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Lithium ion battery organic positive electrode material and application thereof

A technology for lithium-ion batteries and cathode materials, applied in the field of preparation of lithium-ion cathode materials, can solve the problems of low output voltage and constraints on the energy density of organic lithium-ion batteries, achieve high redox potential, be conducive to cycle stability, and improve energy effect of density

Active Publication Date: 2019-11-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbonyl materials generally have low output voltage (2.0-2.5V, vs Li / Li + ), which undoubtedly greatly restricts the energy density of organic lithium-ion batteries

Method used

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  • Lithium ion battery organic positive electrode material and application thereof
  • Lithium ion battery organic positive electrode material and application thereof
  • Lithium ion battery organic positive electrode material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The synthesis of conjugated aromatic fused ring P-1 is shown below

[0054]

[0055] Dissolve 1.6-dibromopyrene in N-methylpyrrolidone (NMP), add anhydrous sodium sulfide, and carry out polycondensation reaction. After the reaction was completed, centrifuged, washed, dried, and Soxhlet extracted and purified to obtain the conjugated aromatic fused ring derivative polythiopyrene P-1 of the material. The polymer was calculated to be 11 through elemental analysis and halogen content determination.

[0056] Mix 30mg of polythiopyrene, 24mg of Super-P and 6mg of polyvinylidene fluoride thoroughly, add 0.5ml of N-methylpyrrolidone, grind again to obtain a homogeneous slurry, evenly coat it on aluminum foil, and then vacuum at 80°C Dry for 12 hours to prepare an electrode film. In a dry argon glove box, use the prepared electrode film as the positive electrode, glass fiber as the separator, 1.0mol / L lithium perchlorate propylene carbonate solution as the electrolyte, and m...

Embodiment 2

[0059] The synthesis of the conjugated aromatic fused ring P-8 is shown below:

[0060]

[0061] Dissolve pyrene diboronic acid ester in a mixed solution of dioxane and water (volume ratio, 1:1), add an equivalent amount of 2,5-dibromothiophene, add a palladium catalyst, and heat up for 24 hours after deoxygenation . After the reaction is completed, the reaction solution is poured into methanol, the precipitate is precipitated, centrifuged, washed, and purified by Soxhlet extraction to obtain the conjugated aromatic fused ring derivative thienylpyrene polymer of the material, and the polymer is between 8- Between 20.

[0062] Mix 30mg of thienylpyrene polymer, 24mg of Super-P and 6mg of polyvinylidene fluoride thoroughly, add 0.5ml of N-methylpyrrolidone, and grind again to obtain a homogeneous slurry, which is evenly coated on aluminum foil, and then at 80 °C for 12 hours in vacuum to prepare an electrode film. In a dry argon glove box, use the prepared electrode film a...

Embodiment 3

[0065] The synthesis of the conjugated aromatic fused ring P-14 is shown below:

[0066]

[0067] Dissolve pyrene diboronic acid ester in the mixed solution of dioxane and water (volume ratio, 1:1), add equivalent 3,7-dibromo-N methylphenothiazine, add palladium catalyst, remove Oxygen post-heating reaction for 24 hours. After the reaction is completed, the reaction solution is poured into methanol, the precipitate is precipitated, centrifuged, washed, and purified by Soxhlet extraction to obtain the conjugated aromatic condensed ring derivative phenothiazine pyrene polymer, the polymer of which is between 8 Between -20.

[0068] Mix 30mg of phenothiazine pyrene polymer, 24mg of Super-P and 6mg of polyvinylidene fluoride thoroughly, add 0.5ml of N-methylpyrrolidone, and grind again to obtain a homogeneous slurry, which is evenly coated on aluminum foil, and then placed on Vacuum drying at 80°C for 12 hours to prepare an electrode film. In a dry argon glove box, use the p...

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Abstract

The invention belongs to the field of preparation of positive electrode materials for lithium ion batteries, and more particularly to a lithium ion battery organic positive electrode material, a preparation method thereof and application. The material is a polymer formed by copolymerization of pyrene or a pyrene derivative as a comonomer. The organic positive electrode material uses a conjugated aromatic fused ring of pyrene as an electrochemical redox site, and due to an anion insertion mechanism based on the conjugated aromatic fused ring, the potential of the redox electrode is increased, the output voltage of the lithium ion battery is increased, and the energy density of the positive electrode material is thus improved. The lithium ion battery made of the material provided in the invention has high energy density, good cycle stability and rate performance, and is expected to be used in the next generation of high energy density, environment friendly and sustainable energy storagebatteries.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion cathode materials, and more specifically relates to an organic cathode material for lithium ion batteries, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices due to their high energy density and power density. In recent years, with the further deepening of research technology and the expansion of application fields, there is a huge demand for lithium-ion batteries in the field of electric vehicles and even large-scale energy storage. [0003] How to further improve the performance of lithium-ion batteries is a research hotspot in the field of energy storage. The quality of the positive electrode material of lithium-ion battery determines the level of battery capacity. Traditional lithium-ion battery cathode materials are lithium-containing inorganic metal oxides or phosphates, etc., whose price...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/137H01M10/0525
CPCH01M4/1399H01M4/608H01M10/0525H01M2004/028Y02E60/10
Inventor 王成亮唐蜜刘视远吴艳超陈远姜澄
Owner HUAZHONG UNIV OF SCI & TECH
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