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Solid electrolyte as well as preparation method and application thereof

A technology of solid electrolyte and ceramic electrolyte, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc. It can solve the problems of easy damage, low mechanical strength, and reduced diffusion rate of lithium ions in mechanical properties, so as to achieve uniform dispersion and improve electrical conductivity. The effect of improving the interface compatibility

Active Publication Date: 2019-07-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Solid electrolyte as well as preparation method and application thereof
  • Solid electrolyte as well as preparation method and application thereof
  • Solid electrolyte as well as preparation method and application thereof

Examples

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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 as well as a preparation method and application thereof. The solid electrolyte comprises a polymer phase, and a ceramic electrolyte and a lithium salt whichare dispersed in the polymer phase. The polymer phase is a fluoropolymer-polyacrylate copolymer. The preparation method comprises the following steps: 1) mixing fluoropolymer with an organic solvent,and reacting at 100-150 DEG C to obtain a modified fluoropolymer; and 2) mixing the modified fluoropolymer prepared in the step 1), the ceramic electrolyte, the lithium salt, an acrylate monomer andan initiator, and carrying out a polymerization reaction in an inert atmosphere to obtain the solid electrolyte. The solid electrolyte has the advantages of high mechanical strength, high toughness, high lithium ion conductivity, excellent interfacial compatibility with a metal lithium negative electrode and an oxide positive electrode and high chemical / electrochemical stability, and can be applied to a metal lithium battery, a lithium air battery and a lithium-sulfur battery.

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 Applications(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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