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Polymer solid electrolyte containing lithium-philic metal ions as well as preparation method and application thereof

A solid electrolyte, lithium metal technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of inability to meet the requirements of all-solid lithium metal batteries, low ionic conductivity, etc., and achieve the effect of good cycle stability

Active Publication Date: 2021-03-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors found that the disadvantage of the single-ion conductor polymer electrolyte is that its ionic conductivity is low, and it is difficult to realize the cycle of high specific capacity of the battery at a large rate. Electrostatic attraction, anionic groups fully anchored on the polymer backbone will limit the migration of lithium ions in the polymer matrix to a certain extent
Therefore, the current polymer solid-state electrolyte still cannot meet the requirements of all-solid-state lithium metal batteries. How to solve the defects faced by the existing polymer solid-state electrolyte has become a technical problem that researchers need to overcome.

Method used

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  • Polymer solid electrolyte containing lithium-philic metal ions as well as preparation method and application thereof
  • Polymer solid electrolyte containing lithium-philic metal ions as well as preparation method and application thereof
  • Polymer solid electrolyte containing lithium-philic metal ions as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 (radical thermal polymerization)

[0058] A Zn-containing 2+ Ionic polymer solid electrolyte:

[0059] The small molecular monomers involved include polyethylene glycol diacrylate (Poly (ethylene glycol) diacrylate, PEGDA, Mn=600g mol-1), methoxy polyethylene glycol acrylate (Poly (ethylene glycol) methylether acrylate, PEGMEA, Mn=480g mol-1), zinc dimethacrylate (Zinc methacrylate, ZnMA); radical thermal polymerization initiator is azobisisobutyronitrile (2,2'-Azobis(2-methylpropionitrile), AIBN) ; Bis(trifluoromethane)sulfonimide lithium salt (LiTFSI), acetonitrile (anhydrous acetonitrile), N-methylpyrrolidinone (1-Methyl-2-pyrrolidinone, NMP), polyvinylidene fluoride- Hexafluoropropylene (Poly(vinylidene fluoride-co-hexafluoropropylene), PVDF-HFP, Mw=400,000)).

[0060] Step (1): preparing a PVDF-HFP solution: 0.4 g of PVDF-HFP was dissolved in 2.93 g of NMP, with a mass fraction of 12%.

[0061] Step (2): Preparation of precursor solution: 1.2g PEGM...

Embodiment 2

[0075] A containing Mg 2+ Ionic polymer solid electrolyte:

[0076] Step (1): Preparation of polyvinylidene fluoride solution: 0.4 g of polyvinylidene fluoride was dissolved in 3.0 g of NMP.

[0077] Step (2): Preparation of precursor solution: Add 1.2g PEGMEA, 0.4g PEGDA, 0.1g magnesium methacrylate, 0.65g lithium salt (LiTFSI) and 5mg initiator (succinonitrile) to the previously prepared polyvinylidene fluoride Ethylene in NMP solution, and fully stirred.

[0078] Step (3): Precursor solution polymerization: Pour the stirred precursor solution on a glass plate, scrape it with a scraper to form a film, and make it polymerize under vacuum drying at 80°C for 12 hours.

[0079] Step (4): Drying the polymer electrolyte membrane: After the polymerization is completed, it is dried under vacuum drying conditions at 80°C for 10 hours to obtain a membrane containing Mg 2+ Ionic polymer solid electrolyte.

Embodiment 3

[0080] Embodiment 3 (ultraviolet polymerization)

[0081] Step (1): preparing a PVDF-HFP solution: 0.4 g of PVDF-HFP was dissolved in 2.93 g of NMP, with a mass fraction of 12%.

[0082] Step (2): preparation of precursor solution: 1.2g PEGMEA, 0.4gPEGDA, 0.1g zinc dimethacrylate, 0.65g lithium salt (LiTFSI) and 8mg photoinitiator 2-hydroxyl-2-methylpropiophenone (2- Hydroxy-2-methylpropiophenone, HMPP) was added to the NMP solution of PVDF-HFP prepared before, and fully stirred.

[0083] Step (3): Precursor solution polymerization: Pour the stirred precursor solution on a glass plate, and scrape it with a scraper to form a film, at 50mWcm -1 Polymerized under ultraviolet light with a wavelength of 365nm for 16min.

[0084] Step (4): Dry the polymer electrolyte membrane: After the polymerization is completed, it is dried under vacuum drying conditions at 80°C for 10 hours to obtain a membrane containing Zn 2+ Ionic polymer solid electrolyte.

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Abstract

The invention provides a polymer solid electrolyte containing lithium-philic metal ions as well as a preparation method and application thereof. The polymer solid electrolyte takes an acrylic acid derivative as a main structure of a polymer, carboxyl groups in lithium-philic metal acrylate are fixed on a main chain of the polymer, and the lithium-philic metal ions are dissociated in a polymer matrix. The conductivity of the polymer solid electrolyte containing lithium-philic metal ions is superior to that of a single-ion conductor electrolyte, ion regulation and control in the electrolyte canbe realized, and alloying on the surface of lithium can be realized, so that uniform deposition of lithium ions is realized, the polymer solid electrolyte has excellent stability to lithium, and a total battery prepared by the method also realizes long-time stable circulation at high multiplying power and shows good multiplying power performance.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion batteries, in particular to a polymer solid-state electrolyte containing lithium-friendly metal ions, a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The all-solid-state lithium metal battery formed by the solid-state electrolyte matching the lithium metal battery has extremely high energy density and good safety, and is an important development direction of future energy storage devices. Solid electrolytes can be broadly classified into inorganic solid electrolytes and polymer solid electrolytes. The rigid nature of inorganic so...

Claims

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Application Information

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IPC IPC(8): C08L51/08C08L27/16C08K5/43C08F290/06C08F220/06C08F220/28H01M10/0565H01M10/058H01M10/0525
CPCC08L51/08C08F290/062H01M10/0565H01M10/058H01M10/0525C08L27/16C08K5/43C08F220/06C08F220/286Y02E60/10Y02P70/50
Inventor 慈立杰曾振程俊侯广梅
Owner SHANDONG UNIV
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