Composite electrolyte based on porous organic compound and preparation method and application thereof

An organic compound and composite electrolyte technology, applied in the field of electrochemistry, can solve the problems of narrow electrochemical window, difficult in-situ composite, easy agglomeration, etc. Effect

Pending Publication Date: 2022-05-31
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are some other problems in organic electrolytes: the electrochemical window is narrow, which is difficult to match with the newly developed high-voltage cathode materials and high-capacity metal lithium anodes; lithium ions are not the only carriers, and when the operating current is large When the ion concentration gradient occurs, the internal resistance of the battery will increase and the performance of the battery will decrease; the working temperature is limited (safe working temperature is 0-40°C); it is easy to react with the negative electrode material to form a solid-electrolyte interface to continuously consume the electrolyte and Negative electrode, causing the battery capacity to continue to decrease
[0006] However, the solubility of the second phase particles in the current composite electrolyte is not good or has no solubility (such as inorganic particles), which makes it difficult to disperse the second phase particles, or even easy to agglomerate, making it difficult to use in-situ recombination; and the existing second phase particles are also Little ability to split the electrolyte salt, resulting in low ionic conductivity of the electrolyte

Method used

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  • Composite electrolyte based on porous organic compound and preparation method and application thereof
  • Composite electrolyte based on porous organic compound and preparation method and application thereof
  • Composite electrolyte based on porous organic compound and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1 g of laboratory prepared polyamine macrocyclic porous organic compound RCC1 powder was dissolved in 10 mL of chloroform. 3mL of commercially available 4M hydrochloric acid / dioxane solution was added dropwise to the above solution to obtain a white precipitate RCC1-Cl. After the precipitate was washed, 10mL of 10% mass fraction of lithium perchlorate-ethanol solution was added, and heated and stirred. The lithium perchlorate-ethanol solution was replaced twice in the middle to obtain RCC1-ClO 4 . The porous organic compound RCC1-ClO 4 The specific preparation process of figure 1 shown.

Embodiment 2

[0058] 5 mg of laboratory prepared RCC1-ClO 4 Dissolve in 2 mL of methanol to give solution 1. Polyethylene oxide (PEO) and LiClO 4 Dissolve in acetonitrile at a molar ratio of 8:1 to give solution 2, in which PEO and LiClO 4 The total weight accounts for 10wt%. Mix solution 1 and solution 2 in a glass bottle by magnetic stirring (where RCC1-ClO 4 The mass fraction of 5wt% PEO / LiClO 4 The mass fraction of 95 wt%), a uniformly mixed composite electrolyte solution based on porous organic compounds was obtained after 12 h. Then, the mixed solution was cast into the small round hole of the PTFE mold, and the thickness of the electrolyte membrane could be controlled according to the different amount added, and it was vacuum-dried at 60°C and then stored in an argon glove box. One week to remove the residual solvent or trace water in the membrane to obtain a porous organic compound solid-state composite electrolyte membrane.

[0059] The SEM morphology of the composite electro...

Embodiment 3

[0061] Lithium iron phosphate powder: AB (acetylene black): PVDF was dispersed in N-methylpyrrolidone (NMP) in a mass ratio of 92:5:3 to obtain a solid-state battery positive electrode slurry. The positive electrode was obtained after the positive electrode slurry was coated and dried, and then the composite electrolyte solution based on the porous organic compound of Example 2 was coated on the surface of the positive electrode. After drying, it was assembled with the lithium negative electrode to form a solid-state battery, which was heated and melted at 70 °C for 24 hours. Part of the electrolyte penetrates into the positive electrode for ion conduction. The solid-state battery has good cycle performance at 70 °C, and the cycle performance of the battery is shown in the figure below. Image 6 and 7 shown.

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PUM

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Abstract

The invention relates to a composite electrolyte based on a porous organic compound as well as a preparation method and application of the composite electrolyte. The composite electrolyte comprises a polymer matrix, electrolyte salt and the porous organic compound, the porous organic compound includes a positively charged porous organic compound backbone host and an anionic guest located around the porous organic compound backbone host. The free degree of cations in the composite electrolyte is improved, rapid ion conduction is realized, and the ion transference number of the electrolyte is high. The electrolyte is a solid electrolyte, and the safety performance of the battery is improved. The method has the advantages of mild production conditions, no need of expensive production equipment, simple and convenient operation process, controllability, good repeatability and stability, and easy realization of large-scale batch preparation. The material is high in ionic conductivity and good in thermal stability.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a composite electrolyte based on a porous organic compound and a preparation method and application thereof. Background technique [0002] Lithium battery safety has always been a concern of the industry. At present, commercial lithium-ion batteries have problems such as flammability of organic electrolytes and easy formation of lithium dendrites. Once the battery is short-circuited, a large amount of heat will be released inside the battery, which will cause the organic electrolyte to burn and cause serious safety hazards. Even the current "star" powered car Tesla has suffered more than a dozen fires and explosions in recent years. In addition, organic electrolytes also have some other problems: the electrochemical window is narrow, and it is difficult to match the newly developed high-voltage cathode materials and high-capacity metal lithium anodes; lithium ions are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058H01M10/42
CPCH01M10/0565H01M10/0525H01M10/058H01M10/4235H01M2300/0085H01M2300/0091H01M2300/0082Y02E60/10Y02P70/50
Inventor 李静齐楫真沈炎宾陈立桅
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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