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Preparation method of three-dimensional porous metal lithium anode

A three-dimensional porous, metal lithium technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problem of high volume effect of lithium metal anode, achieve simple operation and alleviate the effect of huge volume expansion

Active Publication Date: 2021-09-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a three-dimensional porous metal lithium anode, which aims to solve the problem of high volume effect in the charging and discharging process of the existing lithium metal anode

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  • Preparation method of three-dimensional porous metal lithium anode

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Experimental program
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Effect test

Embodiment 1

[0023] Material preparation: get 0.24g porous carbon material (pore diameter 80nm, wall thickness 5nm, specific surface area 285cm 3 / g, pore volume 78%), add 100mL copper nitrate water / ethanol (volume ratio 1:1) solution with a concentration of 0.1M, stir at 30°C for 3 hours, wash, filter and dry, then add the material In a copper nitrate solution with a concentration of 1M, stir for 1 hour, wash, filter, and dry to obtain a black material. Put the black material in a tube furnace, adopt an argon atmosphere, the gas flow rate is 20sccm, the heating rate is 5°C / min, the heat treatment temperature is 200°C, the holding time is 2h, and the cooling rate is 5°C / min. The porous carbon material is cleaned, filtered and dried, and the obtained solid material is the porous carbon material loaded with metal oxide nanoparticles.

[0024] Electrochemical properties: The porous carbon material supported by metal oxide nanoparticles is used as the active material coating, and the thicknes...

Embodiment 2

[0035] Material preparation: take 0.24g porous carbon material (pore diameter 150nm, wall thickness 7nm, specific surface area 625cm 3 / g, pore volume 95%), add 100mL concentration and be in the nickel nitrate aqueous solution of 0.01M, stir 4 hours at 50 ℃, after cleaning, filtering, drying, the material is added in the nickel nitrate aqueous solution that concentration is 0.1M, stir After 2 hours, after washing, filtering and drying, the material was added into a nickel nitrate aqueous solution with a concentration of 1M, stirred for 1 hour, washed, filtered and dried to obtain a black material. Put the black material in a tube furnace with an argon atmosphere, the gas flow rate is 40sccm, the heating rate is 10°C / min, the heat treatment temperature is 300°C, the holding time is 4h, and the cooling rate is 3°C / min. The porous carbon material is cleaned, filtered and dried, and the obtained solid material is the porous carbon material loaded with metal oxide nanoparticles.

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Embodiment 3

[0038] Material preparation: take 0.24g porous carbon material (pore diameter 200nm, wall thickness 10nm, specific surface area 518cm 3 / g, pore volume 90%), add the copper acetate water / ethanol (volume ratio 1:1) solution that concentration is 0.05M, stir at 25 ℃ for 3 hours, after washing, filtering and drying, the concentration of adding materials is 0.5M copper acetate water / ethanol (volume ratio 2:1) solution, stirred at room temperature for 2 hours, washed, filtered, and dried, then added the material to a 2M copper acetate aqueous solution, stirred at room temperature for 1 hours, washed, filtered, and dried to obtain a black material. Put the black material in a tube furnace with an argon atmosphere, the gas flow rate is 80sccm, the heating rate is 1°C / min, the heat treatment temperature is 200°C, the holding time is 4h, and the cooling rate is 1°C / min. The porous carbon material is cleaned, filtered and dried, and the obtained solid material is the porous carbon mate...

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Abstract

The invention discloses a preparation method of a three-dimensional porous metal lithium anode. The method comprises: dissolving a porous carbon material in a metal salt solution to obtain a mixed solution, and after the mixed solution is stirred, it is washed, filtered and dried in sequence to obtain a black material; After the black material is heat-treated in an inert atmosphere, it is washed, filtered and dried in sequence to obtain a porous carbon material loaded with metal oxide nanoparticles; the porous carbon material loaded with metal oxide nanoparticles is used as an active material for smearing to obtain a very sheet; by cold rolling or electrodeposition, lithium is intercalated on the pole sheet to obtain a metal lithium anode. The preparation method of the nanocrystalline particle-supported lithium metal active material provided by the present invention is simple to operate and is suitable for large-scale industrial production. The obtained three-dimensional porous metal lithium anode can not only alleviate the huge volume expansion in the charging and discharging process, but also can Solve the problem that the conductive skeleton is easy to block the holes.

Description

technical field [0001] The invention relates to the field of energy storage materials and nanotechnology, in particular to a method for preparing a three-dimensional porous metal lithium anode. Background technique [0002] Lithium-ion batteries have developed rapidly in the past 30 years, and are widely used in mobile phones, digital cameras, electric vehicles, etc. However, with the improvement of people's needs, the requirements for the energy density of lithium-ion batteries are getting higher and higher. The anode is close to its theoretical limit. In order to achieve an energy density of 350Wh / kg or higher, it is currently a hot spot for researchers to seek positive and negative materials with higher energy density. With its ultra-high specific energy, ultra-low electrochemical potential and low density, lithium metal anode is known as the "holy grail" in anode materials. Lithium ternary batteries, lithium-sulfur batteries, Lithium-oxygen batteries have become a resea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/134
CPCH01M4/134H01M4/1395H01M2004/021H01M2004/027Y02E60/10
Inventor 洪波赖延清高春晖董庆元张凯张治安
Owner CENT SOUTH UNIV