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Lithium-sulfur battery cathode material, preparation method thereof and lithium-sulfur battery

A technology for lithium-sulfur batteries and positive electrode materials, which is applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., and can solve the problems of poor electrolyte wettability, unsatisfactory cycle performance, and low sulfur loading of pole pieces. Achieve the effects of inhibiting the shuttle effect, improving cycle stability, and good cycle performance

Inactive Publication Date: 2021-01-12
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a lithium-sulfur battery positive electrode material and its preparation method, to solve the problem that the sulfur loading of the existing lithium-sulfur battery positive electrode material is not high, and the electrolyte wettability of the formed pole pieces suboptimal technical issues
[0008] Another object of the present invention is to provide a lithium-sulfur battery positive electrode and a lithium-sulfur battery to solve the technical problems of low capacity and unsatisfactory cycle performance of the existing lithium-sulfur battery due to the existing lithium-sulfur battery positive electrode material

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  • Lithium-sulfur battery cathode material, preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery cathode material, preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery cathode material, preparation method thereof and lithium-sulfur battery

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preparation example Construction

[0036] Correspondingly, based on the anode material of the lithium-sulfur battery described above, the embodiment of the present invention also provides a preparation method of the anode material of the lithium-sulfur battery. The process flow of the preparation method of the lithium-sulfur battery positive electrode material is as follows: figure 1 As shown, it includes the following steps:

[0037] S01: carbon nanotubes and ketjen black are prepared into a mixed carbon dispersion;

[0038] S02: Spray drying the mixed carbon dispersion to obtain composite carbon particles;

[0039] S03: Mixing the composite carbon particles with elemental sulfur, and then performing heat-carrying sulfur treatment in a protective atmosphere.

[0040] In this way, the preparation method of the positive electrode material of the lithium-sulfur battery in the embodiment of the present invention prepares the composite carbon particle body with a three-dimensional porous structure and spherical s...

Embodiment 11

[0060] This embodiment provides a lithium-sulfur battery cathode material and a preparation method thereof. The positive electrode material of the lithium-sulfur battery includes a carbon nanotube with a mass ratio of 1:1: Ketjen black, which is spherical and has a three-dimensional porous composite carbon particle body, and at least on the surface of the composite carbon particle body and the Elemental sulfur is deposited on the pore surface of the three-dimensional porous structure.

[0061] The preparation method of the lithium-sulfur battery cathode material comprises the following steps:

[0062] S1: Using water as a solvent, prepare a carbon nanotube solution with a mass fraction of 2.5%, and prepare a Ketjen Black dispersion with a mass fraction of 2.5%, wherein the diameter of the carbon nanotube used is 10nm, and the specific surface of Ketjen Black is 1450m 2 / g; carbon nanotube dispersion liquid, Ketjen black dispersion liquid are mixed, wherein mass ratio carbon na...

Embodiment 12

[0067] This embodiment provides a lithium-sulfur battery cathode material and a preparation method thereof. The positive electrode material of the lithium-sulfur battery includes a carbon nanotube with a mass ratio of 1:1: Ketjen black, which is spherical and has a three-dimensional porous composite carbon particle body, and at least on the surface of the composite carbon particle body and the Elemental sulfur is deposited on the pore surface of the three-dimensional porous structure.

[0068] The preparation method of the lithium-sulfur battery cathode material comprises the following steps:

[0069] S1: Using water as a solvent, prepare a carbon nanotube solution with a mass fraction of 5%, and prepare a Ketjen Black dispersion with a mass fraction of 5%, wherein the diameter of the carbon nanotube used is 10nm, and the specific surface of Ketjen Black is 1450m 2 / g; carbon nanotube dispersion liquid, Ketjen black dispersion liquid are mixed, wherein mass ratio carbon nanot...

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Abstract

The invention discloses a positive electrode material of a lithium-sulfur battery, a preparation method of the positive electrode material and the lithium-sulfur battery. The lithium-sulfur battery positive electrode material comprises a composite carbon particle body, the composite carbon particle body is spherical and has a three-dimensional porous structure, the composite carbon particle body comprises carbon nanotubes and Ketjen black, and the carbon nanotubes and the Ketjen black are mixed and distributed; and elemental sulfur is at least deposited on the surface of the composite carbon particle body and the pore surface of the three-dimensional porous structure. The active layer of the positive electrode of the lithium-sulfur battery contains the positive electrode material of the lithium-sulfur battery. According to the lithium-sulfur battery positive electrode material disclosed by the invention, the composite carbon particle body formed by the carbon nanotubes / Ketjen black isa spherical and porous sulfur-loaded skeleton, so that the sulfur loading capacity is high, the energy density is high, the shuttle effect caused by polysulfide is low, and the cycling stability is good. A pole piece formed by the positive electrode material of the lithium-sulfur battery and the lithium-sulfur battery are high in energy density, good in electrolyte wettability and excellent in cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries have a high theoretical specific capacity, which is an order of magnitude higher than that of existing commercial cathode materials. For example, lithium-sulfur batteries have theoretically high specific capacity (1673mAh / g), high energy density (2600Wh / kg, 2800Wh / L), which is 7 times that of commercial lithium cobaltate / graphite lithium-ion batteries (theoretical energy density 360Wh / kg). At the same time, as a cathode material, sulfur also has the advantages of low cost, abundant reserves, and environmental friendliness, which can meet the requirements of many emerging technologies, making lithium-sulfur batteries one of the most promising candidates for electrochemical energy storage devices....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/13H01M10/052
CPCH01M4/13H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 陈成猛戴丽琴苏方远王振兵赵桦
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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