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Composite electrolyte sheet, preparation method thereof and solid battery

A composite electrolyte and electrolyte sheet technology, which is applied in the field of solid-state batteries, composite electrolyte sheets and their preparation, can solve the problems of changing electrode/solid electrolyte interface contact conditions, affecting battery energy density and power density, and reducing the capacity of all-solid-state batteries. Achieve the effect of being suitable for large-scale application, improving interface contact, improving cycle performance and service life

Inactive Publication Date: 2019-11-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the contact between the solid electrolyte and the electrode material is a point-to-point contact, the contact area is much smaller than the contact between the electrolyte and the electrode material, which hinders the transport of carriers at the interface. Therefore, compared with conventional batteries, all-solid-state batteries still exist. The problem of excessive interface resistance
In addition, during the charge-discharge cycle of the battery, the volume of the electrode material will change, resulting in a change in the contact between the electrode / solid electrolyte interface, which further reduces the contact area.
The above factors will lead to a gradual decrease in the capacity of the all-solid-state battery during the charge-discharge cycle, and poor rate performance, which directly affects the energy density and power density of the battery.

Method used

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  • Composite electrolyte sheet, preparation method thereof and solid battery
  • Composite electrolyte sheet, preparation method thereof and solid battery
  • Composite electrolyte sheet, preparation method thereof and solid battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Polish the surface of NASICON solid electrolyte sheets with a thickness of 1mm, wash them in ethanol and dry them for later use. Dissolve polyvinyl alcohol in water and stir for 12 hours until uniform to obtain a polyvinyl alcohol solution with a concentration of 0.1 mol / L. The above-mentioned polyvinyl alcohol solution was evenly coated on the surface of the above-mentioned solid electrolyte sheet with a coating thickness of 0.15 mm, and dried at 80° C. for 12 hours. The above-mentioned solid electrolyte sheet coated with polyvinyl alcohol solution was placed in an argon atmosphere, and sintered at 500° C. for 2 hours to be carbonized to obtain a composite electrolyte sheet and complete the preparation of the carbon-modified layer.

[0078] The cathode material FeS 2 , NASICON solid electrolyte powder, conductive agent Super P, and binder EC are mixed according to the mass ratio of 55:20:15:10, and terpineol is added as a solvent to make positive electrode slurry. Ev...

Embodiment 2

[0081] Polish the surface of NASICON solid electrolyte sheets with a thickness of 0.5mm, wash them in ethanol and dry them for later use. Dissolve polyvinylidene fluoride in NMP and stir for 12 hours until uniform to obtain a polyvinylidene fluoride solution with a concentration of 0.2 mol / L. The above-mentioned polyvinylidene fluoride solution was evenly coated on the surface of the above-mentioned solid electrolyte sheet with a coating thickness of 0.2 mm, and dried at 80° C. for 12 hours. The above-mentioned solid electrolyte sheet coated with polyvinylidene fluoride solution was placed in an argon atmosphere, and sintered at 600° C. for 3 hours to be carbonized to obtain a composite electrolyte sheet and complete the preparation of the carbon-modified layer.

[0082] The cathode material FeS 2 , NASICON solid electrolyte powder, conductive agent acetylene black, and binder PVDF are mixed according to the mass ratio of 50:20:15:15, NMP is added as a solvent, and mixed to f...

Embodiment 3

[0085] Polish the surface of NASICON solid electrolyte sheets with a thickness of 0.8mm, wash them in ethanol and dry them for later use. Dissolve ethyl cellulose in terpineol and stir for 6 hours until uniform, to obtain an ethyl cellulose solution with a concentration of 0.05 mol / L. The above-mentioned ethyl cellulose solution was uniformly coated on the surface of the above-mentioned solid electrolyte sheet to a thickness of 0.3 mm, and dried at 80° C. for 12 hours. The above-mentioned solid electrolyte sheet coated with the ethyl cellulose solution was placed in an argon atmosphere, and sintered at 700° C. for 1 hour to be carbonized to obtain a composite solid electrolyte sheet and complete the preparation of the carbon-modified layer.

[0086] The cathode material WS 2 , NASICON solid electrolyte powder, conductive agent acetylene black, and binder CMC are mixed according to the mass ratio of 45:15:20:20, NMP is added as a solvent, and mixed to form a positive electrode...

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Abstract

The invention provides a composite electrolyte sheet, which comprises an electrolyte sheet and a carbon modification layer arranged on the surface of the electrolyte sheet. The carbon modification layer is uniformly distributed on the surface of the solid electrolyte sheet, and can be closely adhered to the surface of the solid electrolyte sheet, thereby effectively improving the interface contactin the solid battery, reducing the interface impedance and improving the cycle performance and the service life of the battery. The invention also provides a preparation method for the composite electrolyte sheet and the solid battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a composite electrolyte sheet, a preparation method thereof and a solid-state battery. Background technique [0002] In order to alleviate the current situation of environmental degradation and change the existing irrational energy structure, the development and storage of new green and clean energy has become an urgent task. New green energy represented by wind energy and solar energy has become an ideal alternative energy source. However, these green and clean energy sources are unstable and cannot be directly connected to the grid. In order to realize its utilization, it is very important to study the electrochemical energy storage technology with less geographical restrictions and mature technology. Therefore, it is of great significance to develop secondary batteries with high efficiency, safety, large capacity, long service life, and stable energy release during use. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/42
CPCH01M10/0565H01M10/4235H01M2300/0065Y02E60/10
Inventor 姚霞银杨菁刘高瞻万红利沈麟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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