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Die and method for preparing polymer composite solid electrolyte through electric field induced orientation

A solid electrolyte and electric field induction technology, which is applied in the direction of composite electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte battery, etc., to achieve strong selectivity, improve ionic conductivity, good elasticity and toughness

Active Publication Date: 2021-04-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a mold and method for preparing a polymer composite solid electrolyte by electric field-induced orientation, aiming at the problem of low ion conductivity of the current polymer solid electrolyte. A composite solid electrolyte material in which inorganic solid electrolyte particles are oriented under an alternating electric field, the purpose is to improve the ionic conductivity of the solid electrolyte, improve interface problems, and lay the foundation for the preparation of all-solid-state batteries

Method used

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  • Die and method for preparing polymer composite solid electrolyte through electric field induced orientation
  • Die and method for preparing polymer composite solid electrolyte through electric field induced orientation
  • Die and method for preparing polymer composite solid electrolyte through electric field induced orientation

Examples

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Effect test

Embodiment 1

[0055] In this example, the polymer PEO (molecular weight: 300,000) is used as the matrix, and the lithium salt LiClO is uniformly doped in the PEO 4 and inorganic material particles Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 , all carried out in a glove box full of an inert atmosphere, including the following steps:

[0056] a. In a glove box filled with an inert atmosphere, according to Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 , PEO and LiClO 4 The mass ratio of the salt is the ratio of 1.67:1:0.67, the PEO is dissolved with the solvent acetonitrile, and then LiClO is added 4 and Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 , and mechanically stirred and mixed to make a mixture, in which Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 The mass content of the mixture is 50%; then continue to add solvent acetonitrile to the mixture and stir for 8h, after mixing evenly, obtain a uniform mixed slurry, which is ready for degassing;

[0057] b. Pour the mixed slurry obtained in the step a into the circular tank,...

Embodiment 2

[0061] This embodiment is basically the same as Embodiment 1, and the special features are:

[0062] In this example, polyacrylonitrile PAN is used as a matrix, and lithium salt LiTFSI and inorganic material particles Li are uniformly doped in PAN. 14 Zn(GeO 4 ), all carried out in a glove box full of an inert atmosphere, including the following steps:

[0063] a. In a glove box filled with an inert atmosphere, according to Li 14 Zn(GeO 4 ) and the mass ratio of PAN and LiTFSI salt is the ratio of 0.6:1:0.4, adopt solvent N-methylpyrrolidone to dissolve PAN, then add LiTFSI and Li 14 Zn(GeO 4 ), mechanically stirred and mixed to make a mixture, wherein Li 14 Zn(GeO 4 ) with a mass content of 30%; then continue to add solvent N-methylpyrrolidone to the mixed slurry and stir for 8 hours, after mixing evenly, obtain a uniform mixed slurry, which is degassed for subsequent use;

[0064] b. Pour the mixed slurry obtained in the step a into the circular tank, adjust the mixed...

Embodiment 3

[0068] This embodiment is basically the same as Embodiment 1, and the special features are:

[0069] In this example, polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) was used as a matrix, and PVDF-HFP was uniformly doped with sodium salt (NaTFS) and inorganic material particles Li 0.33 La 0.557 TiO 3 , all carried out in a glove box full of an inert atmosphere, including the following steps:

[0070] a. In a glove box filled with an inert atmosphere, according to Li 0.33 La 0.557 TiO 3 The mass ratio of PVDF-HFP and NaTFS is 1.2:1:0.8, using a mixed solvent of N,N-dimethylformamide and acetone to dissolve PVDF-HFP, and then adding NaTFS and Li 0.33 La 0.557 TiO 3 , and mechanically stirred and mixed to make a mixture, in which Li 0.33 La 0.557 TiO 3 The mass content is 40%; then continue to add the mixed solvent of N,N-dimethylformamide and acetone to the mixed slurry, stir for 8 hours, and obtain a uniform mixed slurry after mixing evenly, which is degassed f...

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Abstract

The invention relates to a die for preparing solid polymer composite electrolyte through electric field induced orientation, and belongs to the technical field of lithium or sodium ion battery solid electrolyte. The die is characterized by comprising: a lower base designed to be a conductive circular disc, wherein upper surface of the lower base is provided with a circular groove, and one side of the lower base is provided with a first electrode; a horizontal adjusting nut arranged at the bottom of the lower base and used for adjusting the levelness of the lower base; a gradienter connected with the lower base; and an insulating ring, an insulating spacer, a planar conducting electrode and an upper base. The invention also provides a method for preparing the solid polymer composite electrolyte by adopting the die. Through a high-voltage electric field of the inorganic ion conductor part, an inorganic ion conductor is polarized under the action of the high-voltage electric field, so that torque is generated to enable the inorganic ion conductor to be oriented along the direction of the electric field; and the electrode has obvious advantages in formation of a rapid Li<+> or Na<+> transmission path, can significantly improve the ionic conductivity of the electrolyte, and can reach 104 S.cm<-1> magnitude at 60 DEG C.

Description

technical field [0001] The invention relates to the technical field of solid-state electrolytes for lithium or sodium-ion batteries, in particular to a mold and method for preparing polymer composite solid-state electrolytes by electric field-induced orientation. Background technique [0002] In order to obtain lithium-ion batteries with high energy density, safety and long cycle life, all-solid-state ion batteries have attracted increasing attention. Polymer solid electrolytes have many advantages such as high safety, mechanical flexibility, viscoelasticity, easy film formation, adjustable shape, light specific gravity, and low cost. They are considered to be one of the most potential electrolytes for next-generation high-energy storage devices. However, polymer solid electrolytes have low ionic conductivity, only 10 at room temperature. -8 ~10 -6 S cm -1 , it is difficult to realize the application of lithium-ion batteries at room temperature. Inorganic solid electroly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0562H01M10/0565
CPCH01M10/058H01M10/0562H01M10/0565H01M2300/0088Y02E60/10Y02P70/50
Inventor 陈日明郭炳焜吕迎春周晶晶刘杨
Owner SHANGHAI UNIV
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