due to their many advantages such as high energy density, long ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0562H01M10/0525H01M10/058H01M10/04
CPCH01M10/0565H01M10/0562H01M10/0525H01M10/058H01M10/0427H01M2300/0094Y02E60/10Y02P70/50
Inventor 郭向欣毕志杰赵宁万勇
Owner QINGDAO UNIV
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