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Large Pi system polyimide cross-linked polymer for negative electrode of lithium ion battery

A technology of cross-linked polymer and polyimide, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of simple and easy preparation process, mild synthesis conditions and low price

Inactive Publication Date: 2015-09-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on the mechanism of its lithium storage is still in the exploratory stage.

Method used

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  • Large Pi system polyimide cross-linked polymer for negative electrode of lithium ion battery
  • Large Pi system polyimide cross-linked polymer for negative electrode of lithium ion battery
  • Large Pi system polyimide cross-linked polymer for negative electrode of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1) Take 10mmol of 1,4,5,8-naphthalene methanecarboxylic dianhydride and 15mmol of melamine in a 150mL round bottom flask, add 50mL of N,N-dimethylformamide solution, and stir until the solids are evenly mixed. Under the protection of nitrogen, the reaction was heated to reflux and stirred overnight. Cool to room temperature, filter with suction, wash with absolute ethanol, and dry under vacuum at 75°C for 10h. Heat treatment at 300-500°C for 1-8h in a nitrogen atmosphere. The obtained polymer material was designated as PI-1.

[0032] 2) Preparation of lithium-ion battery negative electrode

[0033] Weigh the above polyimide material (active material), acetylene black, polyvinylidene fluoride (PVDF) (PVDF is dissolved in N-methylpyrrolidone in advance) according to the mass ratio of 5:3:2, and mix the three evenly to form Slurry: Apply the slurry evenly on the copper foil, dry it at 120°C, compact the pole piece, and cut it into thin slices with a diameter of 16mm to ...

Embodiment 2

[0036] 1) Take 10mmol of pyromellitic dianhydride and 15mmol of melamine in a 150mL round bottom flask, add 50mL of N,N-dimethylformamide solution, and stir until the solids are evenly mixed. Under the protection of nitrogen, the reaction was heated to reflux and stirred overnight. Cool to room temperature, filter with suction, wash with absolute ethanol, and dry under vacuum at 75°C for 10h. Heat treatment at 300-500°C for 1-8h in a nitrogen atmosphere. The resulting polymer material was designated as PI-2.

[0037] 2) Preparation of lithium-ion battery negative electrode

[0038] Weigh the above polyimide material (active material), acetylene black, polyvinylidene fluoride (PVDF) (PVDF is dissolved in N-methylpyrrolidone in advance) according to the mass ratio of 5:3:2, and mix the three evenly to form Slurry: Apply the slurry evenly on the copper foil, dry it at 120°C, compact the pole piece, and cut it into thin slices with a diameter of 16mm to make the pole piece. Af...

Embodiment 3

[0041]1) Take 10mmol of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) and 15mmol of melamine in a 150mL round bottom flask, add 50mL of N-methylpyrrolidone, and stir until the solids are evenly mixed. Under the protection of nitrogen, the reaction was heated to reflux and stirred overnight. Cool to room temperature, filter with suction, wash with absolute ethanol, and dry under vacuum at 75°C for 10h. Heat treatment at 300-500°C for 1-8h in a nitrogen atmosphere. The resulting polymer material was designated as PI-3.

[0042] 2) Preparation of lithium-ion battery negative electrode

[0043] Weigh the above polyimide material (active material), acetylene black, polyvinylidene fluoride (PVDF) (PVDF is dissolved in N-methylpyrrolidone in advance) according to the mass ratio of 5:3:2, and mix the three evenly to form Slurry: Apply the slurry evenly on the copper foil, dry it at 120°C, compact the pole piece, and cut it into thin slices with a diameter of 16mm to make the...

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Abstract

The invention relates to a large Pi system polyimide cross-linked polymer for a negative electrode of a lithium ion battery. Common polyacyl conjugated molecules which are used as a raw material and a polyamino compound are subjected to thermal polycondensation to form the stable large Pi system cross-linked polymer. The large Pi system polyimide cross-linked polymer prepared through thermal polycondensation shows excellent electrochemical performance when applied to a negative electrode of the lithium ion battery; in addition, the problem of heavy metal pollution caused by a traditional lithium ion battery negative material can be avoided; in structure, the large Pi system polyimide cross-linked polymer is relatively high in structure element conjugation degree and structure rigidity and is capable of improving battery capacity due to existence of a large quantity of imide groups; therefore, a formed three-dimensional network structure is relatively good in electrical conductivity and structure stability and can be applied to development of a lithium ion battery with high cycling stability and long cycling life.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long service life, no memory effect, no pollution, and small self-discharge, and are more and more widely used. With the wide application of lithium-ion batteries, higher requirements are put forward for the performance of its anode materials. In recent years, in order to meet the demand for batteries with high energy density and excellent cycle characteristics, some elements with semiconductor properties, such as silicon (Si), germanium (Ge) and tin (Sn), have been widely used due to their high theoretical capacity. applications have been extensively studied. However, the biggest challenge in adopting metals as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60C08G73/10
CPCC08G73/1082H01M4/606H01M10/0525Y02E60/10
Inventor 李忠涛周景艳徐荣飞吴明铂吴文婷
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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