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Lithiation covalent organic framework composite polymer electrolyte as well as preparation and application thereof

A covalent organic framework and composite polymer technology, applied in the field of electrochemistry, can solve the problems of battery energy density improvement, high density, low intrinsic ionic conductivity, etc., to reduce potential barriers, improve interaction, and improve conductivity rate effect

Pending Publication Date: 2021-05-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional inorganic active fillers have the following problems: (1) When metal oxides are used as active fillers, high temperature treatment is usually required, such as Li 7 La 3 Zr 2 o 12 (>900℃)
(3) Metal compounds usually have a high density, and a large amount of addition is not conducive to the improvement of the overall energy density of the battery
However, due to its low intrinsic ionic conductivity, it has not been reported as an active filler in polymer electrolytes.

Method used

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  • Lithiation covalent organic framework composite polymer electrolyte as well as preparation and application thereof
  • Lithiation covalent organic framework composite polymer electrolyte as well as preparation and application thereof
  • Lithiation covalent organic framework composite polymer electrolyte as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: Preparation of lithiated covalent organic framework composite polymer electrolyte, the steps are as follows:

[0030] 1) Preparation of covalent organic framework: 63mg of 1,3,5-trialdehyde phloroglucinol (Tp), 84.7mg of 2,5-diaminobenzenesulfonic acid (Pa-SO 3 H), 0.6mL 1,4-dioxane, 2.4mL mesitylene, 0.6mL acetic acid solution with a concentration of 6mol / L, and sonicate for 10min. The reaction solution was frozen, evacuated, and melted with liquid nitrogen, and the operation was repeated three times. The reaction tube was placed in an oil bath and reacted at 120°C for 72h. After the reaction was completed, the solid product was collected by suction filtration, and washed three times with dimethylacetamide, deionized water, and acetone in sequence. After washing, the collected solid product was placed in a vacuum oven and dried at 120 °C for 12 h to obtain the covalent organic framework material TpPa-SO 3 H.

[0031] 2) Preparation of lithiated covalent ...

Embodiment 2

[0035] Example 2: Preparation of lithiated covalent organic framework composite polymer electrolyte, the steps are as follows:

[0036] 1) Preparation of covalent organic framework: 63mg of 1,3,5-trialdehyde phloroglucinol (Tp), 84.7mg of 2,5-diaminobenzenesulfonic acid (Pa-SO 3 H), 0.6mL 1,4-dioxane, 2.4mL mesitylene, 0.6mL acetic acid solution with a concentration of 6mol / L, and sonicate for 10min. The reaction solution was frozen, evacuated, and melted with liquid nitrogen, and the operation was repeated three times. The reaction tube was placed in an oil bath and reacted at 120°C for 72h. After the reaction was completed, the solid product was collected by suction filtration, and washed three times with dimethylacetamide, deionized water, and acetone in sequence. After washing, the collected solid product was placed in a vacuum oven and dried at 120 °C for 12 h to obtain the covalent organic framework material TpPa-SO 3 H.

[0037] 2) Preparation of lithiated covalent ...

Embodiment 3

[0040] Example 3: Preparation of lithiated covalent organic framework composite polymer electrolyte, the steps are as follows:

[0041] 1) Preparation of covalent organic framework: 63 mg of 1,3,5-trialdehyde phloroglucinol (Tp), 120.7 mg of 2,5-diamino-1,4-benzenediol were sequentially loaded into a Pyrex tube Sulfonic acid (Pa-Double-SO 3 H), 0.6mL 1,4-dioxane, 2.4mL mesitylene, 0.6mL acetic acid solution with a concentration of 6mol / L, and sonicate for 10min. The reaction solution was frozen, evacuated, and melted with liquid nitrogen, and the operation was repeated three times. The reaction tube was placed in an oil bath and reacted at 120°C for 72h. After the reaction was completed, the solid product was collected by suction filtration, and washed three times with dimethylacetamide, deionized water, and acetone in sequence. After washing, the collected solid product was placed in a vacuum oven and dried at 120°C for 12 hours to obtain the covalent organic framework mat...

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Abstract

The invention discloses a lithiation covalent organic framework composite polymer electrolyte as well as a preparation method and application thereof. The lithiation covalent organic framework composite polymer electrolyte comprises a lithiated covalent organic framework, a polymer and lithium salt. The lithium ion diffusion barrier is reduced through the interaction between the lithiated covalent organic framework and the polymer, and a rapid channel is provided between polymer chain segments, so that the lithium ion conductivity is improved. The invention further provides a solid-state lithium ion battery comprising the lithiation covalent organic framework composite polymer electrolyte. The lithiation covalent organic framework composite polymer electrolyte provided by the invention can improve electrochemical performances such as cycling stability, specific capacity, safety and the like of a battery, and the lithiation process is simple and convenient and the lithiation covalent organic framework composite polymer electrolyte has universality.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a lithiated covalent organic framework composite polymer electrolyte and a preparation method thereof, and the electrolyte is applied to a lithium ion battery. Background technique [0002] Solid-state lithium-ion batteries are generally composed of negative electrodes, positive electrodes, and solid electrolytes. Since volatile electrolytes are not added, they have high energy density and high safety, and are the development direction of the next-generation battery system. Polymer electrolytes are currently the most promising solid-state electrolyte systems due to their flexibility and good film-forming properties. However, polymers conduct lithium ions through chain segment thermal movement or local relaxation, and the ionic conductivity at room temperature is low, which is difficult to meet the needs of practical applications (Adv. Mater., 2019, 31, 1902029...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082Y02E60/10
Inventor 孙洁潘福生姚远
Owner TIANJIN UNIV
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