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Organic-inorganic composite solid electrolyte material and preparation method and application thereof

A solid electrolyte, inorganic electrolyte technology, applied in electrolytes, circuits, electrical components, etc., can solve the problems of insufficient manufacturing process and overall structure design, influence of battery electrochemical performance, lack of solid electrolyte, etc., and achieve good room temperature ionic conductivity. , the effect of improving safety and reducing production costs

Inactive Publication Date: 2019-01-18
溧阳中科海钠科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the key challenge in the development of the existing all-solid-state sodium-ion battery technology is that the solid-state electrolyte does not have high ionic conductivity at room temperature, so it has an impact on the electrochemical performance of the battery. There are also deficiencies in the exploration of the overall structural design

Method used

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  • Organic-inorganic composite solid electrolyte material and preparation method and application thereof
  • Organic-inorganic composite solid electrolyte material and preparation method and application thereof
  • Organic-inorganic composite solid electrolyte material and preparation method and application thereof

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preparation example Construction

[0026] The preparation method of the organic-inorganic composite solid electrolyte material provided by the embodiment of the present invention, its main process is as follows figure 1 shown, including the following steps:

[0027] Step 110, preparing the polymer matrix, sodium salt and inorganic electrolyte powder according to the mass ratio x:(100-x-y):y, and vacuum drying at 100°C-200°C for 4 hours-12 hours;

[0028] Among them, x≥60, y≥5, and x+y<100;

[0029] The polymer matrix includes one or more combinations of polyvinylidene fluoride (PVDF), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and polypropylene carbonate (PPC), among which PVDF The molecular weight of PVDF-HFP is 50,000-120,000; the molecular weight of PPC is 50,000-100,000.

[0030] The sodium salt is sodium perchlorate (NaClO 4 ) and / or sodium bistrifluoromethanesulfonylimide (NaTFSI).

[0031] The inorganic electrolyte powder has a NASICON structure, and the compound formula is:

[0032...

Embodiment 1

[0042]The inorganic electrolyte with a particle diameter of 5 μm was dispersed and stirred in NMP for 2 hours. Subsequently, PVDF and NaTFSI were added to the mixture and stirred evenly to form a uniform slurry. The solid content of the slurry is 15%, PVDF accounts for 10% of the total mass, NaTFSI accounts for 4% of the total mass, and the mass of the inorganic electrolyte accounts for 1%. The prepared slurry was coated on a grinding tool, heated and dried, and then vacuum-dried for 12 hours after the solvent evaporated completely to obtain a solid electrolyte material.

[0043] The real object of the solid electrolyte material prepared in Example 1 is as follows: figure 2 shown. image 3 It is the AC impedance spectrum measured at room temperature 25°C for the solid electrolyte material of the embodiment of the present invention, and the calculated conductivity is 2×10 -4 S / cm.

Embodiment 2

[0045] The inorganic electrolyte with a particle diameter of 200 nm was dispersed and stirred in NMP for 2 hours. Subsequently, PVDF, PVDF-HFP and NaTFSI were added into the mixture and stirred evenly to form a uniform slurry. The solid content of the slurry is 12%, the polymer matrix accounts for 8% of the total mass, wherein the mass ratio of PVDF to PVDF-HFP is 5:5, NaTFSI accounts for 3% of the total mass, and the mass of inorganic electrolyte accounts for 2%. The prepared slurry was coated on a grinding tool, heated and dried, and then vacuum-dried for 12 hours after the solvent evaporated completely to obtain a solid electrolyte material.

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Abstract

The embodiment of that present invention relates to an organic-inorganic composite solid electrolyte material and preparation method and application thereof. The preparation method includes preparingpolymer matrix, sodium salt and inorganic electrolyte powder according to that mass ratio x: (100-x-y): y, and vacuum drying at 100 DEG C to 200 DEG C for 4 hours to 12 hours respectively; Where x >=60, y >= 5, and x + y <100; Adding inorganic electrolyte powder into an organic solvent for dispersion, and stirring in vacuum for 2 to 4 hours to obtain a first mixture; Adding a polymer matrix intothe first mixture, stirring in vacuo for 0.5 to 2 hours to dissolve the polymer matrix in the first mixture to obtain a second mixture; Adding sodium salt into the second mixture and stirring in vacuum for 4 to 8 hours to obtain a solid electrolyte slurry; The solid electrolyte slurry is poured into a film forming mold, heated to 60 DEG C to 80 DEG C until the solvent is completely volatilized, and vacuum dried at 100 DEG C to 120 DEG C for 4 to 12 hours, thereby obtaining an organic-inorganic composite solid electrolyte material.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to an organic-inorganic composite solid state electrolyte material and its preparation method and application. Background technique [0002] With its high energy density, long cycle life, no memory effect, fast charging and discharging, and environmental friendliness, lithium-ion batteries have attracted much attention since they were put into the market. They are used in 3C products, power tools, electric bicycles and other consumer electronics dominate. In recent years, it has also shown remarkable development prospects in the fields of power batteries and energy storage batteries. [0003] However, the lithium resources on the earth are very poor. The abundance of lithium in the earth's crust is only 0.0065%, and the distribution is extremely uneven. With the advent of the future era of electric vehicles and smart grids, the high price of lithium due to lack of reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0562H01M10/054
CPCH01M10/054H01M10/0562H01M10/0565H01M2300/0091Y02E60/10
Inventor 田龙飞周权汤菲唐堃康利斌戚兴国
Owner 溧阳中科海钠科技有限责任公司
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