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Preparation method and application of high-strength solid-state composite electrolyte film

A composite electrolyte and solid electrolyte technology, applied in the field of lithium secondary battery electrolyte, can solve the problems of low ionic conductivity, poor ionic conductivity, restricting the development and application of composite solid electrolyte system, achieve high ionic conductivity, ease interface The effect of resistance, excellent non-flammable performance

Pending Publication Date: 2021-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of using polyvinylidene fluoride as the spinning polymer matrix are particularly obvious, that is, the PVDF-based solid electrolyte has only a very low ionic conductivity, and the ceramic nanoparticles coated by spinning are only arranged along the filament direction, and at the same time The incorporation of lithium salt was also neglected in the preparation process, resulting in poor ion conductivity of the spun polymer matrix, which in turn restricted the further development and application of the composite solid electrolyte system.

Method used

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  • Preparation method and application of high-strength solid-state composite electrolyte film
  • Preparation method and application of high-strength solid-state composite electrolyte film
  • Preparation method and application of high-strength solid-state composite electrolyte film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A polyacrylonitrile-coated Li 7 La 3 Zr 2 o 12 The preparation method of the fibrous membrane support material of nano particle, lithium salt, comprises the following steps:

[0045] 1) Prepare the spinning solution, weigh about 0.1gLi with an electronic analytical balance 7 La 3 Zr 2 o 12 Nanoparticles, dissolved in 8.8g of dimethylformamide, magnetically stirred for 2h, ultrasonically dispersed for 1h, then weighed 0.5g of lithium bistrifluoromethanesulfonimide and 1.2g of polyacrylonitrile, dissolved in it, magnetically stirred for 12h to Dissolve completely, let it stand for defoaming, and obtain a polyacrylonitrile solution with a concentration of about 11%, and the whole process is carried out in a glove box;

[0046] 2) Use an electrospinning device for spinning, transfer the spinning solution to the spinneret through an automatic injection device, connect the spinneret and the receiving device to the positive and negative electrodes of the high-voltage el...

Embodiment 2

[0051] A method for preparing a wettable solid composite electrolyte material, comprising the following steps:

[0052] 1) Under the protection of argon gas with a purity of ≥99%, weigh 0.5 g of lithium bistrifluoromethanesulfonimide with an electronic analytical balance and dissolve it in 1 g of acetonitrile solution, stir magnetically for 0.5 h, and then weigh 0.46 g of polyoxygen After ethylene was mixed, it was stirred for 2h to obtain a transparent mixed solution.

[0053] 2) The mixed solution obtained in step (1) is drop-coated on the polyacrylonitrile-coated Li prepared in Example 1. 7 La 3 Zr 2 o 12 In the high-strength fiber porous membrane of nanoparticles and lithium salt, the mixed solution penetrates evenly to both sides of the fiber membrane to form a thin liquid film;

[0054] 3) In a vacuum oven, dry the composite at 60° C. for 24 hours to remove the organic solvent, and obtain a solid composite electrolyte material with a wettable electrolyte film.

[00...

Embodiment 3

[0061] LiFePO prepared with solid composite electrolyte 4 / / The preparation and testing method of Li solid-state lithium battery, comprises the following steps:

[0062] 1) LiFePO 4 :Acetylene black:PVDF=80:10:10 ratio evenly coated on the aluminum foil, and dried in a constant temperature drying oven at 80°C for 8 hours, then cut the dried electrode sheet into Wafer;

[0063] 2) Cut the prepared solid composite electrolyte into Discs were placed in a glove box in an Ar atmosphere for use;

[0064] 3) The prepared LiFePO 4 Positive electrode materials, solid composite electrolyte film materials according to positive electrode shell, LiFePO 4The positive electrode material, solid composite electrolyte film, metal lithium sheet, gasket, shrapnel, and negative electrode case are assembled into a battery in sequence. The battery model is button battery 2032, and the whole process is carried out in a glove box;

[0065] 4) Electrochemical performance test of all-solid-sta...

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Abstract

The invention discloses a preparation method and an application of a high-strength solid-state composite electrolyte film, and belongs to the technical field of a lithium secondary battery electrolyte. The solid-state composite electrolyte is composed of a high-strength fiber porous membrane, an oxide solid-state electrolyte limited in a fiber structure, a lithium salt and an infiltrated polymer electrolyte. According to the method, a high-strength ceramic composite fiber porous membrane is prepared by adopting an electrostatic spinning process, and the composite electrolyte is prepared by taking the porous membrane as a supporting structure and adopting a polymer-lithium salt liquid infiltration process. The prepared composite electrolyte shows excellent mechanical strength, high ionic conductivity, a wide electrochemical stability window and good thermal stability. The method is low in cost and simple in process, the prepared film is compact and uniform, and commercialized production is facilitated. The invention also discloses the application of the solid-state composite electrolyte film in the aspect of all-solid-state lithium batteries, the solid-state composite electrolyte film has excellent safety and a reversible capacity, and a new way is opened up for a practical application of the all-solid-state lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary battery electrolytes, and in particular relates to a preparation method and application of a high-strength solid composite electrolyte film. Background technique [0002] Due to the advantages of high energy density, long cycle life, no memory effect, and no pollution, lithium secondary batteries have broad application prospects in portable consumer electronics, electric vehicles, and energy storage. At present, the market demand for lithium-ion batteries is increasing day by day, and higher requirements are placed on the energy density and safety of lithium secondary batteries. However, high energy density needs to be matched with a higher voltage positive electrode, a high capacity negative electrode, and a high-voltage electrolyte, while ensuring the safety of the battery, and the organic electrolyte itself is flammable, explosive, and has a narrow electrochemical window. The disadva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052D01F6/54D01F6/48D01F6/44D01F1/10
CPCH01M10/056H01M10/052D01F6/54D01F6/48D01F6/44D01F1/10H01M2300/0065Y02E60/10
Inventor 陈坚于跟喜李凯孙硕汪亚萍陈达明
Owner SOUTHEAST UNIV
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