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Multilayer solid electrolyte, preparation method thereof and solid lithium battery

A technology of solid electrolyte and solid electrolyte membrane, applied in non-aqueous electrolyte batteries, solid electrolytes, electrolyte immobilization/gelation, etc., can solve problems such as differences in mechanical properties, difficult solid electrolyte structure, etc.

Pending Publication Date: 2021-05-28
郑州宇通集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method not only achieves the compounding of each layer of solid electrolyte by pressing, but also improves the compactness of the multi-layer solid electrolyte to a certain extent. However, due to the different solid electrolytes in each layer, the mechanical properties are different, and the pressing It is difficult for each layer of the process to form a dense solid electrolyte structure

Method used

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preparation example Construction

[0026]The preparation method of multilayer solid electrolyte provided by the present invention includes the following steps:

[0027]1) According to the composition of each layer of solid electrolyte in the multilayer solid electrolyte, a solid state electrolyte membrane layer compirating with each solid electrolyte layer is prepared;

[0028]2) The respective solid electrolyte membrane layers prepared in step 1) are compressed to obtain a densified solid electrolyte membrane layer;

[0029]3) The solidified solid electrolyte membrane layer is then pressurized, which is obtained.

[0030]In a specific embodiment of the preparation method of the multilayer solid electrolyte of the present invention, the pressurization mode of pressurization is performed in step 2), and the pressurization method of pressurizing composite is not limited in step 3). Self-roller press, flat press or the like. Further, in step 2), the pressurization method is performed in step 3), and the pressurized compression mode...

Embodiment 1

[0057]The preparation method of the multilayer solid electrolyte of the present embodiment is a double layer solid electrolyte as an example, the structure of the double solid electrolyte is a polymer solid electrolyte layer-inorganic solid electrolyte layer, the preparation method includes the following steps:

[0058]1) According to the two-layer solid electrolyte each layer, the solid electrolyte film is formed, respectively, the solid state electrolyte membrane layer composition consistent with each of the solid electrolyte layers, respectively:

[0059]According to the polymer solid-state electrolyte layer, 70 parts by weight of polyethylene oxide (PEO), 20 parts by weight of two-trifluoromethylsulfonimide (Litfsi), 10 parts by weight of Li1.5Al0.5GE1.5(Po4)3(LAGP) The polymer solid electrolyte paste is added to the acetonitrile solvent, and then the polymer solid electrolyte slurry is evenly coated onto a PET film substrate having a 36 μm thick, and 12 μm thick PEO polymer is formed...

Embodiment 2

[0066]The preparation method of the multilayer solid electrolyte of the present embodiment is as an example, the three-layer solid electrolyte structure is the first polymer solid electrolyte layer - inorganic solid electrolyte layer - the second polymer solid electrolyte layer, preparation The method includes the following steps:

[0067]1) Composition of solid state electrolyte membrane layers composed to each solid electrolyte layer according to the composition of each of the solid electrolyte layers in the multilayer solid electrolyte:

[0068]According to the composition of the first polymer solid electrolyte layer, 75 parts by weight of the vinylidene ester (PVCA), 25 parts by weight of lithium carborate (LIODFB) is added to N, N-dimethylformamide (DMF) The solvent is made into a polymer solid electrolyte slurry, and then the polymer solid electrolyte slurry is uniformly applied to the PET film substrate, and after drying, 15 μm thick PVCA polymer solid electrolyte membrane layer is...

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Abstract

The invention relates to a multilayer solid electrolyte, a preparation method thereof and a solid lithium battery, and belongs to the technical field of lithium batteries. The preparation method of the multilayer solid electrolyte comprises the following steps: 1) according to the composition of each layer of solid electrolyte in the multilayer solid electrolyte, preparing a solid electrolyte membrane layer with the same composition as each solid electrolyte layer; (2) pressurizing each solid electrolyte membrane layer prepared in the step (1) to obtain a densified solid electrolyte membrane layer; and (3) pressurizing and compounding the densified solid electrolyte membrane layers to obtain the solid electrolyte membrane. According to the preparation method of the multilayer solid electrolyte, the solid electrolyte membrane of each layer is compressed and compacted and then is compounded, so that the compactness of the solid electrolyte of each layer is improved, extension deformation of the solid electrolyte of a ductile layer caused by different pressures required in the process of compressing and compacting the solid electrolyte of each layer is avoided, and different electrolyte systems can be adapted conveniently.

Description

Technical field[0001]The present invention relates to a multilayer solid electrolyte and a preparation method thereof, a solid lithium battery, belonging to a solid lithium battery technology.Background technique[0002]With the excessive depletion of fossil fuel and environmental pollution problems, the development of new energy is increasingly attached to human society, and the battery is a core position in the new energy field as the core component of the energy storage system. Lithium-ion batteries occupy portable electronics and new energy vehicles battery markets due to high energy density, high power density, good environmental adaptability, environmentally friendly, but conventional lithium-ion batteries use liquid electrolytes, due to safety The comparison reason is limited to its further development. The solid-state lithium battery replaces the liquid electrolyte into a solid electrolyte will significantly increase the safety of the lithium battery, and the introduction of t...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/052
CPCH01M10/0562H01M10/0565H01M10/052H01M2300/0085H01M2300/0065H01M2300/0088Y02E60/10
Inventor 李云明周时国曹瑞中和冲冲裴卫兵彭能岭
Owner 郑州宇通集团有限公司
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