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Composite solid electrolyte and preparation method and application thereof

A solid electrolyte and polymer technology, applied in the field of electrolytes, can solve problems such as complex preparation methods, and achieve the effects of improving ionic conductivity, enhancing stability, and reducing diffusion impedance

Pending Publication Date: 2021-04-02
中科(马鞍山)新材料科创园有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the safety and energy density of solid electrolytes have absolute advantages, there are still many challenges before commercialization: one is to improve the conductivity of lithium ions in the material; the other is to reduce the interface impedance of solid electrolytes/electrodes; the third is to enhance the long-term The stability of the solid electrolyte structure during cycling; among them, improving the ionic conductivity of the solid electrolyte has become a key research direction in this field
[0004] CN111073184A discloses a gel electrolyte film for secondary batteries, its preparation and application, which belongs to the technical field of gel polymer electrolyte, and the gel electrolyte film is made of polyvinylidene fluoride-hexafluoropropylene, po

Method used

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  • Composite solid electrolyte and preparation method and application thereof
  • Composite solid electrolyte and preparation method and application thereof
  • Composite solid electrolyte and preparation method and application thereof

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preparation example Construction

[0084]The present invention provides a method of preparing the composite solid electrolyte, the preparation method comprising the steps of:

[0085](1) The mixed atom ratio is 3: 1.1: 2 titanium powder, aluminum powder, and scaly graphite powder, and the rotation speed is 300 to 500 r / min ball mill milling for 1 to 3 hours, and the tablets are performed under 0.5 to 2 GPa pressure, in nitrogen and / or Calcination of 1000 ~ 1800 ° C under argon atmosphere, cool to room temperature, ground 1 to 2 h, to obtain max phase Ti3ALC2-MXENE;

[0086](2) Phase Ti3ALC2-MXENE is dispersed in a fluorinated solution having a concentration of 20 to 60% by weight, and the etching reaction is carried out at a rate of 150 to 450 r / min, and the reaction product is obtained, and the reaction product is obtained, and the washed and 50 to 100 ° C dry 10 ~ 15h to get MXENE;

[0087](3) After dissolving the polymer and the lithium salt in an organic solvent, the MXENE and plasticizer were sequentially added to ...

Embodiment 1

[0090]This embodiment provides a composite solid electrolyte, the composite solid electrolyte by polyethylene oxide, double trifluoromethylsulfonimide, Ti3C2Tx-MXENE and a succinonitrile; wherein polyethylene oxide and double trifluoromethylsulfonimide is 16: 1, polyethylene oxide and Ti.3C2Tx-Mxne's mass ratio of 2.2: 1, the content of succinate is 10% by weight; accordingly, the content of polyoxyethylene is 59.3 wt%, and the content of double trifluoromethylsulfonimide is 3.7% by weight, Ti3C2TxThe -mxne content is 27 wt%.

[0091]The present invention provides a method of preparing the composite solid electrolyte, the preparation method comprising the steps of:

[0092](1) The mixed atomic ratio is 3: 1: 2 of titanium powder, aluminum powder, and scaly graphite powder, which is a rotational speed 400r / min ball mill mill, and a tablet under 1 GPa pressure is calcined at 1400 ° C for 3 h under argon atmosphere. Cool to room temperature, ground 1 h, get the max phase Ti3ALC2-MXENE;

[009...

Embodiment 2

[0098]This embodiment provides a composite solid electrolyte, the composite solid electrolyte by polyethylene, lithium styrene sulfonylimide, Ti3C2Tx-MXENE and 1-butyl-1-methylpyrrolidine double trifluoromethanesulfonimide salt; wherein polyethylene and a mass ratio of styrene sulfonylimide are 1: 1, polyethylene and Ti3C2Tx-MXENE is 1: 1,1-butyl-1-methylpyrrolidine double trifluoromethanesulfonamide salt content is 5.2% by weight; accordingly, the content of polyoxyethylene is 31.6% by weight, The content of double trifluoromethylsulfonimide is 31.6% by weight, Ti3C2TxThe -mxne content is 31.6 wt%.

[0099]The present invention provides a method of preparing the composite solid electrolyte, the preparation method comprising the steps of:

[0100](1) The mixed atomic ratio is 3: 1: 2 of titanium powder, aluminum powder, and scaly graphite powder, with a rotational speed 500r / min ball mill mill, a tablet under 0.5 GPa pressure, calcined at an argon atmosphere of 1000 ° C for 2h Cool to r...

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Abstract

The invention provides a composite solid electrolyte and a preparation method and application thereof, the composite solid electrolyte comprises a polymer, lithium salt, Mxene and a plasticizer, and the ionic conductivity of the solid electrolyte is further improved by selecting a specific plasticizer; the polymer, the lithium salt, the Mxene and the plasticizer are dissolved sequentially into anorganic solvent, and the mixture is poured into a cellulose acetate membrane to prepare the composite solid electrolyte, thereby enhancing the mechanical properties of the solid electrolyte; the composite solid electrolyte is applied to an all-solid-state lithium ion battery, the stability of the lithium ion battery can be enhanced, and the service life is prolonged.

Description

Technical field[0001]The present invention relates to the field of electrolyte techniques, and more particularly to a composite solid electrolyte and a preparation method thereof.Background technique[0002]Traditional lithium-ion batteries used in liquid electrolytes have serious safety problems, with specific reasons, including the above aspects, an organic solvent of an electrolyte (such as dimethyl carbonate, epoxy form plastic, etc.) is flammable In another aspect, the growth of the lithium branch crystal in the solution is inevitable, and it may pierce the safety accident such as the short circuit explosion in the membrane. In addition, the use of liquid electrolytes also limits the high-voltage positive electrode material to achieve high ratio energy. Practical.[0003]Based on the above problems, the use of solid-state electrolytes is considered to be the core development direction of the lithium battery in the future, compared to traditional liquid electrolytes, the solid elect...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0565H01M10/4235H01M2300/0085Y02E60/10
Inventor 冯海兰李培谭强强冯建林汪荣强
Owner 中科(马鞍山)新材料科创园有限公司