Lithium sulfide/carbon composite material with multilevel structure as well as preparation method and application of lithium sulfide/carbon composite material

A carbon composite material and lithium sulfide technology, which is applied in the field of material science, can solve the problems of carbon/lithium sulfide composite material with general, unsatisfactory structural stability, and does not effectively solve the problems of lithium sulfide active material dispersion, etc., and achieves excellent cycle specific capacity and The effect of capacity retention, alleviation of volume expansion and contraction, and improvement of electrical conductivity

Pending Publication Date: 2022-05-13
CHINA AUTOMOTIVE INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] None of the above literatures has effectively solved the problem of unsatisfactory dispersion of lithium sulfide active materials in composite materials and the general structural stability of carbon / lithium sulfide composite materials.

Method used

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  • Lithium sulfide/carbon composite material with multilevel structure as well as preparation method and application of lithium sulfide/carbon composite material
  • Lithium sulfide/carbon composite material with multilevel structure as well as preparation method and application of lithium sulfide/carbon composite material
  • Lithium sulfide/carbon composite material with multilevel structure as well as preparation method and application of lithium sulfide/carbon composite material

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Effect test

Embodiment 1

[0058] The present embodiment provides a kind of preparation method of multi-level structure lithium sulfide / carbon composite material, such as figure 1 Shown, described preparation method comprises:

[0059] (1) 2.5g of Co(NO 3 ) 2 ·6H 2 O is dissolved in 50mL deionized water to obtain a cobalt salt solution with a concentration of 5wt%, adding 0.1g of lithium sulfate to dissolve in the cobalt salt solution, and then adding 50mL of a graphene oxide solution with a concentration of 10mg / mL to obtain a mixed solution;

[0060] (2) Stir the mixed solution obtained in step (1) for 12h at a speed of 500rpm / min, then perform ultrasonic dispersion for 30min, then centrifuge at a speed of 8000rpm / min for 5min to obtain a precipitate, and then place the precipitate Pretreatment in liquid nitrogen for 10 minutes, vacuum freeze-drying for 12 hours to obtain the precursor material;

[0061] (3) Place the melamine powder and the precursor material obtained in step (2) on both ends of ...

Embodiment 2

[0063] The present embodiment provides a kind of preparation method of multi-level structure lithium sulfide / carbon composite material, such as figure 1 Shown, described preparation method comprises:

[0064] (1) 2.5g of Fe(NO 3 ) 2 9H 2 O is dissolved in 50mL deionized water to obtain a concentration of 5wt% iron salt solution, adding 0.1g lithium sulfate is dissolved in the iron salt solution, and then adding 50mL concentration of graphene oxide solution of 10mg / mL to obtain a mixed solution;

[0065] (2) Stir the mixed solution obtained in step (1) for 12h at a speed of 500rpm / min, then perform ultrasonic dispersion for 30min, then centrifuge at a speed of 8000rpm / min for 5min to obtain a precipitate, and then place the precipitate Pretreatment in liquid nitrogen for 10 minutes, vacuum freeze-drying for 12 hours to obtain the precursor material;

[0066] (3) Place the urea powder and the precursor material obtained in step (2) at both ends of the porcelain boat at a mas...

Embodiment 3

[0068] The present embodiment provides a kind of preparation method of multi-level structure lithium sulfide / carbon composite material, such as figure 1 Shown, described preparation method comprises:

[0069] (1) Add 2.5g of Ni(NO 3 ) 2 ·6H 2 O is dissolved in 50mL deionized water to obtain a concentration of 5wt% nickel salt solution, add 0.1g lithium sulfate to dissolve in the nickel salt solution, then add 50mL concentration of graphene oxide solution of 10mg / mL to obtain a mixed solution;

[0070] (2) Stir the mixed solution obtained in step (1) for 12h at a speed of 500rpm / min, then perform ultrasonic dispersion for 30min, then centrifuge at a speed of 8000rpm / min for 5min to obtain a precipitate, and then place the precipitate Pretreatment in liquid nitrogen for 10 minutes, vacuum freeze-drying for 12 hours to obtain the precursor material;

[0071] (3) Place the melamine powder and the precursor material obtained in step (2) at both ends of the porcelain boat at a mas...

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Abstract

The invention provides a multilevel structure lithium sulfide / carbon composite material and a preparation method and application thereof.The preparation method comprises the steps that a lithium source, a metal salt solution and a graphene oxide solution are mixed and dried to obtain a precursor material, and the precursor material and organic compound powder are subjected to annealing treatment together to obtain the multilevel structure lithium sulfide / carbon composite material. And carrying out autocatalytic reaction and thermal reduction reaction under the annealing treatment condition to obtain the lithium sulfide / carbon composite material with the multilevel structure. The multilevel structure lithium sulfide / carbon composite material obtained by the preparation method disclosed by the invention can stabilize the structure and improve the conductivity through the composite action of the lithium sulfide, the reduced graphene oxide and the carbon hybrid nanotube, and meanwhile, can effectively relieve the volume change of the lithium sulfide / carbon composite material in the charging and discharging process, so that the performance of the lithium sulfide / carbon composite material is improved. And the material has excellent cyclic specific capacity and capacity retention ratio.

Description

technical field [0001] The invention belongs to the technical field of material science and relates to a lithium sulfide / carbon composite material with a multi-level structure, a preparation method and an application thereof. Background technique [0002] Lithium-sulfur batteries have high theoretical specific energy and abundant raw material resources, and have received extensive attention as a promising new-generation energy device. The existing lithium-sulfur battery cathode materials can be divided into carbon / elemental sulfur composite materials and carbon / lithium sulfide composite materials. Among them, the carbon / elemental sulfur composite materials will have a large volume expansion during the first cycle of charging and discharging, which will destroy the material. The structure itself reduces the utilization rate of active sulfur, thereby affecting the electrochemical performance of the battery; while the structure of the carbon / lithium sulfide composite material w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCH01M4/362H01M4/5815H01M4/583H01M4/625H01M10/052B82Y30/00B82Y40/00H01M2004/028
Inventor 胡康黄祯梁士轩赵高科刘张波
Owner CHINA AUTOMOTIVE INNOVATION CORP
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