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Lithium-sulfur battery cathode material, preparation method, and lithium-sulfur battery

A cathode material, lithium-sulfur battery technology, applied in the field of lithium-sulfur battery cathode materials, lithium-sulfur battery materials, preparation, can solve the problem of reducing the electrochemical activity of the sulfur electrode conductivity, reducing the discharge capacity of the sulfur cathode, and the limited effect of coating, etc. problems, to achieve the effect of accelerating the electrode reaction kinetics, inhibiting the shuttle effect, and facilitating penetration

Active Publication Date: 2015-07-15
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods objectively have a certain effect on inhibiting the dissolution of polysulfides in the electrolyte, and also improve the cycle stability of lithium-sulfur batteries, but there are also many problems, such as complex process, high cost, and reduced sulfur electrodes. Conductivity and electrochemical activity of the reaction
Therefore, although the existing coating methods can improve the cycle stability of lithium-sulfur batteries, at the cost of reducing the discharge capacity of the sulfur cathode, the effect of coating is limited.

Method used

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  • Lithium-sulfur battery cathode material, preparation method, and lithium-sulfur battery
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  • Lithium-sulfur battery cathode material, preparation method, and lithium-sulfur battery

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Embodiment 1

[0040] The positive electrode material of the lithium-sulfur battery in this embodiment includes a carbon-sulfur composite material, and the surface of the carbon-sulfur composite material is coated with a carbon coating layer, wherein the thickness of the carbon coating layer is 0.5 μm, and the pore volume of the carbon coating layer is 0.284 cm 3 / g, the particle size of the carbon-sulfur composite material is 2 μm.

[0041] The preparation method of the lithium-sulfur battery positive electrode material in this embodiment, the specific operation steps are:

[0042] 1) Put 1.8g of carbon nanotubes with a diameter of 20-40nm, 3.9g of sublimed sulfur, and 0.3g of glycine in an agate ball mill jar, control the speed of the planetary ball mill to 400r / min, and mill for 6 hours to obtain a uniform mixture;

[0043] 2) Transfer the homogeneous mixture prepared in step 1) to a vacuumable container, control the vacuum degree to 0.085MPa, raise the temperature from 25°C to 155°C, and...

Embodiment 2

[0050] The positive electrode material of the lithium-sulfur battery in this embodiment includes a carbon-sulfur composite material, and the surface of the carbon-sulfur composite material is coated with a carbon coating layer, wherein the thickness of the carbon coating layer is 4 μm, and the pore volume of the carbon coating layer is 0.241 cm 3 / g, the particle size of the carbon-sulfur composite material is 14 μm.

[0051] The preparation method of the lithium-sulfur battery positive electrode material in this embodiment, the specific operation steps are:

[0052] 1) 1.2g graphene, 4.2g sublimated sulfur, and 0.6g phenolic resin are placed in the ball mill jar of agate, the rotating speed of the planetary ball mill is controlled at 900r / min, and the ball mill is 12h to obtain a uniform mixture;

[0053] 2) Transfer the homogeneous mixture prepared in step 1) to a vacuumable container, control the vacuum degree to 0.095MPa, raise the temperature from 25°C to 155°C, and the h...

Embodiment 3

[0060] The positive electrode material of the lithium-sulfur battery in this embodiment includes a carbon-sulfur composite material, and the surface of the carbon-sulfur composite material is coated with a carbon coating layer, wherein the thickness of the carbon coating layer is 6 μm, and the pore volume of the carbon coating layer is 0.346 cm 3 / g, the particle size of the carbon-sulfur composite material is 27 μm.

[0061] The preparation method of the lithium-sulfur battery positive electrode material in this embodiment, the specific operation steps are:

[0062] 1) Put 2.1g meso-microporous carbon, 3.0g high-purity sulfur with a purity of 99.95%, and 0.90g precursor in an agate ball mill jar, where the precursor is a mixture of glucose and glycine at a mass ratio of 1:1 , control the rotating speed of planetary ball mill 600r / min, ball mill 20h, obtain homogeneous mixture;

[0063] 2) Transfer the homogeneous mixture prepared in step 1) to a vacuumable container, control...

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Abstract

The invention discloses a lithium-sulfur battery cathode material, a preparation method, and a lithium-sulfur battery, and belongs to the technical field of lithium-sulfur battery materials. The lithium-sulfur battery cathode material is a carbon-sulfur composite material, which is coated by a carbon cladding layer with a micro-porous structure. In the preparation method, under a vacuum condition, the raw materials are heated, just in one step, the sulfur and the carbon matrix are uniformly combined, the carbon precursor is carbonized, and the coating on the carbon-sulfur composite material is achieved. Compared with the conventional low-temperature coating method, the carbon cladding layer, which is carbonized at a high temperature and has a micro-porous structure, can form interactions just like the chemical bonds with the carbon-sulfur composite material; so that the micro-porous carbon cladding layer and the carbon-sulfur composite material are tightly combined together, thus the sulfur and discharge products cannot be easily dissolved in the electrolyte, the shuttling effect is prevented, the utilization rate of sulfur is improved, at the same time, the conductivity of the cathode material is better improved, and the cycle stability and capacity retention rate of the lithium-sulfur battery are both improved.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur battery materials, in particular to a lithium-sulfur battery cathode material, a preparation method and a lithium-sulfur battery. Background technique [0002] In recent years, with the decline of oil production and the intensification of global environmental pollution, countries around the world have generally recognized that clean and pollution-free electric vehicles to replace fuel vehicles is an inevitable choice for a country's sustainable development. The power battery technology with high specific capacity has become the key to the development of pure electric vehicles. At the same time, the rapid development of communication technology, space technology, and national defense industry has also greatly promoted the demand for small-volume, high-capacity rechargeable batteries. At present, lithium-ion batteries using lithium cobalt oxide, lithium manganese oxide, and lithium iron phos...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/052B82Y30/00
CPCB82Y30/00H01M4/13H01M4/133H01M4/139H01M4/1393H01M4/362H01M4/364H01M4/366H01M4/38H01M4/583H01M4/587H01M10/052H01M2004/028H01M2220/20Y02E60/10
Inventor 杨书廷田拴宝董红玉尹艳红曹朝霞
Owner HENAN NORMAL UNIV
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