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

A solid electrolyte and gel technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of prolonging the overall production time, complicated process, and long processing time, and achieve the solution of decreased ion conductivity, simple and effective process, The effect of consistency improvement

Active Publication Date: 2022-07-12
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 gelation of solid electrolyte, preparation method of solid electrolyte, and solid electrolyte
  • Method for improving discoloration and gelation of solid electrolyte, preparation method of solid electrolyte, and solid electrolyte
  • Method for improving discoloration and gelation 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 the discoloration and gelation of solid electrolyte solid electrolyte, and the method includes:

[0058] 1. Take 500μL, 1mol / L of hydrochloric acid and add it to 50mL of alcohol, dilute it into 0.01mol / L acid solution, and then add 5g LLZTO to the solution. The quality 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 , and sonicated for 10 min. After sonication, the alcohol and oxide electrolytes were separated using suction filtration. Then, the treated LLZTO was obtained by drying at 100 °C for 12 h.

[0059] 2. Add 0.1 g of the treated LLZTO powder to 8 mL of NMP (N-methylpyrrolidone) and sonicate for 10 min to ensure that the LLZTO powder is uniformly dispersed in NMP.

[0060] 3. Add 0.33g LiTSI and 1g PVDF to the above LLZTO / NMP dispersion, and stir magnetically for 12h to ensure that the above materials form a uniform glue...

Embodiment 2

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

[0067] 1. Take 5 μL of hydrochloric acid (1 mol / L), add 0.1 g of LLZTO to 8 mL 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, ultrasonically disperse it for 10 minutes, and simultaneously remove the residual alkali by an acid-base reaction.

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

[0069] 3. Use a doctor blade to coat the above glue solution on the surface of the glass plate with a thickness of 400 μm. After the blade coating is completed, the glass plate is placed in a vacuum drying oven, dried at 60° C. for 12 h, and the NMP solvent is removed to obtain an organic / inorganic composite electrolyte.

[0070] T...

Embodiment 3

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

[0075] table 3

[0076]

[0077] Note: The numbers in the table represent parallel experiments under the conditions of Comparative Example 1.

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Abstract

The invention discloses a method for improving the discoloration and gelation of the solid electrolyte and the solid electrolyte and the solid electrolyte. The method includes: mixing inorganic solid electrolyte, lithium salt, PVDF and organic solvent I to prepare a glue solution, the surface of the inorganic solid electrolyte has residual alkali, and before preparing the glue solution, the inorganic solid state is treated with a solution of an acidic substance. The electrolyte is pretreated, or acid is added during the mixing process. The method of the invention effectively solves the problems of uneven coating caused by discolored gel and the like and the decrease of lithium ion conductivity, improves the coating uniformity when the glue solution is used for coating, and the solid electrolyte obtained after coating and drying ionic conductivity.

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

Claims

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Application Information

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Patent Type & Authority Patents(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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