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Preparation method of composite electrolyte sheet

A composite electrolyte, alumina sheet technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as difficult operation, difficulty, and inability to practical application, and achieve improved strength, low ion resistance, and excellent performance. Effect

Active Publication Date: 2015-05-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the thickness of the most widely used commercialized LTAP electrolyte sheet (Ohara, Japan) is only 150 μm, and it is very difficult to further reduce it, because the thinner the ceramic electrolyte sheet, the more fragile it is, making it difficult to handle and impossible. practical application
How to make the ceramic electrolyte sheet thin enough and have enough mechanical strength is a big challenge

Method used

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  • Preparation method of composite electrolyte sheet
  • Preparation method of composite electrolyte sheet
  • Preparation method of composite electrolyte sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A method for preparing a composite electrolyte sheet, comprising the following steps:

[0022] 1) Preparation of honeycomb alumina sheet: prepared by freeze-casting method, weighing 85.0g of alumina powder, adding 100.0g of tert-butanol, 0.5g of PVB powder, 4.5g of BYK163 dispersant, 4.0g of deionized water g, ball milled for 4 hours, vacuumize the obtained slurry to defoam and pour it into a mold. The bottom of the mold is a copper plate, and the surrounding is made of nylon plastic material. Then put it on a -70°C freezer for 5 hours, and then -40°C Vacuum freeze-drying at ℃, after demoulding, the alumina green cylinder with straight through holes is obtained, and sintered at 1720℃ for 2 hours to obtain the alumina cylinder with straight through holes, and finally cut with a low-speed precision cutting machine to obtain a thickness of 1mm and a diameter of 19mm Honeycomb alumina sheet, with an average pore size of 61 μm and a porosity of 64%;

[0023] 2) Preparation ...

Embodiment 2

[0033] A method for preparing a composite electrolyte sheet, comprising the following steps:

[0034] 1) Preparation of honeycomb alumina sheet: prepared by freeze-casting method, weighing 100.0g of alumina powder, adding 100.0g of tert-butanol, 0.6g of PTFE powder, 5.0g of triolein dispersant, 4.0g of deionized water, ball milled for 6 hours, inject the obtained slurry into the mold, the bottom of the mold is a copper plate, and the surrounding is made of nylon plastic material, and then put them together on the freezing table, freeze and shape on the freezing table at -100°C for 5 hours, Then vacuum freeze-dry at -40°C. After demoulding, the alumina green cylinder with straight through holes is obtained. Sinter at 1680°C for 4 hours to obtain the alumina cylinder with straight through holes. Finally, cut it with a low-speed precision cutting machine to obtain a thickness of 1mm. 1. A honeycomb aluminum oxide sheet with a diameter of 19mm, an average pore diameter of 46μm, an...

Embodiment 3

[0039] A method for preparing a composite electrolyte sheet, comprising the following steps:

[0040] 1) Preparation of honeycomb alumina sheet: prepared by freeze-casting method, weighing 85.0g of alumina powder, adding 100.0g of tert-butanol, 0.5g of PVB powder, 4.5g of BYK163 dispersant, 4.0g of deionized water g, ball milled for 4 hours, vacuumize the obtained slurry to defoam and pour it into a mold. The bottom of the mold is a copper plate, and the surrounding is made of nylon plastic material. Then put it on a -70°C freezer for 5 hours, and then -40°C Vacuum freeze-drying at ℃, after demoulding, the alumina green cylinder with straight through holes is obtained, and sintered at 1720℃ for 2 hours to obtain the alumina cylinder with straight through holes, and finally cut with a low-speed precision cutting machine to obtain a thickness of 1mm and a diameter of 19mm Honeycomb alumina sheet, with an average pore size of 61 μm and a porosity of 64%;

[0041] 2) Preparation ...

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Abstract

The invention discloses a preparation method of a composite electrolyte sheet. The preparation method comprises the following steps: preparing a honeycomb alumina sheet, namely, mixing alumina powder, tert-butyl alcohol, an adhesive, a dispersant and deionized water, carrying out ball milling, injecting a mixture into a die, carrying out solidification, vacuum freeze-drying, sintering and cutting to obtain the honeycomb alumina sheet; then preparing LLZTO slurry, namely, weighing lithium carbonate, lanthanum oxide, zirconia and tantalum oxide, carrying out ball milling with ethanol, drying to obtain a premix, carrying out heat treatment on the premix to obtain preheated powder, mixing the preheated powder, ethyl glycol, the adhesive and triolein, and carrying out ball milling to obtain the LLZTO slurry; and finally, preparing the composite electrolyte sheet with a honeycomb alumina supported LLZTO membrane, namely, coating the LLZTO slurry on one surface of the honeycomb alumina sheet, naturally drying, putting on a crucible lid, and sintering to obtain the composite electrolyte sheet. According to the preparation method disclosed by the invention, the prepared composite electrolyte is excellent in performance and has wide application prospect in the field of lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of solid lithium ion electrolyte materials, and in particular relates to a preparation method of a composite electrolyte sheet. Background technique [0002] According to the type of electrolyte used, common lithium battery systems can be divided into non-aqueous lithium batteries, water-based lithium batteries, mixed electrolyte lithium batteries, and all-solid lithium batteries. Capacity and high voltage, but also bring some problems. On the one hand, lithium is a very active metal, and it will react violently or even explode when it comes in contact with air or water. On the other hand, during the charging process, due to uneven deposition, lithium dendrites are easily formed on the surface of metal lithium; if the growth of lithium dendrites reaches the positive electrode, it is easy to cause a short circuit inside the battery, which brings serious safety hazards. This requires electrolyte / separator ma...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10
Inventor 汪长安刘凯
Owner TSINGHUA UNIV
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