In-situ preparation method and application of polymer electrolyte

An in-situ preparation and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolytes, solid electrolytes, etc., can solve problems such as reducing the decomposition of liquid electrolytes, shorten the preparation period, solve leakage, and inhibit growth.

Active Publication Date: 2019-10-18
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent CN106654366A discloses a plastic crystal polymer electrolyte material prepared by in-situ polymerization. The plastic crystal polymer electrolyte membrane is obtained after heating in-situ polymerization of a mixed solution of monomers, initiators, crosslinking agents, lithium salts, and plastic crystals. ; This patent reduces the decomposition of the liquid electrolyte in the electrolyte by adding plastic crystals and prevents the leakage of the liquid electrolyte, but the impurities in the plastic crystals will still inevitably cause the liquid electrolyte to decompose in the high-voltage section

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  • In-situ preparation method and application of polymer electrolyte

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Embodiment 1

[0029] The in-situ preparation method of a polymer electrolyte provided in this example is as follows:

[0030] S1: Under the condition of anhydrous and oxygen isolation, the monomer methyl methacrylate and polyethylene glycol methyl ether methacrylate with a relative molecular mass of 300, the initiator 2-bromophenyl acetate and lithium Salt lithium perchlorate reaction raw materials are mixed, stir to form precursor solution A1; Methyl methacrylate, polyethylene glycol methyl ether methacrylate, 2-bromophenyl acetate, lithium perchlorate molar ratio is 20:10:1:6.

[0031] The specific configuration process is: S1: Weigh 0.1425g lithium perchlorate in the glove box and put it into the eggplant-shaped bottle, take 0.5ml methyl methacrylate and 1ml polyethylene glycol methyl ether methacrylate and add it to the eggplant-shaped bottle In the bottle, after 20 minutes of magnetic stirring, 3 microliters of ethyl 2-bromophenylacetate was added, and the stirring was continued for 2...

Embodiment 2

[0035] The difference between embodiment 2 and embodiment 1 is that the monomer is butyl methacrylate and polyethylene glycol methyl ether methacrylate with a relative molecular mass of 500, and the initiator is 2-iodo-2-methyl Propionitrile, the lithium salt is lithium hexafluorophosphate, stir well to form the precursor solution B1, the molar ratio of butyl methacrylate, polyethylene glycol methyl ether methacrylate, 2-iodo-2 methylpropionitrile, and lithium hexafluorophosphate is 20:30: 1:8; the rest of the steps are the same as in Example 1; the polymer B2 and the polymer electrolyte B3 with a number-average molecular mass of 45300 are obtained, and the lithium ion conductivity of the polymer electrolyte B3 measured at room temperature is 7.8×10 -5 s / cm.

Embodiment 3

[0037] The difference between Example 3 and Example 1 is that the monomers are methyl acrylate, styrene and polyethylene glycol methyl ether methacrylate with a relative molecular mass of 475, and the initiator is 2-iodo-2-methacrylate propionitrile, the lithium salt is lithium dioxalate borate, stir well to form a precursor solution C1, methyl acrylate, styrene, polyethylene glycol methyl ether methacrylate, 2-iodo-2-methylpropionitrile, dioxalic acid The molar ratio of lithium borate is 20:10:20:1:9; the remaining steps are the same as in Example 1; the polymer C2 and the polymer electrolyte C3 with a number average relative molecular weight of 47300 are obtained, and the polymer electrolyte C3 is at room temperature The lithium ion conductivity was measured to be 6.5×10 -5 s / cm.

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Abstract

The invention discloses an in-situ preparation method and application of a polymer electrolyte. According to the method, a monomer, an initiator and lithium salt are mixed under the condition that noligands are used; the monomer, the initiator and the lithium salt are uniformly stirred so as to form a precursor solution; a cellulose membrane is soaked in the precursor solution under a protectivegas; heating and a reaction are carried out for 24 hours, so that the monomer is subjected to an atom transfer radical polymerization reaction, so that a polymer and a polymer electrolyte are obtained; and the polymer and the polymer electrolyte are applied to a lithium battery. With the in-situ preparation method and the application of the polymer electrolyte of the invention adopted, the defectssuch as long preparation period, complex process route, organic solvent retention, and introduction of impurities of an existing polymer electrolyte can be eliminated; a technological process is simplified; the growth of lithium dendrites is inhibited; and the problem of electrolyte leakage can be thoroughly solved. With the novel method adopted, the polymer electrolyte for the lithium battery can be simply and effectively prepared.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis and lithium battery application, and more specifically relates to an in-situ preparation method and application of a polymer electrolyte. Background technique [0002] Lithium battery is undoubtedly one of the epoch-making energy storage technologies, because its energy density and reversibility are far superior to other secondary batteries, and it also has the advantages of high specific energy, good safety performance and excellent processing performance. Lithium batteries have penetrated into every aspect of life, from consumer electronics to large-scale energy storage products such as the automotive industry. [0003] Traditional lithium batteries use organic liquid electrolytes that are volatile, flammable, and leaky, which poses great safety hazards. The all-solid-state lithium battery prepared with solid polymer electrolyte can avoid the safety problems caused by liquid electroly...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/052
CPCH01M10/052H01M10/0565H01M10/058H01M2300/0082H01M2300/0085Y02E60/10Y02P70/50
Inventor 薛志刚于丽平张永王计嵘周兴平解孝林
Owner HUAZHONG UNIV OF SCI & TECH
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