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Preparation method of polyamide-based gel polymer electrolyte with multi-network structure

A technology of gel polymer and network structure, which is applied in the direction of solid electrolyte, non-aqueous electrolyte, electrolyte immobilization/gelation, etc. It can solve the problems of poor electrode wettability, reduced ionic conductivity, and deterioration of the interface between positive and negative electrodes. Achieve the effects of strengthening cross-linking degree, high oxidation resistance and easy operation

Pending Publication Date: 2021-05-25
广东聚圣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the addition of a large amount of insulating polymers in the commonly used gel polymer electrolytes, there are serious problems such as excessive reduction in ionic conductivity, poor electrode wettability, and deterioration of the interface between positive and negative electrodes.

Method used

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  • Preparation method of polyamide-based gel polymer electrolyte with multi-network structure
  • Preparation method of polyamide-based gel polymer electrolyte with multi-network structure
  • Preparation method of polyamide-based gel polymer electrolyte with multi-network structure

Examples

Experimental program
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Effect test

Embodiment example 1

[0030] Accurately weigh 0.06 g of N,N-methylenebisacrylamide and dissolve it in an electrolyte system with a ratio of ethylene carbonate to ethyl methyl carbonate of 2:3, and the lithium salt is lithium bistrifluoromethanesulfonylimide (bis The consumption of lithium trifluoromethanesulfonylimide is 0.397g), and the consumption of electrolyte is 1.94g. After stirring for 10min under an argon protective atmosphere, add 0.001g of azobisisobutyronitrile initiator in the mixed solution and continue to stir A gel polymer electrolyte precursor solution is obtained.

[0031] In a glove box protected by argon and with water and oxygen contents less than 1ppm, the prepared precursor solution was injected into a porous cellulose membrane, and two stainless steel sheets were selected as blocking electrodes to assemble a button battery, and then the battery was placed Heated at 60°C for 4h for in-situ polymerization. Electrochemical workstations were used to perform impedance spectroscop...

Embodiment example 2

[0033] Choose LiNi 0.6 co 0.2 mn 0.2 o 2 The ternary material is used as the positive electrode, and the lithium sheet is used as the negative electrode. In a glove box protected by argon and with water and oxygen contents less than 1ppm, the precursor solution in Example 1 is injected into the porous cellulose membrane to assemble a ternary material. / lithium metal battery, and then place the battery at 60° C. for 4 h for in-situ polymerization to obtain a gel polymer electrolyte battery. As a comparison, the liquid ternary material / lithium metal battery was assembled with the same organic electrolyte, and the two ternary material / lithium metal batteries assembled above were subjected to a constant current charge and discharge test at a rate of 1C, and the test voltage range was 3.0-4.3V , the measured initial discharge specific capacity of the gel ternary material / lithium metal battery is 155.2mAh / g, which can be cycled stably for 800 cycles, and the capacity retention ra...

Embodiment example 3

[0035] Accurately weigh 0.09 g of N-allyl formamide and dissolve it in an electrolyte system in which the ratio of ethylene carbonate to dimethyl carbonate is 1:1, and the lithium salt is lithium bistrifluoromethanesulfonyl imide (bistrifluoromethane The consumption of lithium sulfonylimide is 0.596g), and the consumption of electrolyte is 2.91g. After stirring for 10min under an argon protective atmosphere, add 0.001g of azobisisobutyronitrile initiator in the mixed solution, and continue to stir to obtain a gel Polymer Electrolyte Precursor Solution.

[0036] In a glove box protected by argon and with water content and oxygen content less than 1ppm, inject the prepared precursor solution into a porous cellulose membrane, and select two lithium sheets to assemble a symmetrical battery, and then place the battery at 60°C Heating for 4h in situ polymerization. The electrochemical workstation was used to carry out the steady-state current polarization test and the impedance spe...

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Abstract

The invention relates to a polyamide-based gel polymer electrolyte with a multi-network structure and a preparation method of the polyamide-based gel polymer electrolyte, and belongs to the technical field of high-performance battery development. The gel polymer electrolyte is formed by polymerizing an amido monomer material, and hydrogen-bond interaction is formed between the amido monomer material and the porous support material. The preparation method comprises: fully and uniformly mixing the amido monomer material and the lithium ion battery liquid electrolyte which are prepared according to the designed components, polymerizing on the porous support material rich in hydroxyl and carboxyl to form a film, and obtaining the interface enhanced polyamide gel polymer electrolyte with the multi-network structure and high strength. The gel polymer electrolyte is reasonable in component design, the preparation process is simple and controllable, the obtained product is excellent in performance, and large-scale industrial production is facilitated.

Description

technical field [0001] The invention designs a polyamide-based gel polymer electrolyte with a multi-network structure and a preparation method thereof; it belongs to the technical field of high-performance battery development. Background technique [0002] Due to its high energy density, lithium-ion secondary batteries have become the preferred energy storage technology for hybrid electric vehicles, portable electronic devices and other fields. With the widespread application of lithium-ion batteries, the market has higher and higher requirements for their safety and light weight. How to design long-cycle life and high-safety lithium-ion batteries has become a hot issue in the development and application of secondary batteries today. [0003] Most of the current commercial lithium-ion battery electrolytes are liquid electrolytes, and there is a risk of electrolyte leakage during use. At the same time, the uneven deposition of lithium ions on the negative electrode is easy t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0565C08F122/38C08F126/02
CPCC08F122/385C08F126/02H01M10/0525H01M10/0565H01M2300/0082H01M2300/0085Y02E60/10
Inventor 韦伟峰陈敏健马骋
Owner 广东聚圣科技有限公司
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