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Heteropolyacid etched capsule-shaped hollow porous carbon shell, preparation method and application of heteropolyacid etched capsule-shaped hollow porous carbon shell in lithium-sulfur battery

A hollow porous, lithium-sulfur battery technology, used in lithium batteries, carbon preparation/purification, battery electrodes, etc., can solve the problems of obvious shuttle effect, low sulfur loading, and poor cycle stability.

Active Publication Date: 2021-04-23
UNIV OF JINAN
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low sulfur loading, obvious shuttle effect and poor cycle stability in existing lithium-sulfur battery cathode materials, the present invention ingeniously constructs a capsule-shaped hollow porous carbon shell etched by heteropolyacid. The material is porous carbon, Ferric oxide, tungstophosphate (K 6 P 2 W 18 o 62 14H 2 O, referred to as P 2 W 18 ) of the three-phase composite composition

Method used

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  • Heteropolyacid etched capsule-shaped hollow porous carbon shell, preparation method and application of heteropolyacid etched capsule-shaped hollow porous carbon shell in lithium-sulfur battery
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  • Heteropolyacid etched capsule-shaped hollow porous carbon shell, preparation method and application of heteropolyacid etched capsule-shaped hollow porous carbon shell in lithium-sulfur battery

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Embodiment 1

[0033] Example 1 A method for preparing a heteropolyacid-etched capsule-shaped hollow porous carbon shell

[0034] Include the following steps:

[0035] 1. Preparation of Fe 3 o 4 / P 2 W 18 / C composite material

[0036] (1) Preparation of organic framework material MIL-88A(Fe):

[0037] Dissolve 1.3 g of fumaric acid in 100 mL of a mixed solution of N,N-dimethylformamide and absolute ethanol at a ratio of 1:1 (volume ratio), ultrasonicate and stir for 30 min, then add 3 g of ferric nitrate and continue Stir at room temperature for 24 h. After the reaction is completed, the product is collected by centrifugation, washed repeatedly with deionized water three times, and vacuum-dried to obtain the metal-organic framework material MIL-88A(Fe).

[0038] The chemical formula of the above MIL-88A(Fe) is C 12 h 6 o 13 Fe 3 .

[0039] (2) MIL-88A(Fe) / P 2 W 18 Preparation of composite materials:

[0040] Take 1 g metal-organic framework material MIL-88A(Fe) and place it i...

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Abstract

The invention provides a heteropolyacid etched capsule-shaped hollow porous carbon shell. The hollow porous carbon shell comprises Fe3O4, P2W18 and C. The invention also provides a preparation method and application of the hollow porous carbon shell. In allusion to the defect of poor electrical conductivity of sulfur and reaction products thereof, a metal organic framework material is used as a template body, and the metal oxygen cluster P2W18 hybridized capsule-shaped hollow porous carbon shell composite material is obtained through a carbonization process. According to the prepared composite material with the capsule-shaped hollow porous carbon shell, the nanoscale polyoxometallate material modified on the surface of the material skeleton has high-valence transition metal elements, so that uniform deposition of sulfur and lithium sulfide can be directionally guided, and agglomeration of sulfur and lithium sulfide is inhibited. In addition, the polyoxometallate contains a large number of polar O-W-O units and can effectively adsorb polysulfide, so that the capacity and the cycle performance of the lithium-sulfur battery are improved.

Description

technical field [0001] The present invention relates to a capsule-shaped hollow porous carbon shell for lithium-sulfur battery cathode material and a preparation method thereof, in particular to a preparation method for sulfur / iron tetroxide / polyoxometalate / carbon composite material, It belongs to the field of lithium batteries. Background technique [0002] With the rapid development of the economy, the rapid increase of energy consumption, the growing energy demand of portable electronic devices and large-scale energy storage systems have promoted the exploration of batteries with high energy density and high power density. A lithium-sulfur battery with active sulfur as the positive electrode material and metal lithium as the negative electrode can provide 1675 mAh g -1 High theoretical specific capacity and 2600 Wh kg -1 The theoretical specific energy is much higher than the energy density of lithium-ion batteries. At the same time, the active material sulfur has the a...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01G41/00C01G49/08H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 高广刚王明亮刘红范林林尹迪曹云栋
Owner UNIV OF JINAN
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