A kind of improved method of garnet type solid electrolyte

A solid electrolyte, garnet-type technology, applied in the field of energy material preparation and electrochemistry, can solve the problems of no prospect of large-scale application, difficulty in meeting battery power density, limited improvement in electrochemical performance, etc., and is conducive to large-scale High production, high utilization rate, avoidance of side reactions

Active Publication Date: 2021-06-01
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can improve the electrochemical performance of garnet-type electrolytes, but it consumes a lot of energy and loses a lot of lithium sources, so it does not have the prospect of large-scale industrial application
In addition, there is no intermediate layer between metal lithium and garnet electrolyte to regulate the deposition behavior of metal lithium, the electrochemical performance is limited, and it is difficult to meet the requirements of battery power density.
[0005] Therefore, it is imminent to develop a simple and feasible method for treating the surface and interface components of garnet-type solid electrolytes, and to improve the electrochemical performance of batteries at high current densities, but there are great challenges

Method used

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  • A kind of improved method of garnet type solid electrolyte
  • A kind of improved method of garnet type solid electrolyte
  • A kind of improved method of garnet type solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Processing LLZTO ceramic sheets

[0038] Prepare the treatment solution: Dissolve 10 mg of ammonium fluoride in 10 ml of isopropanol.

[0039] Treatment of ceramic sheets: Take 10 microliters of treatment solution, apply it on the surface of LLZTO ceramic sheets, the thickness of the liquid film is 100 microns, and then conduct a heating reaction at 400 degrees Celsius.

[0040] The treated LLZTO ceramic sheet is detected by Raman spectroscopy, and the obtained garnet-type solid electrolyte does not contain LiCO 3 . The wettability was observed in contact with molten metal lithium, and it was found that metal lithium could spread evenly on the modified surface.

[0041] 2. Assemble the full battery

[0042] Preparation of lithium iron phosphate cathode material: mix lithium iron phosphate, conductive carbon black, and polyvinylidene chloride at a mass ratio of 8:1:1, then add N-methylpyrrolidone to make a uniform slurry, and evenly coat it on aluminum foil On the...

Embodiment 2

[0045] Other steps are the same as in Example 1, the difference is that ammonium fluoride is replaced by ammonium chloride, and the obtained garnet-type solid electrolyte does not contain LiCO after detection by Raman spectroscopy. 3 .

Embodiment 3

[0047] Other steps are the same as in Example 1, the difference is that ammonium fluoride is replaced by ammonium bromide, and after Raman spectroscopy detection, the obtained garnet-type solid electrolyte does not contain LiCO 3 .

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Abstract

The invention provides an improved method for a garnet-type solid electrolyte, which is applied to a solid-state lithium battery. The improved method is to coat acidic substances and / or ammonium salts on the surface of the garnet-type solid electrolyte, and react at 0-500°C for 0-2h, so that the pollutants are removed and even converted into metal lithium Uniform deposition of useful substances. Moreover, the obtained garnet-type solid electrolyte has improved stability in air. The treatment method is simple and easy, reduces the cost of solid-state batteries based on ceramic electrolytes, and the final product is conducive to the uniform deposition of metal lithium, which can improve the electrochemical performance of batteries, and has broad application prospects and advantages.

Description

technical field [0001] The invention belongs to the fields of energy material preparation and electrochemistry, and in particular relates to a method for improving the surface composition of garnet-type ceramic electrolytes and its application in metal lithium batteries. Background technique [0002] In recent years, with the continuous development of electric vehicles and energy storage science, people have put forward higher requirements for lithium-ion batteries with high energy density, high safety, and low cost. The development of commercial lithium-ion batteries with graphite as the negative electrode is about to reach the theoretical limit, and it is difficult to meet the requirements for high energy density. Therefore, it is necessary to develop new system batteries with higher energy density. Lithium metal has attracted extensive research by researchers due to its ultra-high energy density and low chemical potential. Lithium-ion batteries with liquid electrolytes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0562
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 郭玉国段惠万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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