Preparation method and application of coralline-shaped layered porous carbon in lithium sulfur battery

A coral-like and porous carbon technology is applied in the preparation of coral-like lamellar porous carbon and in the application field of lithium-sulfur batteries, which can solve the problems of easy cracking and powder removal of pole pieces, reducing sulfur content, and low tap density. The effect of improving electrochemical performance, improving electrical conductivity, excellent electrical conductivity

Active Publication Date: 2019-10-18
NAT UNIV OF DEFENSE TECH
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  • Description
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Problems solved by technology

However, commercial nano-carbon particles are nanoscale (10-200nm) and have low tap density. The nano-sulfur positive electrode obtained after compounding with sulfur has poor manufacturability during the preparation of battery pole pieces, and the pole pieces are easily cracked when coated thick. Disadvantages such as falling powder, and more binders are required, which reduces the content of sulfur in the pole piece

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  • Preparation method and application of coralline-shaped layered porous carbon in lithium sulfur battery
  • Preparation method and application of coralline-shaped layered porous carbon in lithium sulfur battery
  • Preparation method and application of coralline-shaped layered porous carbon in lithium sulfur battery

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preparation example Construction

[0025] The present invention also proposes a method for preparing a coral-like sheet-layer porous carbon material, comprising the following steps:

[0026] (1) Preparing the precursor solution: adding nickel nitrate, zinc acetate and urea into the mixed solution of water and ethylene glycol, stirring and dissolving, then adding resorcinol and formaldehyde solution in sequence, and stirring evenly to obtain the precursor solution.

[0027] Preferably, the mol ratio of nickel nitrate and zinc acetate is 1:(0.5~2); The mol ratio of described nickel nitrate and urea is 1:(0.5~4), and suitable ratio relation is beneficial to double metal hydroxide The formation of the template and the regulation and control of the template morphology; the volume ratio of the water to ethylene glycol is 1: (2-10), so that the nickel nitrate, zinc acetate and urea are fully dissolved and uniformly dispersed; the resorcinol The molar ratio to formaldehyde is 1:(1~2), which is conducive to the occurren...

Embodiment 1

[0038] This embodiment provides a coral-like sheet-layer porous carbon, the coral-like sheet-layer porous carbon is a micro-nano hierarchical porous structure, which is formed by the aggregation of coral branch-like sheet-layer porous carbon; the thickness of the sheet-layer porous carbon is 50 ~200nm, the size is 1~5μm.

[0039] This embodiment also provides a preparation method of coral-like sheet porous carbon, comprising the following steps:

[0040] (1) Add 4.8g of nickel nitrate, 4.5g of zinc acetate and 2.4g of urea into a mixed solution of 80ml of water and 560ml of ethylene glycol to dissolve, then add 2.4g of resorcinol and 3.2g of formaldehyde solution in turn, and stir for 1.5h After obtaining the precursor solution;

[0041] (2) Seal the precursor solution in a hydrothermal kettle at 160°C for 12 hours, filter and wash after cooling, and dry at 100°C for 6 hours to obtain the precursor powder;

[0042] (3) Precursor powder in Ar / 20%H 2 Under the atmosphere, the...

Embodiment 2

[0052] This embodiment provides a coral-like sheet-layer porous carbon, which is a micro-nano hierarchical porous structure material; the thickness of the sheet-layer porous carbon is 50-200 nm, and the size is 1-2 μm.

[0053] This embodiment also provides a preparation method of coral-like sheet porous carbon, comprising the following steps:

[0054] (1) Add 4.8g of nickel nitrate, 2.4g of zinc acetate and 2.4g of urea into a mixed solution of 80ml of water and 560ml of ethylene glycol to dissolve, then add 2.4g of resorcinol and 3.2g of formaldehyde solution in turn, and stir for 0.5h After obtaining the precursor solution;

[0055] (2) Seal the precursor solution in a hydrothermal kettle at 200°C for 6 hours, filter and wash after cooling, and dry at 100°C for 5 hours to obtain the precursor powder;

[0056] (3) Precursor powder in Ar / 5%H 2 Raise the temperature to 1000°C for 10 hours under the atmosphere, and cool naturally to obtain black sintered powder;

[0057] (4)...

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Abstract

The invention discloses a preparation method and application of coralline-shaped layered porous carbon in a lithium sulfur battery. The coralline-shaped layered porous carbon is of a micro-nano gradedporous structure which is prepared from coralline branch shaped layered porous carbon through aggregation, the thickness of the layered porous carbon is 50-200nm, and the size is 1-5[mu] m. The preparation method of the coralline-shaped layered porous carbon comprises the following four steps: preparing a precursor solution, forming a double-hydroxide mold plate and a layered polymer, performinghigh-temperature carbonization, and removing the mold plate. The preparation method of the coralline-shaped layered porous carbon, which is disclosed by the invention, is simple and convenient and good in effect, and the prepared coralline-shaped layered porous carbon has good conductivity, meanwhile is rich in micro-nano graded porous structure, is capable of accommodating more sulfur, improvingelectrochemical properties of a sulfur anode, preparing a sulfur anode with a high carrying capacity when being applied to the anode of a lithium sulfur battery and remarkably increasing the energy density of the lithium sulfur battery, and has wide application prospects in lithium sulfur batteries.

Description

technical field [0001] The invention relates to the technical field of micro-nano carbon materials and their preparation, in particular to a preparation method of coral-like lamellar porous carbon and its application in lithium-sulfur batteries. Background technique [0002] Commercial nano-carbon particles such as carbon black, superconducting carbon SP, acetylene black, etc. have excellent conductivity and large specific surface area, and are often used as conductive agents for positive and negative electrode materials in batteries, and can also be used as sulfur in lithium-sulfur batteries. carrier. However, commercial nano-carbon particles are nanoscale (10-200nm) and have low tap density. The nano-sulfur positive electrode obtained after compounding with sulfur has poor manufacturability during the preparation of battery pole pieces, and the pole pieces are easily cracked when coated thick. Disadvantages such as falling powder, and more binders are required, which redu...

Claims

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Application Information

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IPC IPC(8): C01B32/15H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B32/15H01M4/366H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 刘双科洪晓斌王丹琴唐彪郑春满
Owner NAT UNIV OF DEFENSE TECH
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