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Solid electrolyte membrane and preparation method thereof

A solid electrolyte membrane and solid electrolyte layer technology, applied in solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte and other directions, can solve the problems of high electrode contact interface resistance, brittle and hard mechanical properties, poor processing, and other problems, and achieve high electrical conductivity. efficiency, good flexibility, and low interfacial resistance

Inactive Publication Date: 2017-12-19
上海纳晓能源科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a solid electrolyte membrane and a preparation method thereof, to overcome the brittleness and poor mechanical properties of the inorganic solid electrolyte membrane in the prior art, lack of elasticity and difficult processing, large contact interface impedance with electrodes, lithium ions in the presence of Electrode internal transmission and other issues

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  • Solid electrolyte membrane and preparation method thereof

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preparation example Construction

[0034] The embodiment of the present application also discloses a method for preparing a solid electrolyte membrane, including steps:

[0035] (1), using a phase separation method to prepare a polymer matrix with a continuous three-dimensional network structure with a thickness of 1-100 microns, a diameter of 0.02-5 microns, and a porosity of 60-90%;

[0036] (2) The polymer matrix is ​​soaked in a slurry containing solid electrolyte powder, pulled out and dried to obtain a solid electrolyte layer with a thickness of 2-100 microns and a porosity of 0.1-15%;

[0037] (3) The surface of the solid electrolyte layer is coated with a composite layer to obtain a solid electrolyte membrane.

[0038] In the step (1), the phase separation method includes a thermally induced phase separation method and a solvent induced phase separation method.

[0039] In the step (3), a composite layer is coated on the surface of the solid electrolyte layer by means of transfer coating.

[0040] The...

Embodiment 7

[0049] (1) Preparation of polyvinylidene fluoride-hexafluoropropylene microporous membrane by phase separation method: the molecular weight is 4×10 5 The polymer polyvinylidene fluoride-hexafluoropropylene was dissolved in N,N-dimethylformamide (DMF) at room temperature to obtain a solution with a polyethylene concentration of 10 wt%, and cast into a 200 μm film, and the film Immediately immerse in a water bath at 20°C to cool, dry at 80°C to remove the solvent, and biaxially stretch at 160°C with a stretching ratio of 10*5 to obtain a polymer with a thickness of 5 microns, a wire diameter of 0.02 to 5 microns, and a porosity of 90%. Fluoroethylene-hexafluoropropylene microporous membrane.

[0050] (2), soak the polymer microporous membrane with high porosity in the Li with a size of 1 μm 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) The slurry of solid electrolyte powder was pulled out and dried to obtain a solid electrolyte layer with a thickness of 15 microns and a porosity of 20...

Embodiment 8

[0053] (1) Preparation of polyacrylonitrile microporous membrane by phase separation method: the molecular weight is 3x10 5 The polymer polyacrylonitrile is dissolved in N,N-dimethylformamide (DMF) at room temperature to obtain a solution with a concentration of polyacrylonitrile of 10 wt%, immediately immersed in a 20°C water bath to cool, and dried at 80°C to remove Solvent, biaxial stretching at 180°C, the stretching ratio is 10*8, and a polyacrylonitrile microporous membrane with a thickness of 8 microns, a wire diameter of 0.02-5 microns and a porosity of 90% is obtained.

[0054] (2), soak the polymer microporous membrane with high porosity in the Li with a size of 1 μm 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) The slurry of solid electrolyte powder was pulled out and dried to obtain a solid electrolyte layer with a thickness of 15 microns and a porosity of 20%.

[0055] (3), by the method for transfer coating, composite layer is coated on the single side of solid electrol...

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Abstract

The invention discloses a solid electrolyte membrane and a preparation method thereof. The solid electrolyte membrane comprises a solid electrolyte layer and a compound layer compounded on at least one surface of the solid electrolyte layer; a high-molecular polymer with certain lithium ion conduction capability is selected by the compound layer; and the preparation method comprises the steps of preparing a polymer matrix, of which the porosity reaches 60-90%, of a continuous three-dimensional network structure by adopting a phase separation method; soaking the polymer matrix into slurry containing solid electrolyte powder and pulling out and drying the polymer matrix to obtain the solid electrolyte layer; and coating the surface of the solid electrolyte layer with the compound layer to obtain the solid electrolyte membrane. According to the solid electrolyte membrane, inorganic solid electrolyte particles are embedded into a polymer membrane of the three-dimensional network structure to obtain the solid electrolyte layer with high ionic conductivity and good processability and mechanical property; and meanwhile, the polymer with certain lithium ion conduction capability coats a single side or double sides of the surface of the solid electrolyte layer to reduce the interface impedance.

Description

technical field [0001] The application belongs to the technical field of lithium ion batteries, and in particular relates to a solid electrolyte membrane and a preparation method thereof. Background technique [0002] At present, flammable liquid organic electrolytes are used in commercial lithium-ion batteries, which will release flammable gases during charging and discharging, leaking night, corroding electrodes, and even causing safety accidents such as fire and combustion. Inorganic solid electrolyte, with high ionic conductivity, room temperature can reach 10 -3 Scm -1 , has high thermal stability and electrochemical stability at the same time, can work in special environments such as high temperature, can effectively suppress problems such as leakage and corrosion of electrodes, and greatly improve the safety performance of lithium-ion batteries. However, the existence of inorganic solid electrolytes It is brittle and hard, has no elasticity and is not easy to proces...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 吴晓东
Owner 上海纳晓能源科技有限公司
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