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Benzimidazole-containing single-ion polymer electrolyte as well as preparation method and application thereof

A benzimidazole and benzimidazole-functional technology, applied in the field of single-ion polymer electrolytes, can solve the problems affecting the ionic conductivity of gel electrolytes and the difficulty in controlling the uniformity of gel electrolyte membranes, so as to increase the number of lithium ion migration, Effect of inhibiting the growth of lithium dendrites and improving dimensional stability

Pending Publication Date: 2022-08-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN 112164824 B prepared an anion acceptor-type single-ion conductor flame-retardant polymer gel electrolyte. The electrolyte uses electrospun PVDF membrane as the substrate. Although the mechanical strength of the polymer gel electrolyte can be improved, the PVDF membrane To a certain extent, it will affect the ionic conductivity of the gel electrolyte, and it is not easy to control the uniformity of the gel electrolyte membrane

Method used

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  • Benzimidazole-containing single-ion polymer electrolyte as well as preparation method and application thereof
  • Benzimidazole-containing single-ion polymer electrolyte as well as preparation method and application thereof
  • Benzimidazole-containing single-ion polymer electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Synthesis of Monoionic Polymer Gel Electrolyte 1

[0040] (1) Synthesis of 2,2'-bis(propenyl)-5,5'-bibenzimidazole

[0041] 4.30g of α-methacrylic acid, 5.41g of 3,3'-diaminobenzidine, 10mL of polyphosphoric acid and 40mL of phosphoric acid were added to a 100mL three-necked flask, and in N 2 Under the environment, mechanical stirring, 185 ℃ reaction 5h. After the reaction is completed, the solution is poured into distilled water, then sodium bicarbonate is added, neutralized to pH=7, and precipitation will appear in the solution, then suction filtration, washing with water, recrystallization from ethanol / water solution, and vacuum drying to obtain 2,2' - bis(propenyl)-5,5'-bibenzimidazole.

[0042] Wherein, the synthetic route of 2,2'-bis(propenyl)-5,5'-bibenzimidazole:

[0043]

[0044] In addition, the chemical structure of 2,2'-bis(propenyl)-5,5'-bibenzimidazole is as follows:

[0045]

[0046] The chemical structures above label the active hydro...

Embodiment 2

[0060] Example 2 Synthesis of Monoionic Polymer Gel Electrolyte 2

[0061] 0.0628g of 2,2'-bis(propenyl)-5,5'-bibenzimidazole, 0.1113g of hexa-(eugenol)cyclotriphosphazene, 0.1386g of (trifluoromethanesulfonyl)-( Lithium vinylsulfonyl)imide and 0.0051 g of azobisisobutyronitrile were dissolved in 3.7 mL of N-methylpyrrolidone to obtain a transparent casting solution. After the casting liquid was passed into nitrogen for 2 hours, it was cast on a clean glass plate, reacted at 100 °C for 10 hours, and a cross-linked single-ion polymer electrolyte membrane was formed in situ, and then dried at 140 °C for 30 hours to completely remove the solvent. , to obtain a single-ion polymer solid electrolyte. The single-ion polymer gel electrolyte 2 can be obtained by soaking the polymer solid electrolyte in ethylene carbonate / dimethyl carbonate (volume ratio of 1:1).

[0062] The single-ion polymer gel electrolyte 2 obtained in Example 2 was subjected to relevant electrochemical performan...

Embodiment 3

[0063] Example 3 Synthesis of Single Ion Polymer Gel Electrolyte 3

[0064] 0.0942g of 2,2'-bis(propenyl)-5,5'-bibenzimidazole, 0.1113g of hexa-(eugenol)cyclotriphosphazene, 0.1663g of (trifluoromethanesulfonyl)-( Lithium vinylsulfonyl)imide and 0.0051 g of azobisisobutyronitrile were dissolved in 4.4 mL of N-methylpyrrolidone to obtain a transparent casting solution. After the casting liquid was passed into nitrogen for 2 hours, it was cast on a clean glass plate, reacted at 100 °C for 12 hours, and a cross-linked single-ion polymer electrolyte membrane was formed in situ, and then dried at 140 °C for 36 hours to completely remove the solvent. , to obtain a single-ion polymer solid electrolyte. The single-ion polymer gel electrolyte 3 can be obtained by soaking the polymer solid electrolyte in ethylene carbonate / dimethyl carbonate (volume ratio is 1:1).

[0065] The single-ion polymer gel electrolyte 3 obtained in Example 3 was subjected to relevant electrochemical performa...

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Abstract

The invention provides a benzimidazole-containing single-ion polymer electrolyte as well as a preparation method and application thereof. Firstly, a novel cross-linking agent containing a benzimidazole functional group is synthesized, then the cross-linking agent is mixed with a lithium salt monomer containing double bonds, an initiator and a derivative of polyfunctional cyclotriphosphazene, a single-ion polymer solid electrolyte with a cross-linked network structure is generated in situ through free radical polymerization, and then the single-ion polymer solid electrolyte is soaked in a plasticizer to obtain the lithium ion battery electrolyte. And obtaining the single-ion polymer gel electrolyte. The prepared single-ion polymer gel electrolyte has high room-temperature ionic conductivity, high lithium ion transference number, wide electrochemical window and excellent flame retardant property, can effectively inhibit the growth of lithium dendrites, and is widely applied to the field of lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and particularly relates to a single-ion polymer electrolyte containing benzimidazole, a preparation method and an application thereof. Background technique [0002] With the rapid development of electric vehicles, smart grids and the upgrading of portable electronic products, people are committed to developing an energy storage technology with high energy density (≥500Wh / kg) and high safety. Although traditional lithium-ion batteries are widely used due to their advantages of high output voltage, no memory effect, and low self-discharge, they still cannot meet people's needs for high energy density and high power density energy storage batteries. Lithium metal has the advantages of the lowest redox potential, the highest theoretical specific capacity, and low density. It is very important to use it as an anode material to develop lithium metal batteries with higher energy density, long...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525Y02P70/50
Inventor 刘佰军单曾亮路宽熊臣呼微
Owner JILIN UNIV
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