Surface treatment method for garnet type solid electrolyte

A solid-state electrolyte and garnet-type technology, applied in electrolytes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of impurity layer formation, achieve good dispersion, small powder particles, and increase energy density

Active Publication Date: 2021-01-29
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the garnet-type solid electrolyte reacts with water vapor and carbon dioxide in the air and easily forms an impurity layer on the surface, the invention provides a surface treatment method for the garnet-type solid electrolyte to prevent the occurrence of defects between the garnet solid electrolyte and the air. reaction, inhibiting the formation of surface impurities, while ensuring that the ionic conductivity of the electrolyte is not deteriorated, so that the electrolyte can maintain a high degree of stability and electrochemical performance during storage and use

Method used

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  • Surface treatment method for garnet type solid electrolyte
  • Surface treatment method for garnet type solid electrolyte
  • Surface treatment method for garnet type solid electrolyte

Examples

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Effect test

Embodiment 1

[0039] A surface treatment method of LLZO, comprising the steps:

[0040] (1) Preparation of ion-conducting polymer solution: dissolving polyoxyethylene-based polymer PEO and lithium bistrifluoromethylimide in acetonitrile, and preparing an ion-conducting polymer solution with a concentration of 1%;

[0041] (2) Pretreatment: The LLZO powder material with a particle size of 0.1 μm is treated at a high temperature of 500 °C for 2 hours in an argon atmosphere to obtain a pure LLZO powder with no impurities on the surface;

[0042] (3) Slurry preparation: Calculate and weigh the amount of pretreated LLZO powder material and ion-conducting polymer solution according to the coating thickness of 1nm, and add the pre-treated LLZO powder to the ion-conducting polymer solution In the process of ultrasonic dispersion, a uniform slurry is obtained;

[0043] (4) Finished product preparation: use a closed centrifugal spray dryer to dry the slurry, and form an ion-conducting polymer coatin...

Embodiment 2

[0046] A surface treatment method of LLZTO, comprising the steps:

[0047] (1) Preparation of ion-conducting polymer solution: dissolving polyoxyethylene-based polymer PEO and lithium bisfluorosulfonimide in acetone, and preparing an ion-conducting polymer solution with a concentration of 2%;

[0048] (2) Pretreatment: ① Treat the LLZTO powder material with a particle size of 10 μm at a high temperature of 1500 °C for 2 hours in an argon atmosphere to obtain a pure LLZTO powder with no impurities on the surface;

[0049] (3) Slurry preparation: Calculate and weigh the amount of pretreated LLZTO powder material and ion-conducting polymer solution according to the coating thickness of 50nm, and add the pre-treated LLZTO powder to the ion-conducting polymer solution In, the slurry is stirred uniformly;

[0050] (4) Finished product preparation: use a closed centrifugal spray dryer to dry the slurry, and form an ion-conductive polymer coating layer with a thickness of 50nm on the...

Embodiment 3

[0053] A surface treatment method of LLGNZO, comprising the steps:

[0054] (1) Preparation of ion-conducting polymer solution: dissolving polysiloxane-based polymer PDMS and lithium perchlorate in ethanol, and preparing an ion-conducting polymer solution with a concentration of 1.5%;

[0055] (2) Pretreatment: The LLGNZO powder material with a particle size of 1 μm is subjected to a high temperature treatment at 1000°C for 2 hours in an argon atmosphere to obtain a pure LLGNZO powder with no impurities on the surface;

[0056] (3) Slurry preparation: Calculate and weigh the amount of pretreated LLGNZO powder material and ion-conducting polymer solution according to the thickness of the coating layer of 20nm, and add the pre-treated LLGNZO powder to the ion-conducting polymer solution In the process of ball milling, a uniform slurry is obtained;

[0057] (4) Finished product preparation: Dry the slurry with a closed centrifugal spray dryer, and form an ion-conducting polymer ...

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Abstract

The invention belongs to the technical field of solid electrolyte preparation, and particularly relates to a surface treatment method for a garnet-type solid electrolyte. The method comprises the following steps: pretreating a garnet electrolyte powder material, and forming an ion conductive polymer coating layer with the thickness of 1-50 nm on the surface of the garnet electrolyte powder material by adopting a spray drying technology. According to the method disclosed by the invention, adverse reaction between the garnet solid electrolyte and air is prevented, the generation of surface impurities is inhibited, and meanwhile, the ionic conductivity of the electrolyte is not deteriorated, so that the electrolyte can keep high stability and electrochemical performance in the storage and useprocesses.

Description

technical field [0001] The invention belongs to the technical field of preparation of solid electrolytes, and in particular relates to a surface treatment method for garnet-type solid electrolytes. Background technique [0002] With the depletion of fossil energy and people's increasing attention to environmental protection, it is becoming more and more urgent to find clean alternative energy. Lithium battery has attracted people's attention because of its extremely high specific energy and excellent environmental friendliness. However, a flammable organic electrolyte is added to the traditional lithium battery, which makes the battery have the risk of combustion and explosion. Recently, whether it is a mobile phone or an electric vehicle, news of battery combustion and explosion has been continuously reported. Therefore, the safety issues of high-energy lithium batteries need to be solved urgently. [0003] In this regard, replacing the flammable organic electrolyte with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/052
CPCH01M10/052H01M10/0562H01M2300/0071Y02E60/10
Inventor 杨泽林康树森杨程响赵珊陈晓涛石斌刘富亮
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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