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Metal selenium sulfide nanocrystalline-porous carbon sphere material as well as preparation and application thereof in lithium metal battery

A technology of porous carbon and sulfide, applied in the direction of lithium batteries, battery electrodes, active material electrodes, etc., can solve the problems of poor electrical performance and cycle performance, achieve excellent performance, improve capacity and cycle performance, and solve the problem of uneven lithium deposition Effect

Active Publication Date: 2021-03-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of uneven deposition of lithium metal and poor electrical performance, especially the cycle performance of existing lithium metal anode materials during the cycle process, the present invention provides a metal selenium sulfide nanocrystal@porous carbon sphere material, which aims to selectively induce lithium uniformity Deposition, improve the uniformity of lithium deposition under high current, reduce volume effect and interface side reactions, and improve the cycle performance of lithium metal negative electrodes

Method used

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  • Metal selenium sulfide nanocrystalline-porous carbon sphere material as well as preparation and application thereof in lithium metal battery
  • Metal selenium sulfide nanocrystalline-porous carbon sphere material as well as preparation and application thereof in lithium metal battery
  • Metal selenium sulfide nanocrystalline-porous carbon sphere material as well as preparation and application thereof in lithium metal battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 0.12g porous carbon spheres (specific surface area 100m 2 / g, the carbon wall thickness is 5nm, and the internal cavity volume accounts for 90% of the total volume), 2.38g magnesium selenide powder, 50mL deionized water are mixed and then added in the hydrothermal reaction kettle, kept at 180 ℃ for 80 hours, and the The material was cleaned, filtered, and dried to obtain magnesium selenide@porous carbon spheres, and then the elemental sulfur was used as the sulfur source (the dosage was 3.2g), and sulfuration and doping were carried out in a dual-temperature zone tube furnace. The temperature of the sulfur source was 200°C. The temperature of the sample area (the temperature of the magnesium selenide@porous carbon sphere area, that is, the vulcanization temperature) is 250°C, the heating rate is 3°C / min, the holding time is 30min, and the cooling rate is 5°C / min, the obtained is the loaded selenium vulcanization Magnesium nanoparticles (MgS 0.16 Se 0.84 ) porous carbo...

Embodiment 2

[0072] Full battery case:

[0073] 0.3 porous carbon spheres (specific surface area 150m 2 / g, the carbon wall thickness is 25nm, and the internal cavity volume accounts for 78% of the total volume), 0.81g zinc selenide powder, 60mL deionized water are mixed and then added in the hydrothermal reactor, kept at 160°C for 75 hours, and the This material is cleaned, filtered, and dried to obtain zinc selenide@porous carbon spheres. Elemental sulfur is used as the sulfur source. Sulfur doping is carried out in a dual-temperature zone tube furnace. The temperature is 200°C, the heating rate is 1°C / min, the holding time is 550min, and the cooling rate is 3°C / min. 0.81 Se 0.19 ) porous carbon sphere material (ZnS 0.81 Se 0.19 @ porous carbon spheres). Then it is mixed with polyvinylidene fluoride at a mass ratio of 9:1, slurried with NMP, and coated on copper foil (10 μm in thickness), with a coating thickness of 20 μm. Then deposit 50mAh / cm into the hollow carbon sphere chamber...

Embodiment 3

[0075] 0.3g porous carbon spheres (specific surface area 146m 2 / g, the thickness of the carbon wall is 12nm, and the volume of the internal cavity accounts for 81% of the total volume), 2.77g of indium selenide powder, 55mL of deionized water are mixed and then added to the hydrothermal reaction kettle, kept at 170°C for 72 hours, and the The material was cleaned, filtered, and dried, and sulfur-doped in a dual-temperature zone tube furnace. The temperature of the sulfur source was 250°C, the temperature of the sample area was 200°C, the heating rate was 3°C / min, the holding time was 450min, and the cooling rate was 6°C. / min, the resulting loaded selenium sulfide nanoparticles (In 2 (S 0.74 Se 0.26 ) 3 ) of porous carbon spheres. Then it is mixed with polyvinylidene fluoride at a mass ratio of 9:1, slurried with NMP, and coated on copper foil (10 μm in thickness), with a coating thickness of 50 μm. Then deposit 50mAh / cm into the porous carbon sphere chamber by electroch...

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Abstract

The invention belongs to the technical field of lithium metal battery materials, and particularly relates to a metal selenium sulfide nanocrystalline-porous carbon sphere material. The material comprises a porous carbon sphere with a filling chamber, and metal selenium sulfide nanocrystalline loaded on the carbon wall of the porous carbon sphere and in the filling chamber; the chemical formula ofthe metal selenium sulfide nanocrystal is at least one of M'(SexS(1-x)) and M''2(SeyS(1-y))3, M' is zinc and / or magnesium; M'' is aluminum and / or indium, 0<x<1, and 0<y<1. The invention also comprisespreparation of the material, and a composite current collector, a negative electrode and a lithium metal battery which are prepared from the material. According to the invention, the metal selenium sulfide nanocrystalline is innovatively utilized to induce selective deposition of lithium metal, so that the first-circle efficiency and the cycling stability of the lithium metal battery can be improved.

Description

technical field [0001] The invention relates to the field of lithium metal battery electrode materials, in particular to a lithium metal battery negative electrode material. Background technique [0002] The negative electrode of a lithium metal battery is usually a single substance of lithium metal. The mechanism of action in the battery is the deposition and dissolution of lithium metal. The charging and discharging mechanism is: charging: Li + +e=Li; discharge: Li-e=Li + ; What is different from the negative electrode of the conventional lithium ion battery is the intercalation and extraction of lithium ions in the graphite negative electrode. Lithium metal batteries and lithium ion batteries are new battery systems with different mechanisms. [0003] Metal lithium anode is known as the "Holy Grail" anode material in secondary batteries due to its extremely high capacity and relatively negative electrochemical potential. Batteries with metal lithium as the anode are pro...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M4/64H01M4/136H01M10/052
CPCH01M4/362H01M4/583H01M4/581H01M4/622H01M4/136H01M4/64H01M10/052H01M2004/027Y02E60/10
Inventor 洪波赖延清高春晖姜怀张治安张凯
Owner CENT SOUTH UNIV
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