Core-shell structure sulfur cathode material, preparation method and application in lithium-sulfur batteries

A sulfur cathode material, core-shell structure technology, applied in lithium batteries, nanotechnology for materials and surface science, positive electrodes, etc. The effect of high electrical conductivity and improved utilization

Active Publication Date: 2021-12-10
北京理工大学重庆创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But most metal complexes are poorly conductive, which in turn lowers the overall conductivity

Method used

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  • Core-shell structure sulfur cathode material, preparation method and application in lithium-sulfur batteries
  • Core-shell structure sulfur cathode material, preparation method and application in lithium-sulfur batteries
  • Core-shell structure sulfur cathode material, preparation method and application in lithium-sulfur batteries

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Embodiment 1

[0061] This embodiment provides a sulfur cathode material, the sulfur cathode material is Fe coated with carbon 3 o 4 Materials loaded with sulfur, denoted as S / C@Fe 3 o 4 .

[0062] (1) C@Fe 3 o 4 Preparation of:

[0063] S1, to 1.21g Fe(NO 3 ) 3 9H 2 O and 0.42g of tribenzoic acid (BTC) were added to 20ml of ethanol respectively, and after stirring for 30mins, after the two showed a yellow-brown transparent solution and a colorless transparent solution respectively, the two were mixed, and a brown-yellow hydrogel was formed immediately ;

[0064] S2, aging at normal temperature for 24h, so that the two react more fully;

[0065] S3. Wash off the incompletely reacted small molecules with ethanol and distilled water, then freeze the hydrogel at -20°C for 48h, and then transfer it to a freeze dryer for drying. The parameters at this time are -40°C, 35pa pressure, 48h Afterwards, it is brown-yellow powder;

[0066] S4. In the tube furnace, under the protection of argon...

Embodiment 2

[0085] This embodiment provides a sulfur cathode material, the sulfur host material is carbon-coated Fe etched by hydrochloric acid 3 o 4 The obtained core-shell structure YSC@Fe 3 o 4 , and uniformly named it YCF. According to its remaining Fe 3 o 4 The content is named as YCF-28, and the sulfur cathode after sulfur loading is S / YCF-28.

[0086] The method for preparing the sulfur cathode material used in this embodiment includes the following steps:

[0087] (1) C@Fe 3 o 4 Preparation of nanospheres: same as Example 1.

[0088] (2) Preparation of core-shell structure YCF nanocages:

[0089] S1. Take 1g of C@Fe 3 o 4 The powder was dispersed in 50mL of deionized water, ultrasonically dispersed at a frequency of 100kW for 30min, 66mL of hydrochloric acid (36% in mass fraction) was added, reacted for 2h, and the core-shell structure YCF-28 nanocages were obtained after vacuum filtration. The material was washed to pH ≈ 6-8, and dried in a vacuum oven at 60°C for 24 ...

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Abstract

The invention discloses a sulfur cathode material with a core-shell structure, a preparation method and an application in a lithium-sulfur battery. The core-shell structure nano cage adopts a one-step method to directly generate a metal coordination gel from a transition metal salt and an organic ligand as a skeleton After freeze-drying and high-temperature calcination, the coating material C@Fe 3 o 4 , in order to make the active material evenly distributed and give full play to the structural advantages, part of the Fe is etched by acid 3 o 4 Get the core-shell structure (YCF), using carbon shell and Fe 3 o 4 The gap between them encapsulates sulfur, resulting in S / YCF material. The synergistic effect of the carbon shell and the polar core as a physical barrier and a chemical adsorbent can effectively inhibit the shuttle effect of polysulfides, and by regulating Fe 3 o 4 The content of polar balls can balance the maximum sulfur loading, inhibit polysulfide shuttling and accommodate volume expansion, and realize the preparation of high Coulombic efficiency and long-life positive electrodes.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a core-shell structure sulfur cathode material, a preparation method and an application in lithium-sulfur batteries. Background technique [0002] Due to the high-intensity dependence on petrochemical fuels in the past, its reserves have declined sharply, and the problem of energy shortages has become increasingly apparent. As one of the clean energy sources, electric energy meets the requirements of human sustainable development, so the storage of electric energy is particularly important. Since Sony first commercialized it in 1991, secondary batteries have been a research hotspot. However, the theoretical capacity of lithium ions is relatively low. Today, with the rapid development of portable electronic devices and electric vehicles, it is gradually difficult to meet the demand. Therefore, people turn their attention to lithium-sulfur batteries with higher s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/13H01M4/139H01M10/052B82Y30/00B82Y40/00
CPCH01M4/624H01M4/625H01M4/628H01M4/38H01M4/13H01M4/139H01M10/052B82Y30/00B82Y40/00H01M2004/028H01M2004/021Y02E60/10
Inventor 卢赟赵晨颖苏岳锋陈来史宏娟李宇斯张宇清吴锋
Owner 北京理工大学重庆创新中心
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