A kind of in-situ preparation method and application of polymer electrolyte

An in-situ preparation and polymer technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolytes, solid electrolytes, etc., can solve the problems of reducing the decomposition of liquid electrolytes, shorten the preparation cycle, simplify the preparation process, and solve the problem of leakage Effect

Active Publication Date: 2020-12-04
HUAZHONG UNIV OF SCI & TECH
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  • Description
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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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  • A kind of 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 embodiment is as follows:

[0030] S1: Under the conditions of anhydrous and isolated oxygen, the monomer methyl methacrylate and the polyethylene glycol methyl ether methacrylate with a relative molecular mass of 300, the initiator 2-bromophenylacetate and lithium The reaction raw materials of salt lithium perchlorate are mixed, and the precursor liquid A1 is formed by stirring uniformly; the molar ratio of methyl methacrylate, polyethylene glycol methyl ether methacrylate, 2-bromophenyl ethyl acetate, and lithium perchlorate is 20:10:1:6.

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

Embodiment 2

[0035] The difference between Example 2 and Example 1 is that the monomers are butyl methacrylate and polyethylene glycol methyl ether methacrylate with a relative molecular mass of 500, and the initiator is 2-iodo-2-methyl methacrylate. Propionitrile, the lithium salt is lithium hexafluorophosphate, stir evenly to form precursor solution B1, the molar ratio of butyl methacrylate, polyethylene glycol methyl ether methacrylate, 2-iodo-2 methyl propionitrile, and lithium hexafluorophosphate is 20:30: 1:8; the remaining steps are the same as in Example 1; the polymer B2 and the polymer electrolyte B3 with a number average relative 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-methyl. Propionitrile, the lithium salt is lithium dioxalate borate, stir well to form precursor liquid 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 mass of 47300 are obtained, and the polymer electrolyte C3 is at room temperature. The measured lithium ion conductivity is 6.5×10 -5 s / cm.

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Abstract

The invention discloses an in-situ preparation method of a polymer electrolyte and its application. The method is to mix monomers, initiators and lithium salts without using ligands, and stir them uniformly to form a precursor solution. Under protective gas, immerse the cellulose membrane in the precursor solution, heat and react for 24 hours, so that the monomer undergoes atom transfer radical polymerization reaction, obtains polymer and polymer electrolyte, and applies it to lithium battery middle. The invention overcomes the disadvantages of the existing polymer electrolyte, such as long preparation period, complex process route, residue of organic solvent, introduction of impurities, etc., simplifies the process flow, inhibits the growth of lithium dendrites, and can completely solve the problem of electrolyte leakage . This is a novel and simple and effective method for preparing polymer electrolytes for lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis and lithium battery application, and more particularly 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 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, and have great potential safety hazards. All-solid-state lithium batteries prepared by using solid-state polymer electrolytes can avoid the safety problems caused by liqui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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