A kind of positive electrode material of lithium-sulfur battery, preparation method and lithium-sulfur battery

A lithium-sulfur battery and positive electrode material technology, applied in the field of lithium-sulfur battery materials, lithium-sulfur battery positive electrode materials, preparation, can solve the problem of reducing the electrochemical activity of the sulfur electrode conductivity, reducing the discharge capacity of the sulfur positive electrode, 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: 2018-02-23
HENAN NORMAL UNIV
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  • Abstract
  • Description
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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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  • A kind of positive electrode material of lithium-sulfur battery, preparation method and lithium-sulfur battery
  • A kind of positive electrode material of lithium-sulfur battery, preparation method and lithium-sulfur battery
  • A kind of positive electrode material of lithium-sulfur battery, preparation method and lithium-sulfur battery

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Effect test

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 the lithium-sulfur battery, and belongs to the technical field of lithium-sulfur battery materials. The lithium-sulfur battery positive electrode material of the present invention includes a carbon-sulfur composite material whose surface is covered with a carbon coating layer with a microporous structure. The preparation method of the present invention realizes uniform compounding of sulfur and carbon matrix and coating of carbon-sulfur composite materials by carbonization of carbon precursors in one step through heat treatment under vacuum conditions. Compared with the traditional low-temperature coating method, the vacuum high-temperature carbonized microporous carbon coating layer and the carbon-sulfur composite material of the present invention form an interaction similar to a "chemical bond", so that the microporous carbon coating layer and the carbon-sulfur composite material The tight combination between them can better inhibit the dissolution of sulfur and discharge products in the electrolyte, prevent the "shuttle effect", improve the utilization rate of sulfur, and at the same time better improve the conductivity of the positive electrode material, thereby improving the cycle stability of lithium-sulfur batteries and capacity retention.

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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Patent Type & Authority Patents(China)
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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