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A kind of solid electrolyte and its preparation method and application

A solid electrolyte and ceramic electrolyte technology, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of easy breakage, reduced mechanical properties, lithium ion diffusion rate, low mechanical strength, etc., and achieves uniform dispersion and excellent interface. Compatibility, optimizing the effect of components

Active Publication Date: 2021-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the polymer components and ceramic electrolyte components are only mixed by physical blending, the polymer and ceramics will partially agglomerate after long-term use, reducing the mechanical properties and lithium ion diffusion rate; in addition, due to the addition of ions in the raw materials Liquid, the prepared electrolyte is not an all-solid electrolyte, so the mechanical strength is low and easy to break

Method used

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  • A kind of solid electrolyte and its preparation method and application
  • A kind of solid electrolyte and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Dissolve vinylidene fluoride in N-methylpyrrolidone to obtain a solution with a concentration of 16g / L, and stir for 1 hour, then place it in an oven with a temperature of 135°C for 48 hours, then rinse with solvent, wash and dry Obtain modified vinylidene fluoride; the above-mentioned modified vinylidene fluoride, Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Ceramic electrolyte (particle size: 50-100nm) and lithium bistrifluoromethanesulfonylimide are added to the liquid ethoxylated trimethylolpropane triacrylate monomer, and then the initiator azobisisobutyronitrile ( The addition amount is 1wt% of ethoxylated trimethylolpropane triacrylate monomer), wherein, the addition amount of modified vinylidene fluoride, ceramic electrolyte and bistrifluoromethanesulfonylimide lithium is respectively ethoxylated Add 25%, 10% and 25% of the weight of trimethylolpropane triacrylate monomer, and pour it into a polytetrafluoroethylene mold after fully stirring; finally, place the above mold ...

Embodiment 2

[0053] The preparation of the solid electrolyte is similar to that in Example 1, except that the acrylate monomer used is methyl methacrylate. After testing, the solid electrolyte prepared in this embodiment has poor mechanical properties, low thermal stability, and low lithium ion conductivity.

[0054] The solid-state electrolyte assembled battery prepared by this embodiment, wherein the positive electrode is LiFePO 4 , the negative electrode is lithium metal, tested at 0.05C, 60℃ current, LiFePO 4 The capacity of the positive electrode material is 104mAh / g.

Embodiment 3

[0056] Dissolve polyvinylidene fluoride-hexafluoropropylene in N-methylpyrrolidone to obtain a solution with a concentration of 16g / L, and stir it for 1 hour, then place it in an oven with a temperature of 135°C for 48 hours, and then vacuum hair, washing and drying to obtain modified polyvinylidene fluoride-hexafluoropropylene; the above modified polyvinylidene fluoride-hexafluoropropylene, Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Add ceramic electrolyte (particle size 50-100nm), lithium hexafluorophosphate into liquid tetraethylene glycol dimethacrylate monomer, and then add initiator azobisisobutyronitrile (addition amount is tetraethylene glycol dimethacrylate 1wt% of ester monomer), wherein, the addition of modified polyvinylidene fluoride-hexafluoropropylene, ceramic electrolyte and lithium hexafluorophosphate is respectively 10%, 5% and 10% of the weight of tetraethylene glycol dimethacrylate monomer %, after being fully stirred, poured into a polytetrafluoroethylene mold; fi...

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Abstract

The invention discloses a solid electrolyte and its preparation method and application. The solid electrolyte includes a polymer phase, ceramic electrolyte and lithium salt dispersed in the polymer phase; the polymer phase is a fluorine-containing polymer-polyacrylate copolymer. The preparation method includes: 1) mixing the fluorine-containing polymer with an organic solvent, and reacting at 100-150° C. to obtain a modified fluorine-containing polymer; 2) preparing the modified fluorine-containing polymer prepared in step 1), ceramic electrolyte, Lithium salts, acrylate monomers and initiators are mixed and polymerized in an inert atmosphere to obtain a solid electrolyte. The solid electrolyte disclosed by the invention has high mechanical strength combined with toughness, high lithium ion conductivity, excellent interfacial compatibility with metal lithium negative electrode and oxide positive electrode respectively, and high chemical / electrochemical stability , can be applied in lithium metal batteries, lithium-air batteries and lithium-sulfur batteries.

Description

technical field [0001] The invention relates to the field of novel lithium battery solid electrolytes, in particular to a solid electrolyte and a preparation method and application thereof. Background technique [0002] With the rapid development of the new energy vehicle industry, the requirements for the energy density of power batteries are getting higher and higher, while the energy density of traditional lithium-ion batteries is close to the bottleneck value, and the development of new lithium battery systems has become an urgent need. [0003] Substituting metal lithium for the graphite negative electrode of a lithium-ion battery can significantly increase the energy density of the battery and reduce the volume of the battery. However, lithium metal has poor compatibility with liquid electrolytes, and lithium metal is prone to form dendrites during repeated charging and discharging, which can easily pierce the separator and cause safety problems. By replacing the liqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/052H01M12/08
CPCH01M10/052H01M10/056H01M10/058H01M12/08H01M2220/20H01M2300/0085H01M2300/0091Y02E60/10Y02P70/50
Inventor 谢健孙秋实赵新兵
Owner ZHEJIANG UNIV
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