Composite solid-state electrolyte, preparation method thereof and lithium secondary solid-state battery containing composite solid-state electrolyte

A solid electrolyte, lithium secondary battery technology, applied in non-aqueous electrolyte batteries, secondary batteries, solid electrolytes, etc., can solve the problems of strict requirements, unsuitable for large-scale popularization, poor cycle stability, etc.

Pending Publication Date: 2020-03-27
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation operation of this kind of electrode material is complicated and the requirements are strict, so it is not suitable for large-scale popularization.
[0006] The second method is to add a liquid component such as a conventional electrolyte (1M LiPF6/ethyle

Method used

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  • Composite solid-state electrolyte, preparation method thereof and lithium secondary solid-state battery containing composite solid-state electrolyte
  • Composite solid-state electrolyte, preparation method thereof and lithium secondary solid-state battery containing composite solid-state electrolyte

Examples

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Effect test

Embodiment 1

[0034] A composite solid-state electrolyte consisting of polyvinylidene fluoride (PVDF), lithium bis(trifluoromethylsulfonate)imide (LiTFSI), Li 7 La 3 Zr 2 o 12 (LLZO) and N-methyl-N-propylpiperidine bis(trifluoromethylsulfonyl)imide (PP13TFSI).

[0035] The preparation method is as follows: firstly, PVDF, LiTFSI, LLZO and PP13TFSI are dissolved in DMF solvent at a mass ratio of 20:45:5:30, stirred for 3 hours, and fully mixed to form a slurry. Finally, the slurry was cast in a tetrafluoroethylene mold and dried in vacuum at 55°C for 24 hours to obtain a composite solid electrolyte with a certain thickness. The thickness can be controlled at 150 microns by the solid content and the amount of pouring slurry.

[0036] Solid-state batteries use lithium iron phosphate (LiFePO 4 ) is the positive electrode and graphite is the negative electrode. The positive and negative electrodes are made by traditional methods, but metal current collectors such as aluminum foil and copper f...

Embodiment 2

[0041] Except that the mass ratio of PVDF, LiTFSI, LLZO and PP13TFSI was 25:40:5:30, a solid-state battery was prepared and tested in the same manner as in Example 1.

Embodiment 3

[0043] In addition to using polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) instead of polyvinylidene fluoride, and making the mass ratio of PVDF-HFP: LITFSI: LLZO: PP13TFSI 35:20:5:40, in accordance with the implementation A solid-state battery was prepared and tested in the same manner as Example 1.

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Abstract

The invention provides a composite solid-state electrolyte, a preparation method thereof and a lithium secondary solid-state battery comprising the composite solid-state electrolyte. The composite solid electrolyte comprises a polymer matrix, an inorganic solid electrolyte filler, a lithium salt and an ionic liquid, wherein based on the total mass of the composite solid electrolyte, the mass content of the polymer matrix is 10%-40%; wherein the mass content of the lithium salt is 15%-60%; the mass content of the inorganic solid electrolyte filler is 2%-10%; wherein the mass content of the ionic liquid is 20-50%, the thickness of the composite solid electrolyte is 80-200 [mu] m, and the thickness of the assembled battery is pressed to 20-50 [mu] m under the pressure of 20-50 MPa. Both the positive electrode and the negative electrode of the lithium secondary solid-state battery do not contain a current collector.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a composite solid electrolyte, a preparation method thereof, and a lithium secondary solid-state battery comprising the electrolyte. When the solid electrolyte is inserted between a positive electrode that does not contain a current collector and a negative electrode that does not contain a current collector, and the laminated body of the positive electrode / solid electrolyte / negative electrode is pressurized, the pressure can reduce the recombination between the positive electrode and the negative electrode. The thickness of the solid electrolyte layer, so that it can be assembled into a high-energy-density solid-state battery with no current collector electrodes; in the process of applying pressure, the solid electrolyte can seep out of the liquid electrolyte, wet the interface, and improve the interface between the electrode and the solid electrolyte , red...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/052H01M4/04
CPCH01M10/0565H01M10/052H01M4/043H01M2300/0065Y02E60/10
Inventor 项宏发周鑫高典孙毅梁鑫
Owner HEFEI UNIV OF TECH
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