Fused ring compound-based lithium battery negative electrode material and preparation method thereof

A technology of a fused ring pyranyl salt compound and a fused ring pyridine salt compound, which is applied in the field of negative electrode materials for lithium ion batteries, can solve problems such as poor battery cycle stability, achieve strong operability, improve cycle stability, rate performance, and high capacity Effect

Inactive Publication Date: 2018-06-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is mainly because small organic molecules are easily dissolved in the electrolyte, resulting in poor cycle stability of the battery.

Method used

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  • Fused ring compound-based lithium battery negative electrode material and preparation method thereof
  • Fused ring compound-based lithium battery negative electrode material and preparation method thereof
  • Fused ring compound-based lithium battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of 4,4-(1,4-phenyl)bis(2,6-diphenylpyranyl boron tetrafluoride) (PBDPT)

[0039]Terephthalaldehyde (4.948g, 37mmol) and acetophenone (17.7g, 148mmol) were dissolved in 50mL of toluene, then boron trifluoride ether solution (18.75mL) was added, and the resulting mixed solution was refluxed under nitrogen atmosphere for 5 hours, a reaction solution was obtained. The reaction solution was cooled to room temperature, then diethyl ether was added, and the crude product was obtained by filtration. The crude product was dried, recrystallized with acetonitrile, filtered to obtain a yellow solid, and the 4,4-(1,4-phenyl)bis(2, 6-diphenylpyranyl boron tetrafluoride) (PBDPT). The electrochemical mechanism of the deintercalation of lithium ions in PBDPT is as follows: figure 2 (a) shown.

Embodiment 2

[0041] Preparation of 1,4-bis(1,2,6-triphenylpyridine-4-)benzene boron ditetrafluoride (BTPPT)

[0042] Dissolve PBDPT (0.744g, 1.04mmol) and aniline (0.194g, 2.08mmol) in 10mL of dimethyl sulfoxide, then heat the resulting mixed solution to 130°C under a nitrogen atmosphere, and continue the reaction for 24 hours to obtain a reaction solution . The reaction solution was cooled to room temperature, then 300 mL of water was added, and the crude product was obtained by filtration. After the crude product was dried, it was recrystallized with a mixed solvent of methanol / ethanol (v / v, 1 / 1), filtered to obtain a light yellow solid, and the 1 ,4-bis(1,2,6-triphenylpyridine-4-)benzene boron tetrafluoride salt (BTPPT). The electrochemical mechanism of lithium ion deintercalation in BTPPT is as follows: figure 2 (c) shown.

Embodiment 3

[0044] Preparation of 1,1'-p-phenylene-bis(2,4,6-triphenylpyridine) boron tetrafluoride (PPBTPT)

[0045] TPT (0.82g, 2.08mmol) and p-phenylenediamine (0.11g, 1.04mmol) were dissolved in 10mL of dimethyl sulfoxide, and the resulting mixed solution was heated to 130°C under a nitrogen atmosphere, and the reaction was continued for 24 hours. A reaction solution was obtained. The reaction solution was cooled to room temperature, then 300 mL of water was added, and the crude product was obtained by filtration. After the crude product was dried, it was recrystallized with a mixed solvent of methanol / ethanol (v / v, 1 / 1), filtered to obtain a light yellow solid, and the 1 , 1'-p-phenylene-bis(2,4,6-triphenylpyridine) boron tetrafluoride (PPBTPT). The electrochemical mechanism of lithium ion deintercalation of PPBTPT is as follows: figure 2 (d) shown.

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Abstract

The invention discloses an organic molecule-carbon black compound-containing lithium ion battery negative electrode material and a preparation method thereof. The negative electrode material comprisesan organic molecule-carbon black compound, wherein the organic molecule-carbon black compound is formed from organic molecule and carbon black, and the organic molecule is selected from at least oneof a fused ring pyranium salt compound and a fused ring pyridinium compound. The preparation method comprises the following steps of dissolving the organic molecule in acetone; adding the carbon black, and continuing to stir; drying a solvent to obtain the organic molecule-carbon black compound; adding a bonding agent to prepare battery paste; and coating the battery paste on a copper foil, and performing drying to obtain the organic molecule-carbon black compound-containing lithium ion battery negative electrode material. The negative electrode material has favorable specific capacity and cycle stability, and high capacity can be achieved under a room temperature. The preparation method is simple in step, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of lithium ion battery negative electrode materials, in particular to an organic negative electrode material, in particular to a lithium ion battery negative electrode material based on a fused-ring pyryl salt and / or a condensed-ring pyridinium salt compound and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of portable and wearable electronic devices, people's demand for high-performance energy storage devices is increasing, and the market's demand for lithium-ion battery production and energy density has skyrocketed. Therefore, new low-cost materials are looking for Improving its capacity has become a hot and difficult point at present. Lithium-ion batteries are currently the most mature secondary batteries. In order to make lithium-ion batteries have high energy density, high power density, long cycle life and high work safety, it is necessary to have a good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M4/13H01M4/139H01M4/04H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/362H01M4/60H01M4/62H01M10/0525Y02E60/10
Inventor 马列吴东清鲁登杨鹏黄涛井凡
Owner SHANGHAI JIAO TONG UNIV
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