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Preparation method and application of metal single-atom-supported double-doped porosity-controllable MOF-derived graphene/sulfur composites

A composite material and double doping technology, applied in the direction of positive electrode, active material electrode, structural parts, etc., can solve the problems of inability to effectively limit the shuttle of polysulfides, difficulty in preparing porous metal oxides, and reduced battery capacity, and achieve faster The effect of electrode reaction rate, reduced shuttle effect, and high utilization rate

Active Publication Date: 2022-04-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to solve the problem that existing sulfur positive electrode materials prepared with porous carbon materials and porous oxide materials as carrier materials cannot effectively limit the shuttle of polysulfides, resulting in a rapid decrease in battery capacity and difficulty in preparing porous metal oxides, which consumes a lot of energy. The problem of complex material composition and low atom utilization rate, and a preparation method and application of MOF-derived graphene / sulfur composite material with metal single-atom loading and double-doped porosity controllable

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  • Preparation method and application of metal single-atom-supported double-doped porosity-controllable MOF-derived graphene/sulfur composites
  • Preparation method and application of metal single-atom-supported double-doped porosity-controllable MOF-derived graphene/sulfur composites
  • Preparation method and application of metal single-atom-supported double-doped porosity-controllable MOF-derived graphene/sulfur composites

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specific Embodiment approach 1

[0065] Embodiment 1: A method for preparing a MOF-derived graphene / sulfur composite material with double-doped porosity controllable on a metal single atom, specifically according to the following steps:

[0066] 1. Disperse the emulsifier-surfactant into the ethanol solution, then add the metal salt, stir and disperse to obtain a clear reaction solution A;

[0067] 2. Disperse the ligand into the ethanol solution, stir and disperse to form a clear reaction solution B;

[0068] 3. Add the reaction solution B to the reaction solution A, mix evenly, settle at room temperature, then use absolute ethanol to centrifuge and wash for several times, and dry to obtain the MOF precursor;

[0069]4. Pre-calcine the MOF precursor in an inert atmosphere, then soak it in the activator solution, heat and stir to remove the solvent, dry it, put it in a tube furnace, heat it for 10-30min in an inert atmosphere, cool to room temperature, and acid Impregnation and centrifugal drying to obtain a...

specific Embodiment approach 2

[0072] Embodiment 2: This embodiment is different from Embodiment 1 in that: in step 1, the emulsifier-surfactant is polyvinylpyrrolidone, and the metal salt is manganese acetate tetrahydrate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0073] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the volume ratio of absolute ethanol and deionized water in the ethanol solution described in step one is 1:1, emulsifier-surfactant and ethanol solution The mass-to-volume ratio is (3-10) g: 100 mL. Others are the same as in the first or second embodiment.

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Abstract

A preparation method and application of a metal single-atom supported double-doped pore controllable MOF derived graphene / sulfur composite material. The invention relates to the preparation method and application field of a metal single-atom carbon-based composite material. The invention aims to solve the problems of rapid decrease in battery capacity caused by severe lithium polysulfide shuttle effect, difficulty in preparation of porous metal oxide, high energy consumption, complex material composition and low atom utilization rate. Method: first prepare the MOF precursor; then prepare the metal single atom / graphene composite material with controllable pores; then prepare the composite graphene-based material doped with nitrogen and oxygen, and load sulfur. The composite material is used as a cathode material to prepare a lithium-sulfur battery. MOF-derived graphene with metal single atoms and heteroatoms synergistically acting on the pores is used as the S carrier. The method has the advantages of low cost, simple process, low energy consumption and environmental friendliness, and can realize large-scale production. The composite material prepared by the invention is used as a cathode material in the field of lithium-sulfur batteries.

Description

technical field [0001] The invention relates to the preparation method and application field of a metal single-atom carbon-based composite material, in particular to a preparation method and application of a metal single-atom carbon-based composite material suitable for anode carrier materials of lithium-sulfur batteries. Background technique [0002] Li-S batteries with sulfur as the positive electrode have a high theoretical energy density (2500W h kg -1 ) and volumetric energy density (2800W·h·L -1 ), which is 3 to 5 times that of traditional lithium-ion batteries. In addition, sulfur has the advantages of abundant resource reserves, low price, and environmental friendliness. The general reaction equation of Li-S batteries is: S 8 +16Li + +16e - →8Li 2 S, the average voltage is 2.15V corresponding to Li + / Li is 1 / 2~2 / 3 of the anode voltage of the existing intercalated lithium-ion battery, and the theoretical capacity is 1672mA·h·g -1 , is the highest among solid-st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 黄小萧刘亚南卫增岩钟博夏龙
Owner HARBIN INST OF TECH