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Sulfur positive electrode material with core-shell structure, preparation method and application to lithium-sulfur battery

A technology of sulfur cathode material and core-shell structure, which is used in lithium batteries, nanotechnology for materials and surface science, and positive electrodes, etc. The effect of simple and improved magnification performance

Active Publication Date: 2021-02-26
北京理工大学重庆创新中心 +1
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  • 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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  • Sulfur positive electrode material with core-shell structure, preparation method and application to lithium-sulfur battery
  • Sulfur positive electrode material with core-shell structure, preparation method and application to lithium-sulfur battery
  • Sulfur positive electrode material with core-shell structure, preparation method and application to lithium-sulfur battery

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Experimental program
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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 positive electrode material with a core-shell structure, a preparation method and an application to a lithium-sulfur battery. A nano cage with the core-shell structureadopts a one-step method to directly generate metal coordination gel from a transition metal salt and an organic ligand, and the metal coordination gel is used as a skeleton and is subjected to freeze drying and high-temperature calcination treatment to obtain a coating material C-coated Fe3O4. In order to enable active substances to be distributed uniformly and give full play to structural advantages, a core-shell structure (YCF) is obtained by etching part of Fe3O4 with acid, and sulfur is encapsulated by utilizing a gap between a carbon shell and Fe3O4, so that an S / YCF material is obtained. The carbon shell and the polar core play a synergistic role of a physical barrier and a chemical adsorbent, so that the shuttle effect of polysulfide can be effectively inhibited, the maximum sulfur loading capacity is balanced by regulating and controlling the content of Fe3O4 polar spheres, the shuttle of polysulfide is inhibited, and the effect of accommodating volume expansion is achieved,and the preparation of a positive electrode with high coulombic efficiency and long service life is realized.

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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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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