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Polyperylene tetracarboxylic diimide, preparation method thereof and application of polyperylene tetracarboxylic diimide in lithium/sodium battery

A technology of polyperylene tetracarboximide and perylene tetracarboximide is applied in the field of positive electrode materials for lithium/sodium ion batteries, which can solve the problems of poor cycle performance and high solubility.

Active Publication Date: 2022-05-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a kind of polyperylene tetracarbonyl diimide, its preparation method and its application in lithium / sodium battery. Based on ball milling technology, perylene tetracarbonyl diimide is polymerized to prepare a conjugated system with larger structure, Polyperylenetetracarboximide with better thermal stability, lower solubility and higher conductivity to solve the problems of high solubility and poor cycle performance when organic small molecule compounds are used as electrode materials, and apply it to lithium / sodium Ion battery system

Method used

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  • Polyperylene tetracarboxylic diimide, preparation method thereof and application of polyperylene tetracarboxylic diimide in lithium/sodium battery
  • Polyperylene tetracarboxylic diimide, preparation method thereof and application of polyperylene tetracarboxylic diimide in lithium/sodium battery
  • Polyperylene tetracarboxylic diimide, preparation method thereof and application of polyperylene tetracarboxylic diimide in lithium/sodium battery

Examples

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Embodiment 1

[0046] Mix perylene tetracarbonyl diimide or polyperylene tetracarbonyl diimide with Super P evenly, dissolve PVDF in NMP and prepare a mass concentration of 3%, then mix the NMP solution containing PVDF with perylene tetracarbonyl diimide Amine or polyperylenetetracarboximide and Super P powders were mixed and ground for 5-10 min, wherein the mass ratio of perylenetetracarboximide or polyperylenetetracarboximide, Super P and PVDF was 70 :20:10, the total mass of the three weighed is 0.1 g. After mixing, quickly spread it on a copper foil with a thickness of 10 μm, then place it in an oven at 60 °C to dry overnight, and cut it with a cutting machine to obtain a positive electrode sheet with a diameter of 13 mm. The loading of perylenetetracarboximide on copper foil is 0.8 mg cm -2 ~1.2 mg cm -2 . 1 M NaPF as the liquid electrolyte for Na-ion batteries 6 ethylene carbonate / diethyl carbonate / propylene carbonate (volume ratio 45:45:10) solution, the amount added is 120-150 μL...

Embodiment 2

[0048] When assembling a lithium-ion battery, the preparation of the positive electrode sheet is the same as in Example 1, and the loading capacity of the active material (perylenetetracarboximide or polyperylenetetracarboximide, the same below) is 0.9 mg cm -2 ~1.0 mg cm -2 . The selected liquid electrolyte is 1 MLiPF 6 Ethylene carbonate / dimethyl carbonate / ethyl methyl carbonate (volume ratio 1:1:1) solution, the addition volume is 120-150 μL, the separator is polypropylene (Celgard 2500), and the thickness is 0.45 mm lithium sheet Do the negative pole.

Embodiment 3

[0050] Replace Super P in Example 1 with carbon nanotubes, and other steps are the same as in Example 1 to prepare a positive electrode sheet for a sodium-ion battery, wherein the active material loading is 0.7 mg cm -2 ~1.0 mg cm -2 . 1 M NaPF as the liquid electrolyte for Na-ion batteries 6 The solution of ethylene carbonate / diethyl carbonate / propylene carbonate (volume ratio 45:45:10) was added in an amount of 120-150 μL, and the septum was glass fiber (Whatman, pore size 2.7 μm), with a thickness of 0.45 mm The sodium sheet is used as the negative electrode, and the sodium-ion battery is assembled.

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Abstract

The invention discloses polyperylene tetracarboxylic diimide, a preparation method of the polyperylene tetracarboxylic diimide and application of the polyperylene tetracarboxylic diimide in a lithium / sodium battery, and belongs to the technical field of lithium / sodium ion battery positive electrode materials. The preparation method comprises the following steps: uniformly mixing 3, 4, 9, 10-perylenetetracarboxylic diimide and ferric trichloride in a ball milling tank, carrying out ball milling reaction for 20-30 minutes by using a ball mill, washing the obtained product with methanol, and drying to obtain poly-3, 4, 9, 10-perylenetetracarboxylic diimide, and the mass ratio of 3, 4, 9, 10-perylenetetracarboxylic diimide to ferric trichloride is 1: (2-3). Detection on a lithium ion battery or a sodium ion battery assembled by the battery material shows that compared with an unpolymerized perylene tetracarboxylic diimide positive electrode material, the polyperylene tetracarboxylic diimide positive electrode material disclosed by the invention shows better thermal stability and more excellent cycling stability and rate capability.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium / sodium ion batteries, and in particular relates to polyperylenetetracarboximide, its preparation method and its application in lithium / sodium batteries. Background technique [0002] A lithium / sodium ion battery consists of a positive electrode, a negative electrode, an electrolyte, and a separator. The electrochemical performance of Li / Na-ion batteries largely depends on the active materials of the electrodes. Among them, the positive electrode material plays an important role in determining the performance of lithium / sodium ion batteries, is the decisive factor in determining the battery capacity, and affects the cost of the battery. Since the design and capacity of most Li / Na-ion batteries are limited by the cathode materials, it becomes crucial to design and fabricate cathode materials that can overcome the weaknesses of Li / Na-ion battery systems. An approach to addres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/12H01M4/60H01M10/0525H01M10/054
CPCC08G61/122H01M4/606H01M10/0525H01M10/054C08G2261/11C08G2261/3241C08G2261/43C08G2261/18H01M2004/028Y02E60/10
Inventor 郑金云刘新新李文杰冯祥明陈卫华
Owner ZHENGZHOU UNIV
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