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Preparation method of lithiumsulphur battery positive pole material

A cathode material, lithium-sulfur battery technology, used in battery electrodes, circuits, electrical components, etc., can solve problems such as inability to uniformly cover active materials, battery capacity decay too fast, and inability to form conductive networks, etc. Achieve selective distribution, solve the effect of poor conductivity

Active Publication Date: 2015-02-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the conductive agent material usually exists in the form of particles in the positive electrode material, it cannot evenly cover the surface of the active material, and cannot form an effective conductive network.
The excellent conductivity of graphene is used to improve the overall conductivity of the material to solve the problems caused by the poor conductivity of the active component sulfur in the positive electrode material of the lithium-sulfur battery, the low utilization rate of the sulfur component, the large polarization and the dissolution in the electrolyte. Causes problems such as excessive battery capacity decay

Method used

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  • Preparation method of lithiumsulphur battery positive pole material
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  • Preparation method of lithiumsulphur battery positive pole material

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Embodiment 1

[0038] Mesoporous metal-organic framework Cr 3 F(H 2 O) 3 O(BTC) 2 ·nH 2 O in situ composite preparation of graphene-coated mesoporous metal-organic framework materials, 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. Graphene oxide (GO) was mixed with water at a ratio of 2 mg / mL, and oscillated by ultrasonic waves for 0.5 h until a homogeneous solution was formed, and the prepared The mesoporous metal-organic framework material was added to the solution and stirred for 0.5h to form a precursor solution, and a mixed solution of hydrazine hydrate with a mass concentration of 80% and ammonia water with a mass concentration of 25% was added dropwise to the precursor solution at a volume ratio of 1:200 , wherein the mixing mass ratio of hydrazine hydrate and ammonia water is 9:1, and heated to reflux at 70°C for ...

Embodiment 2

[0042] Mesoporous metal-organic framework Cu 3 (TATAB) 2 (H 2 O) 3 ·8DMF·9H 2 O in situ composite preparation of graphene-coated mesoporous metal-organic framework materials, selected mesoporous metal-organic framework Cr 3 F(H 2 O) 2 O(BDC) 3 ·nH 2 The specific surface area of ​​O is 1600m 2 / g, the mesopore structure of the material accounts for 35% of the entire pore structure. Graphene oxide (GO) was mixed with water at a ratio of 0.5 mg / mL, and oscillated by ultrasonic waves for 1 h until a homogeneous solution was formed, and the prepared The mesoporous metal-organic framework material was added to the solution and stirred for 1 h to form a precursor solution. A mixed solution of hydrazine hydrate with a mass concentration of 80% and ammonia water with a mass concentration of 20% was added dropwise to the precursor solution at a volume ratio of 1:50. Among them, the mixing mass ratio of hydrazine hydrate and ammonia water is 8:2, heated and refluxed at 100°C fo...

Embodiment 3

[0044] Mesoporous metal-organic framework Cr 3 F(H 2 O) 3 O(BTC) 2 ·nH 2 O in situ composite preparation of graphene-coated mesoporous metal-organic framework materials, 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. Graphene oxide (GO) was mixed with water at a ratio of 2 mg / mL, and oscillated by ultrasonic waves for 0.5 h until a homogeneous solution was formed, and the prepared The mesoporous metal-organic framework material was added to the solution and stirred for 2 hours to form a precursor solution. A mixed solution of hydrazine hydrate with a mass concentration of 60% and ammonia water with a mass concentration of 28% was added dropwise to the precursor solution at a volume ratio of 1:100. The mixing mass ratio of hydrazine hydrate and ammonia water is 1:9, and heated to reflux at 80°C for 12 hours to...

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Abstract

The invention discloses a preparation method of a lithiumsulphur battery positive pole material. The preparation method comprises the following steps of: adopting a 'graphite olefine and mesoporous metal-organic frame in-situ composition + sulfur liquid phase infiltration' two-step process to prepare a composite positive pole material of a mesoporous metal-organic frame coated by sulfur and graphite olefine, adopting a graphite olefine and mesoporous metal-organic frame in-situ composition method, coating the graphite olefine in the surface and ducts of the layered porous structure of the mesoporous metal-organic frame, and forming an effective electric conduction network; and adopting a liquid phase infiltration method to effectively regulate and control the sizes of sulfur particles and realize sulfureous selectivity distribution so as to obtain the composite positive pole with distribution uniformity, high conductivity, high capacity sulfur content at low temperature. The preparation method can efficiently improve the distribution of sulfur in a composite material, the electrochemistry property of the composite material is optimized, meanwhile, the preparation process is simple, the preparation method is easy to implement on industry and the positive pole material can be produced in volume.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a preparation method of a cathode material of a lithium-sulfur battery. 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 phospha...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 张治安赖延清包维斋李劼王习文邓兆丰卢海
Owner CENT SOUTH UNIV
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