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Lithium-loaded composite framework material as well as preparation method and application thereof

A framework material and lithium analysis technology, applied in the field of lithium-loaded composite framework materials and their preparation, can solve the problems of large volume effect, interface side reactions, etc., and achieve the effects of uniform deposition, reduced contact, and good gradient lithium-philic properties

Pending Publication Date: 2022-03-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of serious interfacial side reactions and large volume effect in the existing lithium metal negative electrode during the cycle process, the present invention provides a lithium-loaded composite framework material, which aims to selectively induce lithium to be uniformly deposited in the inner cavity of the carbon composite framework , improve the unevenness of lithium deposition under high current, reduce the volume effect and interface side reactions, and improve the cycle performance of lithium metal anode

Method used

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  • Lithium-loaded composite framework material as well as preparation method and application thereof
  • Lithium-loaded composite framework material as well as preparation method and application thereof
  • Lithium-loaded composite framework material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0073] SiO with an average diameter of 500 nm 2 The ball is configured into a 10g / L sol, using a tin protochloride solution with a concentration of 0.05mol / L, SiO 2 The volume ratio of the sol to the stannous chloride solution is 1:2, activate at room temperature for 3 hours, filter with suction, rinse with deionized water and disperse in 100ml of deionized water, add 100ml of 0.025mol / L AgNO 3 Solution, add ammonia solution dropwise to prepare silver ammonia solution, then add 125ml 0.01mol / L glucose solution dropwise and stir in water bath at 50°C for 2h to prepare SiO 2 @Ag. SiO 2 After cleaning @Ag, disperse in 50ml water, add 0.25g dopamine, 0.25g trishydroxyaminomethane, pH is 8.5, stir at room temperature for 24h to obtain the SiO 2 @Ag@Carbon Source; After filtration and cleaning, it is mixed with water to form a suspension with a solid-to-liquid ratio of 40%, and the spray temperature is set to 200°C to prepare secondary particles stacked with hollow thin-walled na...

Embodiment 2

[0092] SiO with an average diameter of 500 nm 2 The ball is configured into a 10g / L sol, using a tin protochloride solution with a concentration of 0.05mol / L, SiO 2 The volume ratio of the sol to the stannous chloride solution is 1:2, activate at room temperature for 3 hours, filter with suction, rinse with deionized water and disperse in 100ml of deionized water, add the activated template to a concentration of 0.1mol / L Zn(NO 3 ) 2 , then add polyethylene glycol solution, then add 0.0001mol / L KOH solution, stir for 2h to obtain ZnO nanoparticles, add 0.5g dopamine, 0.5g trishydroxyaminomethane, pH is 8.5, stir at room temperature for 24h to obtain the SiO 2@ZnO@Carbon Source; After filtering and cleaning, it is mixed with water to make a suspension with a solid-to-liquid ratio of 40%, and the spray temperature is set to 200°C to prepare secondary particles stacked with hollow thin-walled carbon nanospheres. The secondary particles were cleaned and a suspension of 10 g / L wa...

Embodiment 3

[0103] SiO with an average diameter of 500 nm 2 The ball is configured into a 10g / L sol, using a tin protochloride solution with a concentration of 0.05mol / L, SiO 2 The volume ratio of the sol to the stannous chloride solution is 1:2, activate at room temperature for 3 hours, filter with suction, rinse with deionized water and disperse in 100ml of deionized water, add the activated template to a concentration of 0.1mol / L Cu(NO 3 ) 2 , then add aqueous solution, then add formaldehyde solution, stir for 2h to obtain SiO 2 @Cu, in H 2 / N 2 SiO was obtained by plasma at 450°C for 2h in a mixed atmosphere 2 @Cu x N, add 0.5g dopamine, 0.5g trishydroxyaminomethane, pH is 8.5, stir at room temperature for 24h to obtain the SiO 2 @Cu x N@carbon source; after filtering and cleaning, prepare a suspension with a solid-to-liquid ratio of 40% with water, and set the spray temperature to 200°C to prepare secondary particles stacked with hollow thin-walled carbon nanospheres. The se...

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Abstract

The invention discloses a lithium-loaded composite framework material and a preparation method and application thereof.The lithium-loaded composite framework material is of a thin film packaging structure internally packaged with a plurality of hollow thin-wall carbon nanospheres, low-lithium-precipitation overpotential nano particles are compounded on the inner walls of the hollow thin-wall carbon nanospheres, a thin film is a high-lithium-precipitation overpotential film layer, and the hollow thin-wall carbon nanospheres are arranged on the inner walls of the hollow thin-wall carbon nanospheres. The film layer is a single layer or a plurality of layers and is selected from a carbon layer, a polymer film layer, a solid electrolyte film layer, an oxide film layer or an ion / electron mixed conductor film layer; the low lithium precipitation overpotential nanoparticles are defined as simple substances or compounds with the reaction potential with lithium being greater than 0V; the high-precipitation lithium overpotential film layer is defined as a film layer in which the electrodeposition potential of lithium on the surface thereof is less than 0V. Compared with a thin film, the inner wall of the lithium-loaded composite framework material has lower lithium precipitation potential, so that lithium ions can only penetrate through the carbon wall and are preferentially nucleated and deposited in the hollow carbon sphere, and packaging and continuous and uniform deposition / dissolution of lithium metal are realized.

Description

technical field [0001] The invention belongs to the technical field of lithium metal battery electrode materials, and in particular relates to a lithium-carrying composite skeleton material and a preparation method and application thereof. Background technique [0002] The negative electrode of a lithium metal battery is usually a metal lithium element or an electrode containing a metal lithium element, which is different from a conventional lithium ion battery. The discharge mechanism is: Charge: Li + +e=Li; discharge: Li-e=Li + . Therefore, compared with lithium-ion batteries, lithium metal batteries are a new battery system with a different mechanism of action. [0003] Lithium metal has a very high theoretical specific capacity of 3860mAh g -1 , the lowest electrochemical potential -3.04V (relative to the standard hydrogen electrode), has been considered as the most potential anode material for the next generation of high-energy secondary battery system. However, li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/60H01M4/62H01M10/052
CPCH01M4/366H01M4/583H01M4/602H01M4/483H01M4/625H01M10/052H01M2004/027Y02E60/10
Inventor 赖延清洪波姜怀赖俊全李劼周言根张治安张凯覃富荣
Owner CENT SOUTH UNIV
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