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3D network organic-inorganic hybrid all-solid-state electrolyte and lithium secondary battery

An electrolyte, all-solid-state technology, used in non-aqueous electrolyte batteries, secondary batteries, solid electrolytes, etc., can solve the problems of poor high-temperature mechanical properties and thermal stability, large thickness of electrolyte sheets, and high battery interface resistance, and achieve inhibition of lithium branching. effect of crystal growth, good flexibility and adhesion

Pending Publication Date: 2018-08-03
GUANGDONG DYNAVOLT NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PEO-based solid polymer electrolyte membrane disclosed by CN106876784A has problems such as low room temperature ionic conductivity, poor high-temperature mechanical properties and thermal stability, and is prone to short circuit, which is difficult to meet the actual use requirements
The pomegranate-type LLZO solid oxide electrolyte disclosed in CN106941190A has high conductivity at room temperature, but the thickness of the electrolyte sheet is large and brittle, resulting in high interfacial resistance of the battery, which greatly reduces the gravimetric energy density and volume energy density of the battery, making it difficult to prepare large-capacity batteries. core
Therefore, the key issue of the current solid-state electrolyte is to prepare an organic-inorganic hybrid solid-state electrolyte membrane with high lithium ion conductivity, high oxidation resistance potential, both mechanical properties and ion conductivity characteristics, and can completely inhibit the penetration of lithium dendrites throughout the life cycle. Realize the fusion of high mechanical strength and high ionic conductivity, and solve the problem that it is difficult to balance ionic conductivity and mechanical properties in current electrolytes

Method used

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  • 3D network organic-inorganic hybrid all-solid-state electrolyte and lithium secondary battery

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preparation example Construction

[0060] The present invention also provides a preparation method of the above-mentioned 3D network organic-inorganic hybrid all-solid-state electrolyte, comprising the following steps:

[0061] A) mixing linear polymer, lithium salt and solvent to obtain mixed solution;

[0062] B) mixing the reaction monomer with epoxy group, glycidyl ether type epoxy resin and its derivatives, crosslinking agent, oxide electrolyte nanoparticles and solvent to obtain a mixed dispersion;

[0063] C) mixing and stirring the mixed solution and the mixed dispersion to obtain a reaction precursor solution;

[0064] D) injecting the reaction precursor solution into the mold or coating the surface of the substrate, heating to react, and drying to obtain a 3D network organic-inorganic hybrid all-solid-state electrolyte;

[0065] Step A) and step B) are not limited in order.

[0066] Specifically, in the present invention, the solvent described in step A) and the solvent described in step B) are pref...

Embodiment 1

[0083] The present embodiment relates to a method for preparing a 3D network organic-inorganic hybrid solid-state electrolyte, and the method includes the following steps:

[0084] (1) Add 0.10g of polyethylene oxide (PEO, Mn=600000) to a 25ml beaker A, then add 2.0g of acetonitrile dropwise with a pipette, stir for 2h to dissolve it completely, then add 0.55g of LiTFSI and continue stirring Form a colorless and transparent solution;

[0085] (2) 0.10g polyethylene glycol diglycidyl ether (Mn=500), 0.06g bisphenol A diglycidyl ether epoxy resin E51 (epoxy value 186) and 0.4 g polyetheramine (Mn=2000) was added to the beaker, 2.0g of acetonitrile was added dropwise with a pipette, and finally 1.2g of LAGP nanoparticles (particle size: 300±10nm) were added, stirred for 6h and mixed well to form a white precursor mixture.

[0086] (3) Pour the solution in beaker A into beaker B, and after rapid stirring for 6 hours, a uniformly mixed reaction precursor mixture is obtained; the ...

Embodiment 2

[0098] The present embodiment relates to a preparation method of a PEO+lithium salt-based all-solid-state electrolyte reference sample, and the method includes the following steps:

[0099] (1) Add 0.72g of PEO (Mn=100000) into a 25ml beaker, then dropwise add 6.0g of acetonitrile, stir to dissolve completely, then weigh 0.59g of LiTFSI, stir for 6h and mix well. The above solution was poured into a clean polytetrafluoroethylene mold, and after standing for a period of time, it was placed in a vacuum oven for drying at a constant temperature of 60 ° C for 8 hours to obtain PEO+lithium salt-based all-solid-state electrolyte. The obtained PEO-based solid electrolyte membrane was Put it in the glove box for later use.

[0100] The thickness of the PEO+lithium salt-based all-solid-state electrolyte membrane prepared in this example is 180 μm, and the room temperature conductivity is 1.52×10 -5 S cm -1 .

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Abstract

The invention provides a 3D network organic-inorganic hybrid all-solid-state electrolyte. The 3D network organic-inorganic hybrid all-solid-state electrolyte comprises a three-dimensional network polymer electrolyte matrix, oxide electrolyte nanoparticles or oxide electrolyte nanoparticle aggregation substance and a lithium salt, wherein the three-dimensional network polymer electrolyte matrix isused as a 3D network organic-inorganic hybrid all-solid-state electrolyte framework, the oxide electrolyte nanoparticles or the oxide electrolyte nanoparticle aggregation substance and the lithium salt are dispersed in the three-dimensional network polymer electrolyte matrix, and the three-dimensional network polymer electrolyte matrix is obtained by ring-opening polymerization of a reaction monometer with epoxy group, glycidyl ether-type epoxy resin, a derivative of the glycidyl ether-type epoxy resin, a cross-linking agent and a linear polymer.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and in particular relates to a 3D network organic-inorganic hybrid all-solid-state electrolyte and a lithium secondary battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy density, high operating voltage, low self-discharge rate, fast charge and discharge, long service life and no memory effect (J. Power Sources., 2011, 196: 8651–8655), which makes lithium Batteries are considered to be the best choice for large-scale power batteries. However, due to the low energy density of graphite anode, the energy density of current lithium-ion batteries is usually around 200Wh / kg, which seriously restricts the wide application of lithium-ion batteries in electric vehicles. With the acceleration of the commercialization of pure electric vehicles, it is urgent to further improve the energy density of lithium-ion batteries (energy density...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 卢青文刘丹陈乐伍
Owner GUANGDONG DYNAVOLT NEW ENERGY TECH CO LTD
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