Lithium-sulfur battery negative electrode with high-specific-surface mesoporous protective film as well as preparation and application of lithium-sulfur battery negative electrode

A lithium-sulfur battery, high specific surface technology, applied in the direction of battery electrodes, lithium batteries, negative electrodes, etc., can solve the problems of unsafe metal lithium anode, limit the application of metal lithium, and increase the irreversible capacity, so as to reduce the lithium current density, It is beneficial to industrial application and inhibits the effect of shuttle effect

Inactive Publication Date: 2021-08-20
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The irreversible capacity increases and the cycle performance decreases. In severe cases, the dendrites will pierce the diaphragm and contact the positive electrode, resulting in an internal short circuit, and even safety accidents such as fire or explosion.
This problem severely limits the application of lithium metal as an anode material for secondary batteries.
The unsafe factors of metallic lithium anode are also a major problem facing the research institute at present.

Method used

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  • Lithium-sulfur battery negative electrode with high-specific-surface mesoporous protective film as well as preparation and application of lithium-sulfur battery negative electrode
  • Lithium-sulfur battery negative electrode with high-specific-surface mesoporous protective film as well as preparation and application of lithium-sulfur battery negative electrode
  • Lithium-sulfur battery negative electrode with high-specific-surface mesoporous protective film as well as preparation and application of lithium-sulfur battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the polar complex is as follows:

[0034]The transition metal potassium cyanide is dissolved in water to obtain a mixed solution A, the concentration of the A solution is 1 wt%, and the transition metal is Fe; the transition metal chloride and the tubular conductive carbon material are added to water and mixed uniformly to obtain a mixed solution B, the described The concentration of solution B is 0.8wt%, and the mass ratio of conductive carbon material to transition metal chloride is 4:1; solution A is slowly dropped into solution B, heated in a water bath at 60°C for 3 hours to obtain solution C, and solution C is avoided Centrifuge after light treatment for 8 hours, wash with water and ethanol several times to obtain powder D; use different carbon sources to treat powder D with carbon coating, and then in N 2 Calcined at 400°C for 2 hours in the atmosphere to obtain egg yolk-shell polar complex E. The carbon source is sucrose; the mass rati...

Embodiment 2

[0038] The preparation method of the polar complex is as follows:

[0039] The transition metal potassium cyanide is dissolved in water to obtain a mixed solution A, the concentration of the A solution is 5 wt%, and the transition metal is Co; the transition metal chloride and the lamellar conductive carbon material are added to water and mixed uniformly to obtain a mixed solution B, The concentration of the solution B is 1.2wt%, and the mass ratio of the conductive carbon material to the transition metal chloride is 1:4; the solution A is slowly dropped into the solution B, and heated in a water bath at 70° C. for 5 hours to obtain the solution C, and the solution C After 24 hours of dark treatment, it was centrifuged, washed with water and ethanol several times to obtain powder D; powder D was treated with carbon coating with different carbon sources, and then calcined at 800°C for 5 hours in an Ar atmosphere to obtain egg yolk-shell polar complex E. The carbon source is glu...

Embodiment 3

[0043] The preparation method of the polar complex is as follows: the transition metal potassium cyanide is dissolved in water to obtain a mixed solution A, the concentration of the A solution is 1wt%, and the transition metal is Ni; the transition metal chloride and the lamellar conductive carbon material are added Mix uniformly in water to obtain a mixed solution B, the concentration of the solution B is 1.2wt%, and the mass ratio of the conductive carbon material to the transition metal chloride is 1:4; the solution A is slowly dropped into the solution B, and heated in a water bath at 70°C After 5 hours, solution C was obtained, and solution C was treated in the dark for 24 hours, then centrifuged, washed with water and ethanol several times to obtain powder D; powder D was treated with carbon coating by using different carbon sources, and then calcined at 800 ° C for 5 hours in an Ar atmosphere to obtain Yolk-shell polar complex E. The carbon source is phenolic resin; the...

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PUM

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Abstract

The invention discloses a lithium-sulfur battery negative electrode with a high-specific-surface mesoporous protective film as well as preparation and application of the lithium-sulfur battery negative electrode. The lithium-sulfur battery negative electrode comprises a matrix made of a metal lithium or lithium alloy material, and a protective layer coated on the surface of the matrix and formed by copper powder and a polar compound. The mass ratio of the protective layer to the lithium sheet is (5: 95)-(50: 50); the pore volume of the polar compound is 0.5-5.0 cm<3>/g, and the specific surface area is 300-2000 m<2>/g; the particle size of particles in the protective layer is 10 nm-5 mum, the thickness of the protective layer is 10-200 mum, and the internal porous structure of the lithium-sulfur battery negative electrode prepared by the invention effectively relieves the volume expansion effect of the negative electrode.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium-sulfur battery negative electrode with a high specific surface mesoporous protective film and its preparation and application. Background technique [0002] With the development of science and technology, human beings' demand for energy consumption is increasing day by day. Under the background of increasingly tense energy sources, all countries in the world are focusing on the research of green and environmentally friendly new energy sources. How to make the existing energy not only satisfy the current social and economic development but also be environmentally friendly has become a global issue. At the same time, people's requirements for electronic products are miniaturization and portability. Metal lithium secondary batteries also have high specific energy due to their high power. At the same time, this type of battery has no harmful metal elements and is a green ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/62H01M4/1395H01M10/052
CPCH01M4/134H01M4/628H01M4/625H01M4/1395H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 王美日辛莎莎刘桃李婧崔洪涛刘媛媛
Owner YANTAI UNIV
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