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A kind of porous organic compound electrolyte and its preparation method and application

An organic compound and electrolyte technology, applied in the field of electrochemistry, can solve the problems of low room temperature ionic conductivity, high cost, harsh preparation conditions, etc., and achieve the effect of realizing ion conduction, increasing the degree of freedom, and high ion migration number

Active Publication Date: 2021-12-14
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, solid electrolytes can be divided into inorganic electrolytes and polymer electrolytes. Inorganic electrolytes have high ionic conductivity at room temperature, but their preparation conditions are harsh and the cost is too high, while polymer electrolytes have good flexibility. and ease of processing, but its disadvantage is that the room temperature ionic conductivity is low, generally at 10 -7 -10 -5 Within the range of S / cm

Method used

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  • A kind of porous organic compound electrolyte and its preparation method and application
  • A kind of porous organic compound electrolyte and its preparation method and application
  • A kind of porous organic compound electrolyte and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Dissolve 1 g of the laboratory-prepared polyamine macrocyclic porous organic compound RCC1 powder in 10 mL of chloroform. Add 3 mL of commercially available 4 M hydrochloric acid / dioxane solution dropwise to the above solution to obtain white precipitate RCC1-Cl, wash the precipitate and add 10 mL of 10% mass fraction lithium perchlorate-ethanol solution, heat and stir . Replace the lithium perchlorate-ethanol solution twice in the middle to obtain RCC1-ClO 4 . 1g RCC1-ClO 4 Composite with 0.68g lithium perchlorate to obtain porous organic compound electrolyte Li-RCC1-ClO 4 . Its electron microscope appearance is as image 3 As shown, the macroscopic photos after tableting are as follows Figure 4 As shown, the conductivity as Figure 5 As shown, the electrochemical window as Figure 6 As shown, thermal stability as Figure 7 shown.

Embodiment 2

[0048] Dissolve 1 g of the laboratory-prepared polyamine macrocyclic porous organic compound TpEDA powder in 10 mL of N,N-dimethylformamide (DMF). Add 5 mL of commercially available 2 M sulfuric acid / dioxane solution dropwise to the above solution to obtain brown-red precipitate TpEDA-SO 4 After washing the precipitate, add 10 mL of 10% by mass lithium hexafluorophosphate-ethyl acetate solution, heat and stir. Replace the lithium hexafluorophosphate-ethyl acetate solution twice in the middle to obtain TpEDA-PF 6 . 2g TpEDA-PF 6 Composite with 1.3g lithium hexafluorophosphate to obtain porous organic compound electrolyte Li-TpEDA-PF 6 .

Embodiment 3

[0050] Dissolve 1 g of the laboratory-prepared polyamine macrocyclic porous organic compound TpPNDA powder in 10 mL of dimethyl sulfoxide (DMSO). Add 3 mL of commercially available 4 M sulfuric acid / dioxane solution dropwise to the above solution to obtain a brownish-yellow precipitate TpPNDA-Cl, wash the precipitate and add 10 mL of 10% mass fraction lithium trifluoromethanesulfonimide - n-butanol solution, heated and stirred. The lithium trifluoromethanesulfonimide-n-butanol solution was replaced twice in the middle to obtain TpPNDA-TFSI. 5g TpPNDA-TFSI was combined with 3.8g lithium trifluoromethanesulfonimide to obtain a porous organic compound electrolyte Li-TpPNDA-TFSI.

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Abstract

The invention relates to a porous organic compound electrolyte and its preparation method and application. The porous organic compound electrolyte is composed of a skeleton and an electrolyte salt. points of anions. The invention improves the degree of freedom of cations in the electrolyte salt, realizes fast ion conduction, and makes the electrolyte ion migration number high. The invention is a pure solid electrolyte, which improves the safety performance and electrochemical window of the battery. The production condition of the present invention is mild, no expensive production equipment is needed, the operation process is simple and adjustable, the repeatability and stability are good, and large-scale batch preparation is easy to realize. The material has high ionic conductivity, wide electrochemical window, and good thermal stability, and is not only suitable for solid-state electrolytes, but also for cathode ion additives.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a porous organic compound electrolyte and its preparation method and application. Background technique [0002] The safety of lithium batteries has always been a concern of the industry. Due to the continuous improvement of energy density requirements at the application and policy levels, the trend of ternary batteries becoming the mainstream technology route is irreversible. But to this day, the safety of ternary batteries has not been well resolved. Even Tesla, which claims to be the best BMS in the world, has continued to have safety accidents. The safety of ternary batteries is still questioned by everyone. . With the development of new energy vehicles, batteries with high energy density and high safety have become the inevitable goal of the market. Replacing traditional electrolytes with solid electrolytes is the only way to essentially improve the safety of li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/0565H01M4/62H01M10/05H01M10/0525
CPCH01M10/056H01M10/0565H01M4/62H01M10/05H01M10/0525Y02E60/10
Inventor 李静沈炎宾陈宏伟卢威吴晓东陈立桅
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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