Preparation method for garnet type solid electrolyte material

A solid electrolyte, garnet-type technology, applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems affecting the electrical performance of all-solid-state batteries, the thickness of the electrolyte sheet, etc., to achieve a small shape, low impedance, not easy to break Effect

Inactive Publication Date: 2017-07-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a method for preparing a garnet-type solid electrolyte material to solve the problem that the thickness of the electrolyte sheet is relatively thick when the existing all-solid electrolyte sheet preparation method is used to prepare the electrolyte sheet, and it will affect the overall performance of the electrolyte sheet. The problem of electrical performance of solid-state batteries

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  • Preparation method for garnet type solid electrolyte material
  • Preparation method for garnet type solid electrolyte material
  • Preparation method for garnet type solid electrolyte material

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preparation example Construction

[0027] An embodiment of the present invention provides a method for preparing a garnet-type solid electrolyte material, comprising the following steps:

[0028] Step S1: Mix the garnet type electrolyte powder, binder and solvent to obtain electrolyte slurry.

[0029] The garnet type electrolyte is a garnet type lithium ion conductor, preferably, the garnet type lithium ion conductor includes Li 3 + x ln 3 Te 2-x m x o 12 , where 0≤x≤2, Ln is one or more of La, Y, Pr, Nd, Sm, Lu, etc., M is one or more of Nb, Ta, Bi, Sb, etc. May also include Li 5 + x ln 3-x A x m 2 o 12 , where 0≤x≤3, Ln is one or more of La, Y, Pr, Nd, Sm, Lu, etc., A is one or more of Mg, Ca, Sr, Ba, etc., M is One or more of Nb, Ta, Bi, Sb. can also include Li δ + x-3y ln 3-x A x m 2 B y o 12±λ Among them, δ and λ are positive integers, determined by the valence state of B element, 6≤δ≤7, 0≤λ≤1, 0≤x≤3, 0≤y≤2, Ln is La, Pr, Nd, Sm, One or more of Lu, etc., A is one or more of Mg, Ca, Sr,...

Embodiment 1

[0041] Dissolve PVB (polyvinyl butyral) in toluene to prepare a binder with a mass fraction of 10%. Then the garnet Li 7 La 3 Zr 2 o 12 (LLZO) Electrolyte powder is added to the binder. Using a dispersing emulsifier to stir and disperse the above electrolyte slurry evenly to obtain a uniform electrolyte slurry. The degassed electrolyte slurry is uniformly coated on a PET (polyethylene terephthalate) film by using an automatic coating machine to obtain a uniform and soft electrolyte film. The electrolyte film was removed from the PET film, and the film was cut into electrolyte sheets with a diameter of 25 mm. By pressing and firing, the cut electrolyte film was placed in an Ar gas-protected debinding box, and sintered at 1200 °C for 6 hours to discharge the binder in the electrolyte film and obtain a dense garnet-type Li 7 La 3 Zr 2 o 12 (LLZO) electrolyte sheet.

[0042] Use carbon as a blocking electrode to test its conductivity, and the AC impedance spectrum is as ...

Embodiment 2

[0044] PVDF (polyvinylidene fluoride) was dissolved in NMP (N-methylpyrrolidone) to prepare a binder with a mass fraction of 5%. Then the garnet Li 7 La 3 Zr 2 o 12 (LLZO) Electrolyte powder is added to the binder. Using a dispersing emulsifier to stir and disperse the above electrolyte slurry evenly to obtain a uniform electrolyte slurry. The degassed electrolyte slurry is uniformly coated on a PET (polyethylene terephthalate) film by using an AFA-II automatic film coating machine to obtain a uniform and soft electrolyte film. The electrolyte film was removed from the PET film, and the film was cut into electrolyte sheets with a diameter of 25 mm. By pressing and firing, the cut electrolyte film was placed in an Ar gas-protected debinding box, and sintered at 1000°C for 6 hours to discharge the binder in the electrolyte film and obtain a dense garnet-type Li 7 La 3 Zr 2 o 12 (LLZO) electrolyte sheet.

[0045] Use carbon as a blocking electrode to test its conductivi...

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Abstract

The invention relates to a preparation method for a garnet type solid electrolyte material. The preparation method comprises the following steps: mixing garnet type electrolyte powder, a binder and solvent so as to obtain electrolyte slurry; coating a PET film with the obtained electrolyte slurry and carrying out drying at a set drying temperature to partially evaporate the solvent so as to obtain an electrolyte film; peeling the electrolyte film from the PET film and cutting the electrolyte film according to a certain specification; and discharging the binder and the residual solvent in the cut electrolyte film so as to obtain a compact garnet type lithium-ion conductor electrolyte sheet. The preparation method provided by the invention can effectively overcome the problem that an electrolyte sheet prepared by using a conventional all-solid electrolyte sheet preparation method has large thickness and poses influence to the electrical performance of an all-solid-state battery.

Description

technical field [0001] The invention relates to the technical field of solid electrolyte materials, in particular to a preparation method of garnet-type solid electrolyte materials. Background technique [0002] Because lithium secondary batteries have many advantages such as large output power, high energy density, long service life, high average output voltage, small self-discharge, no memory effect, fast charge and discharge, excellent cycle performance and no environmental pollution, it has become It is the first choice of rechargeable power source for portable electronic products today, and it is also considered to be the most competitive vehicle power battery. Therefore, at present, lithium secondary batteries have entered thousands of households and become an inseparable part of society. In general, lithium secondary batteries mainly include liquid lithium secondary batteries and solid lithium secondary batteries. Among solid-state lithium secondary batteries, batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525C04B35/48C04B35/622C04B35/638
CPCC04B35/48C04B35/62218C04B35/638C04B2235/3203C04B2235/3227C04B2235/96H01M10/0525H01M10/0562Y02E60/10
Inventor 朱骏许晓雄赵锋东杨菁张秩华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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