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Method for improving performance of COFs (Covalent Organic Frameworks) material used as electrode active material

An electrode active material and performance technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor rate performance and low capacity utilization.

Inactive Publication Date: 2017-09-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] Aiming at the problems of low capacity utilization and poor rate performance when COFs materials are currently used as electrode active materials for lithium batteries, the purpose of the present invention is to provide a method for improving the performance of COFs materials as electrode active materials. The method is simple to operate, and the raw materials Low cost and large-scale processability, the prepared COFs thin-layer material can greatly improve its performance as an electrode active material for lithium-ion batteries

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  • Method for improving performance of COFs (Covalent Organic Frameworks) material used as electrode active material
  • Method for improving performance of COFs (Covalent Organic Frameworks) material used as electrode active material

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Embodiment 1

[0064] A method for improving the performance of COFs material as an electrode active material, the steps of the method are as follows:

[0065] (1) Add 34mg of DAAQ (0.142mmol), 20mg of TFP (0.95mmol) and mesitylene and N,N-dimethylacetamide with a volume ratio of 1:3 mixed solvent 2mL into a 10mL ampoule In the process, oxygen was removed by liquid nitrogen freezing and thawing pump circulation method, and the mouth of the ampoule bottle was calcined, melted, sealed and sealed with a flame gun, and placed in an oven at 120°C for 3 days. After cooling to room temperature, the obtained material was centrifuged to obtain a solid. The solid was washed with acetone after DMF, and dried under vacuum at 120° C. to obtain a deep red powdery material, which was a COFs material composed of DAAQ and TFP (hereinafter referred to as DAAQ-TFP-COFs material), with a yield of 73%.

[0066] (2) Put 150 mg of DAAQ-TFP-COFs material into a ball milling jar with a volume of 5 mL, add 4 steel ba...

Embodiment 2

[0089] (1) Mix 30mg of 2,5-diamino-1,4-dihydroxybenzene (DABH) (0.142mmol), 20mg of TFP (0.95mmol) with mesitylene and N,N-dimethylacetamide Add 1.2mL of mixed solvent with a volume ratio of 1:1 into a 10mL ampoule bottle, deoxygenate through the liquid nitrogen freezing and thawing pump circulation method, use a flame gun to calcinate, melt, seal and seal the ampoule bottle mouth, and place it in an oven at 100°C After reaction 3d, after cooling to room temperature, the obtained material was centrifuged to obtain a solid, which was first washed with DMF and then tetrahydrofuran, and dried in vacuum at 120°C to obtain a black powder material, which was a COFs material composed of DABH and TFP (hereinafter Referred to as DABH-TFP-COFs material), the yield was 87%.

[0090] In order to oxidize DABH-TFP-COFs into DABQ-TFP-COFs with redox active sites, 50 mg of DABH-TFP-COFs were dissolved in 5 mL of triethylamine, and then the suspension was air- Stir in the atmosphere for 12 ho...

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Abstract

The invention relates to a method for improving performance of a COFs (Covalent Organic Frameworks) material used as an electrode active material. The method belongs to the technical field of lithium batteries and comprises the step of using dry ball milling to strip the COFs material with a redox reactivity site into an ECOFs material with a thin-film nanoscale lamellar structure. The COFs material prepared through utilizing ball milling and stripping is used as the electrode active material of a lithium ion battery, so that compared with the COFs material used as the electrode active material of the lithium ion battery, the utilization ratio of the redox site can be remarkably improved, and the volume is remarkably improved; a lithium ion passing path is shortened, and a rate capability is remarkably improved; meanwhile, dynamics leading reaction is transformed into charge transfer control from diffusion control, so that the reaction dynamics is greatly improved; the cycle stability performance of the lithium battery is improved.

Description

technical field [0001] The invention relates to a method for improving the performance of COFs materials as electrode active materials, in particular to a method for ball milling to peel off two-dimensional layered covalent organic frameworks (COFs) materials with redox active sites, in order to peel off The performance of the obtained COFs thin-layer material as an electrode active material is greatly improved, and belongs to the technical field of lithium batteries. Background technique [0002] At present, the cathode materials widely used in lithium-ion batteries are lithium transition metal oxides, including LiCoO 2 , LiNiO 2 , LiMn 2 o 4 and LiFePO 4 , they have the following disadvantages: 1. The capacity utilization rate is low, and the space for capacity improvement is very limited; 2. They all use non-renewable mineral deposits as raw materials; 3. Traditional inorganic cathode materials still have hidden dangers in terms of safety. The main reason is that when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M10/0525
CPCH01M4/60H01M10/0525Y02E60/10
Inventor 冯霄王博王珊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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