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Solid electrolyte film material, preparation method thereof, and battery

A technology of solid electrolyte and thin film material, applied in the energy field, can solve the problems of increasing ionic conductivity and mechanical properties, waste, solvent pollution, etc., achieve good electrochemical performance, improve ionic conductivity, and ensure the effect of mechanical properties

Active Publication Date: 2019-08-20
GUANGZHOU HUAXINKE ENTERPRISE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solution casting molding can obtain a material in which lithium salt and matrix are fully dispersed through solvent volatilization, but the use of a large amount of solvent in the process will easily cause solvent pollution and waste, and the presence of plasticizer will sacrifice the mechanical properties of the material; hot pressing of polymer and filler Although molding avoids the influence of solvents and plasticizers, it is difficult to guarantee the dispersibility of ball milling, and its electrochemical and mechanical properties are not outstanding, so it does not have the value of in-depth exploration; functional cross-linking and copolymerization can increase ion conductivity It is an effective method for high efficiency and mechanical properties, but its reaction complexity has caused great obstacles to industrial production

Method used

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  • Solid electrolyte film material, preparation method thereof, and battery
  • Solid electrolyte film material, preparation method thereof, and battery
  • Solid electrolyte film material, preparation method thereof, and battery

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preparation example Construction

[0019] The preparation method of the solid electrolyte thin film material of one embodiment of the present invention comprises the following steps: mixing polyethylene oxide, complex lithium salt, structural support polymer, silane coupling agent, antioxidant, thermal stabilizer and dispersant, Then extruding and calendering to form a film through a stretching rheological extrusion process to obtain a solid electrolyte film material. Wherein, the structural supporting polymer is one or more of polyethylene, vinylidene fluoride-hexafluoropropylene copolymer, polyvinyl chloride, and ethylene-(meth)acrylate polymer.

[0020] The solid electrolyte film material of the present invention is formulated to be optimized, and on the basis of polyethylene oxide, a structural supporting polymer is selectively added to make up for the mechanical properties of the PEO-lithium salt system. And through the stretching rheological extruder to process under the stretching flow field, the volume ...

Embodiment 1

[0034] Under the protection of nitrogen, 4 g of cyclohexane-1,4-dicarbonitrile was dissolved in 100 ml of tetrahydrofuran, and the temperature was lowered to -10°C. Then 20 mL of trifluoromethanesulfonic acid was added dropwise and stirred for 1 hour, keeping the reaction temperature at -10°C. Raise the temperature to reflux temperature, reflux for 1 hour, and wash with 1M sodium hydroxide solution to remove residual acid. The white or light yellow powder was obtained by filtration, washed with water and ethanol, and dried in vacuum at 110° C. to obtain a nitrogen-rich porous organic framework polymer.

[0035] In a glove box (or other dry environment), mix 12g of lithium salt with 2g of treating agent and 4g of nitrogen-rich porous organic framework polymer, and heat and stir for 1 hour under the action of a small amount of acetonitrile (10150ml). The solvent was then removed by distillation under reduced pressure, and vacuum-dried at 120° C. for 24 hours. The dried product...

Embodiment 2

[0038] The scheme of this embodiment is basically the same as that of Embodiment 1, except that the complex lithium salt is 0.52 mol (calculated according to lithium ions, EO / Li is 11).

[0039] Example 1

[0040] The scheme of this embodiment is basically the same as that of Embodiment 1, except that the complex lithium salt is 0.45 mol (calculated according to lithium ions, EO / Li is 15).

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Abstract

The invention relates to a solid electrolyte film material, a preparation method thereof, and a battery. The preparation method comprises the following steps: mixing polyoxyethylene, a composite lithium salt, a structure-supporting polymer, a silane coupling agent, an antioxidant, a heat stabilizer and a dispersing agent, and then performing extruding and calendering to form a film through a tensile rheology extrusion process, so as to obtain the solid electrolyte film material, wherein the structure-supporting polymer is one of polyethylene, a vinylidene fluoride-hexafluoropropylene; polyvinyl chloride and an ethylene-(methyl) acrylate polymer or more. According to the solid electrolyte film material disclosed by the invention, the ionic conductivity of a system is improved, and meanwhile, the mechanical property of the system is improved, so that the polymer solid electrolyte film material with good mechanical property and electrochemical property is obtained.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a solid electrolyte film material, a preparation method thereof and a battery. Background technique [0002] In recent years, with the development of science and technology and the intensification of social modernization, the depletion of non-renewable resources such as petroleum and coal has made the energy economy face huge challenges, and the environmental pollution caused by fossil fuels has become increasingly serious. Sustainable utilization of energy and environmental protection have become important issues of contemporary life. Among all electrochemical energy storage devices, the lithium-ion battery is a green and environmentally friendly rechargeable secondary battery. Its electrolyte can be divided into liquid electrolyte, gel electrolyte, and solid electrolyte according to its shape. Due to the use of organic solvents, both liquid electrolytes and gel electrolytes ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0562H01M10/0565H01M2300/0065H01M2300/0088Y02E60/10
Inventor 王维于清江余波江柯成余吕宏钱玉英杨智韬瞿金平
Owner GUANGZHOU HUAXINKE ENTERPRISE
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