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Multi-component solid electrolyte and preparation method and application thereof

A solid electrolyte, multi-component technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems that the blends cannot achieve molecular mutual compatibility, and it is difficult to mix uniformly to prepare solid electrolytes, and achieve good uniformity. , the effect of high mechanical strength and high ionic conductivity

Pending Publication Date: 2020-04-10
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the compatibility of polymers, most blends cannot achieve mutual compatibility at the molecular level or segment level, making it difficult to mix uniformly to prepare solid electrolytes.

Method used

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  • Multi-component solid electrolyte and preparation method and application thereof
  • Multi-component solid electrolyte and preparation method and application thereof
  • Multi-component solid electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A kind of multi-component solid electrolyte, its specific preparation method is as follows (see figure 1 ):

[0050] Polyethylene oxide (PEO) has high ionic conductivity at 60°C, but its low mechanical strength, poor heat resistance, and narrow electrochemical window limit its further application. Polyvinylidene fluoride-hexafluoropropylene [P(VDF-HFP)] has good mechanical strength and high temperature resistance, and has an electrochemical window exceeding 4.5V. It is highly feasible to use P(VDF-HFP) to modify PEO, which can effectively improve the mechanical strength, heat resistance and electrochemical window of PEO.

[0051] (1) The required raw materials polyethylene oxide (PEO), polyvinylidene fluoride-hexafluoropropylene [P(VDF-HFP)], lithium bistrifluoromethanesulfonylimide (LiTFSI), lithium lanthanum zirconium oxide (LLZTO) ceramic powder was placed in a vacuum oven and dried under vacuum at 50°C for 12h.

[0052] (2) Weigh 0.6g of PEO with a weight average...

Embodiment 2

[0070] A multi-component solid electrolyte, its specific preparation method is as follows:

[0071] (1) Weigh 0.5g polyacrylonitrile, 0.5g polyethylene oxide, 0.6g LiFSI and 0.3g polyamide fiber.

[0072] (2) Weigh 8 mL of acetonitrile and 8 mL of dimethylformamide, and stir magnetically for 5 minutes.

[0073] (3) Add (1) Chinese medicine into (2) solution, heat at 60° C., stir for 6 hours, and the solution becomes a homogeneous solution.

[0074] (4) Pour the above homogeneous solution into a polytetrafluoroethylene mold, and control the thickness of the solid electrolyte by controlling the amount and solid content of the solution.

[0075] (5) After standing still for 6 hours, the surface solution was volatilized and dried, heated in a vacuum oven at 60° C., and dynamically evacuated for 12 hours to obtain a solid electrolyte.

[0076] Figure 14 The scanning electron microscope image of the solid electrolyte prepared for this example shows that the blended solid electro...

Embodiment 3

[0079] A multi-component solid electrolyte, its specific preparation method is as follows:

[0080] (1) Weigh 0.3g of polyacrylonitrile (PAN), 0.7g of polyvinylidene fluoride (PVDF), 0.5g of sodium bistrifluorosulfonate and 0.2g of glass fiber.

[0081] (2) Considering that PAN is dissolved in acetone and PVDF is dissolved in tetrahydrofuran, a mixed solvent system of acetone and tetrahydrofuran is used in this example to prepare a blended solid electrolyte membrane. Weigh 4.8mL acetone and 11.2mL tetrahydrofuran, and magnetically stir 5 minutes.

[0082] (3) Add (1) Chinese medicine into (2) solution, heat at 60°C, and stir for 6 hours.

[0083] (4) Pour the above homogeneous solution into a polytetrafluoroethylene mold.

[0084] (5) After standing still for 6 hours, put it into a vacuum oven, heat at 60° C., and apply a dynamic vacuum for 12 hours to obtain a solid electrolyte that can be applied to a sodium-ion secondary battery.

[0085] Figure 16 From the scanning el...

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Abstract

The invention relates to a multi-component solid electrolyte and a preparation method and application thereof. The preparation method of the solid electrolyte comprises the following steps: 1) selecting at least two polymers and solvents matched with the polymers; 2) adding the polymers and an alkali metal salt into the solvent in the step 1), and performing uniformly mixing to obtain a mixed solution; and 3) drying the mixed solution in the step 2) to obtain a multi-component solid electrolyte. The multi-component solid electrolyte is used in a lithium ion battery or a sodium ion battery. Compared with the prior art, according to the invention, blending of two or more than two polymers which are incompatible originally can be realized, and uniform blending of any polymer can be realized by using the method disclosed by the invention, so that the function of the mixed polymer is designed through component design, and the prepared solid electrolyte simultaneously meets the requirementsof high ionic conductivity, high ionic migration number, high mechanical strength and high high-temperature resistance.

Description

technical field [0001] The invention belongs to the technical field of alkali metal ion batteries, and relates to a multi-component solid electrolyte, its preparation method and its application in lithium ion batteries and sodium ion batteries. Background technique [0002] Since its commercialization in 1991, lithium-ion batteries have been widely used in electronic products, large-scale energy storage equipment and power batteries, and have penetrated into all aspects of national production and life. With the improvement of people's living standards, higher demands are placed on the energy density and safety of batteries. The current commercial lithium-ion battery system cannot meet the needs of social development, and the organic electrolyte system used cannot avoid safety hazards such as battery short circuit, combustion, and explosion caused by lithium dendrite growth. At the same time, sodium-ion batteries have attracted extensive attention due to the abundant reserve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 罗巍黄云辉王腾锐胡晨晨朱冠楠冯奇
Owner TONGJI UNIV
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