Lithium-sulfur battery cathode material and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult to control sulfur content, low sulfur utilization rate, sulfur overflow, etc., and achieve easy mass production and high sulfur content. , the effect of inhibiting dissolution

Active Publication Date: 2012-11-14
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is affected by factors such as holding time, air flow velocity, and heating and cooling rate, and it is difficult to control the sulfur content. At the same time, due to the influence of the carrier gas, a large amount of sulfur substances in the raw material will overflow with the gas, resulting in a low utilization rate of sulfur in the raw material.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Mesoporous metal-organic framework Cr 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 O as the framework material of the composite cathode material, the selected mesoporous metal-organic framework Cr 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 The specific surface area of ​​O is 3600m 2 / g, the mesopore structure of the material accounts for 30% of the entire pore structure. Completely dissolve sodium thiosulfate in deionized water to make a reactant solution with a sodium thiosulfate concentration of 0.1mol / L, take 500mL of the reactant solution and add it to a 1000mL beaker; Cr 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 Adding 0.178 g of mesoporous metal-organic framework material Cr at a mass ratio of O to 9:1 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 O, use a constant temperature magnetic stirrer to stir for 0.5 hours to obtain a uniformly dispersed mixed reaction stock solution; under the condition of maintaining a constant temperature of 50°C, slowly drop 0.5mol / L hydrochloric acid solution into the mixed rea...

Embodiment 2

[0046] Mesoporous metal-organic framework Cr 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 O as the framework material of the composite cathode material, the selected mesoporous metal-organic framework Cr 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 The specific surface area of ​​O is 3600m 2 / g, the mesopore structure of the material accounts for 30% of the entire pore structure. Completely dissolve potassium thiosulfate in deionized water to make a reactant solution with a potassium thiosulfate concentration of 0.05mol / L, take 500mL of the reactant solution and add it to a 1000mL beaker; Cr 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 Adding 0.4 g of mesoporous metal-organic framework material Cr at a mass ratio of O to 8:2 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 O, use a constant temperature magnetic stirrer to stir for 1 hour to obtain a uniformly dispersed mixed reaction stock solution; under the condition of maintaining a constant temperature of 45°C, slowly drop 0.2mol / L sulfuric acid solution into the mixed react...

Embodiment 3

[0048] Mesoporous metal-organic framework Cr 3 F(H 2 O) 3 O(BTC) 2 ·nH 2 The preparation process of the composite cathode material of O, the selected mesoporous metal-organic framework Cr 3 F(H 2 O) 3 O(BTC) 2 ·nH 2 The specific surface area of ​​O is 2700m 2 / g, the mesopore structure of the material accounts for 40% of the entire pore structure. Completely dissolve potassium thiosulfate in deionized water to make a reactant solution with a potassium thiosulfate concentration of 0.05mol / L, take 500mL of the reactant solution and add it to a 1L beaker; Cr 3 F(H 2 O) 3 O(BTC) 2 ·nH 2 Adding 0.686g of mesoporous metal-organic framework Cr at a mass ratio of O to 7:3 3 F(H 2 O) 3 O(BTC) 2 ·nH 2 O, use a constant temperature magnetic stirrer to stir for 0.5 hours to obtain a uniformly dispersed mixed reaction stock solution; under the condition of maintaining a constant temperature of 25°C, slowly drop 0.2mol / L hydrochloric acid solution into the mixed reaction s...

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Abstract

The invention discloses a lithium-sulfur battery cathode material and a preparation method thereof. The cathode material is formed by in-situ compositing of a mesoporous metal-organic framework and elemental sulfur. The mesoporous metal-organic frame is of a laminated pore structure consisting of a macro pore, a meso pore and a micro pore, wherein the pores are communicated with one another. The structure can adsorb more elemental sulfur and can simultaneously inhibit the dissolution of sulfur elementary substance and multi-sulfur compounds in electrolyte, so that the cycle performance of a lithium-sulfur battery is improved and high utilization rate of an active substance of the cathode material is kept. A sulfur and metal-organic framework material composite cathode material is prepared by a two-step process of low-temperature liquid phase composition and sulfur extraction, a composite material precursor with homogeneously dispersed high load sulfur content can be obtained through in-situ compositing at a low temperature with a liquid-phase preparation method, redundant sulfur on the surface of the precursor and in pore passages is extracted by an organic solvent, the aperture of the composite material can be further effectively adjusted and controlled, selective distribution of sulfur is realized, and the composite material with excellent electrochemical performance is obtained. By adopting the preparation method, the distribution of the sulfur in the composite material can be effectively improved, and the electrochemical performance of the composite material is optimized. Meanwhile, the preparation method is simple and is easy to perform industrially, and mass production is facilitated.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] With the development of human society, problems such as energy shortage and environmental pollution have become increasingly prominent, and people's understanding and requirements for chemical power sources have become higher and higher, prompting people to continuously explore new energy storage systems based on chemical power sources. Lithium metal-based batteries have led the development of high-performance chemical power sources in recent decades. With the successful commercialization of lithium-ion batteries, countries around the world are stepping up research on lithium-ion power batteries for vehicles. However, due to factors such as energy density, safety, and price, conventional lithium-ion batteries such as lithium cobalt oxide, lithium manganese oxide, and lithium iron pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38
CPCY02E60/12Y02E60/10
Inventor 张治安包维斋邓兆丰卢海赖延清李劼刘晋
Owner CENT SOUTH UNIV
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