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Method for improving discoloration and gelling of solid electrolyte, preparation method of solid electrolyte and solid electrolyte

A solid electrolyte, gel technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of prolonging the overall production time, complex process, long processing time, etc., to solve the problem of decreased ionic conductivity, simple and effective process, The effect of improving consistency

Active Publication Date: 2021-05-07
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The washing method is to remove a small amount of weak base from the oxide electrolyte by washing with a large amount of organic solvent. This method takes a long time to process, prolongs the overall production time, and it is difficult to completely remove the weak base attached to the surface of the oxide electrolyte
The coating method is to coat an organic layer on the surface of the oxide electrolyte, so that the weak base cannot be in contact with the glue, thus solving the problem of discoloration gel, but such coating will have a certain impact on the ionic conductivity of the oxide electrolyte. impact, and the process is more complex

Method used

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  • Method for improving discoloration and gelling of solid electrolyte, preparation method of solid electrolyte and solid electrolyte
  • Method for improving discoloration and gelling of solid electrolyte, preparation method of solid electrolyte and solid electrolyte
  • Method for improving discoloration and gelling of solid electrolyte, preparation method of solid electrolyte and solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment provides a method for improving discoloration and gelation of a solid electrolyte solid electrolyte, the method comprising:

[0058] 1. Take 500 μL of 1mol / L hydrochloric acid and add it to 50mL of alcohol, dilute it into a 0.01mol / L acid solution, then take 5g LLZTO and add it to the solution. The mass of the acidic substance in the acid solution is the residual alkali on the surface of the inorganic solid electrolyte 1.03 times the mass of the sample, and sonicated for 10 minutes. After sonication is complete, use suction to separate the alcohol from the oxide electrolyte. Then dry at 100°C for 12 hours to obtain the treated LLZTO.

[0059] 2. Take 0.1 g of the treated LLZTO powder and add it into 8 mL of NMP (N-methylpyrrolidone), and sonicate for 10 minutes to ensure that the LLZTO powder is evenly dispersed in the NMP.

[0060] 3. Add 0.33g LiTSI and 1g PVDF to the above LLZTO / NMP dispersion, and stir it magnetically for 12 hours to ensure that th...

Embodiment 2

[0066] This embodiment provides a method for improving discoloration and gelation of a solid electrolyte solid electrolyte, the method comprising:

[0067] 1. Take 5 μL of hydrochloric acid (1mol / L), and add 0.1g of LLZTO into 8mL of NMP solvent. The mass of the acidic substance is 1.04 times the mass of the residual alkali on the surface of the inorganic solid electrolyte. Ultrasonic for 10 minutes disperses evenly, and at the same time, the acid-base reaction removes the residual alkali.

[0068] 2. Add 0.33g LiTFSI and 1g PVDF to the above LLZTO / NMP dispersion, and stir it magnetically for 12 hours to ensure that the above materials form a uniform glue.

[0069] 3. Use a scraper to coat the above-mentioned glue solution on the surface of the glass plate with a thickness of 400 μm. After scraping, the glass plate was put into a vacuum drying oven, dried at 60°C for 12 hours, and the NMP solvent was removed to obtain an organic / inorganic composite electrolyte.

[0070] Table...

Embodiment 3

[0074] The difference with Example 1 is that the volume of the alcohol used in step 1 is 20mL, under this condition, the concentration of the acid solution is 0.025mol / L, the mass of the acidic substance in the acid solution and the residual alkali on the surface of the inorganic solid electrolyte The ratio is the same as in Example 1.

[0075] table 3

[0076]

[0077] Note: the numbers in the table represent parallel experiments done according to the conditions of Comparative Example 1.

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Abstract

The invention discloses a method for improving discoloration and gelling of a solid electrolyte and the solid electrolyte. The method comprises the steps that an inorganic solid electrolyte, a lithium salt, PVDF and an organic solvent I are mixed to prepare a glue solution, residual alkali exists on the surface of the inorganic solid electrolyte, and before the glue solution is prepared, the inorganic solid electrolyte is pretreated with a solution of an acidic substance, or the acidic substance is added in the mixing process. The method provided by the invention effectively solves the problems of non-uniform coating and lithium ion conductivity reduction caused by color-changing gel and the like, improves the coating uniformity when the glue solution is used for coating, and improves the ionic conductivity of the solid electrolyte obtained after coating and drying.

Description

technical field [0001] The invention relates to the technical field of solid-state batteries, and relates to a method for improving discoloration and gelation of solid-state electrolytes, a preparation method of solid-state electrolytes, and solid-state electrolytes. Background technique [0002] Thanks to a series of state subsidy policies for the electric vehicle industry, the domestic electric vehicle market has developed rapidly. By 2025 and 2030, the energy density of a single battery should reach 400 and 500Wh / kg. However, based on the existing liquid electrolyte lithium-ion power battery system, the battery energy density and safety performance after 2025 will be difficult to meet the national requirements . Replacing traditional liquid electrolytes with non-flammable solid electrolytes can increase the energy density of batteries by about 66% while ensuring battery safety performance, so solid-state batteries are considered to be an important direction for next-gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0562H01M10/4235Y02P70/50
Inventor 陈规伟黄科程冀亚娟刘金成刘建华
Owner EVE ENERGY CO LTD
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