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Intercalation material for lithium-sulfur battery

A lithium-sulfur battery and intercalation material technology, which is applied in the direction of lithium batteries, battery components, non-aqueous electrolyte batteries, etc., can solve the problem of poor uniformity of slurry coating intercalation materials, lower battery energy density, and heavier battery Total quality and other issues, to achieve the effect of improving mechanical deformation stability, improving interface bonding strength, and improving cycle stability

Active Publication Date: 2019-06-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This coating slurry is generally composed of intercalation materials and binders, and the poor conductivity of the binders will cause a decrease in sulfur activity, and the mass of the binder itself will increase the total mass of the battery, thereby reducing the energy density of the battery
At the same time, the uniformity of the slurry coating intercalation material is not good, and the mechanical stability is relatively poor

Method used

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  • Intercalation material for lithium-sulfur battery
  • Intercalation material for lithium-sulfur battery
  • Intercalation material for lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] Preparation of a lithium-sulfur battery intercalation material:

[0033] The n-type bismuth telluride bulk target is placed on the magnetron sputtering apparatus, and the polypropylene diaphragm is placed on the substrate of the magnetron sputtering apparatus. By adjusting the sputtering pressure, sputtering voltage and sputtering time, DC sputtering is used The method makes the n-type bismuth telluride uniformly distributed on the polypropylene diaphragm.

[0034] Further, the sputtering voltage is 200-400V, and the sputtering time is 1-60 minutes.

[0035] Further, the n-type bismuth telluride bulk target is prepared by a high-temperature fusion combined plasma activation sintering method, and the specific steps are:

[0036] (1) The nominal composition is Bi 2 Te 2.3~3.0 Se 0~0.5 Weigh high-purity metal Bi powder, high-purity Te powder and high-purity Se powder, mix them evenly, and seal them in a quartz tube with a vacuum of less than 10-1MPa;

[0037] (2) Place the quartz ...

Embodiment 1

[0042] A lithium-sulfur battery intercalation material and a preparation method thereof, which include the following steps:

[0043] 1) Preparation of bismuth telluride bulk target by melting method combined with plasma activation sintering:

[0044] (1) The nominal composition is Bi 2 Te 2.7 Se 0.3 Accurately weigh out 11.1645g of Bi powder (purity 99.999%), 9.2029g of Te powder (purity of 99.999%) and 0.6328g of Se powder (purity of 99.999%), mix them evenly and seal them in a vacuum less than 10 -1 Four samples were prepared under the same conditions in the quartz tube of MPa;

[0045] (2) Put the above four quartz tubes in a melting furnace, and raise the temperature from room temperature to 900°C at a heating rate of 5°C / min. After holding for 8 hours, quench in kerosene to obtain Bi 2 Te 2.7 Se 0.3 Quenched casting

[0046] (3) Grind the above Bi 2 Te 2.7 Se 0.3 Quench the casting body and pass through 80 mesh sieve to obtain n-type Bi 2 Te 2.7 Se 0.3 Alloy powder

[0047] (4) Put...

Embodiment 2

[0051] (1) The nominal composition is Bi 2 Te 2.7 Se 0.3 Accurately weigh out 11.1645g of Bi powder (purity 99.999%), 9.2029g of Te powder (purity of 99.999%) and 0.6328g of Se powder (purity of 99.999%), mix them evenly and seal them in a vacuum less than 10 -1 Four samples were prepared under the same conditions in the quartz tube of MPa;

[0052] (2) Place the above four quartz tubes in a melting furnace, raise the temperature from room temperature to 700°C at a temperature rise rate of 5°C / min, keep it for 15h, and quench in kerosene to obtain Bi 2 Te 2.7 Se 0.3 Quenched casting

[0053] (3) Grind the above Bi 2 Te 2.7 Se 0.3 Quench the casting body and pass through 80 mesh sieve to obtain n-type Bi 2 Te 2.7 Se 0.3 Alloy powder

[0054] (4) Put the above alloy powder into a graphite mold with a diameter of 50mm and place it in a plasma activated sintering equipment, and raise the temperature from room temperature to 300°C at a heating rate of 50°C / min, while the pressure rises to ...

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses an intercalation material for a lithium-sulfur battery. The intercalation material comprises a substrate layer and an isolation layer attached to the substrate layer, wherein the substrate layer is a polypropylene diaphragm in the lithium-sulfur battery; the raw material of the isolation layer is an n-type bismuth tellurideblock, and the bismuth telluride block is directly sputtered on the polypropylene diaphragm through a magnetron sputtering method, so that a layer of thin film is formed on the substrate layer, namely the isolation layer, and the isolation layer is used for forming a barrier on the surface of the polypropylene diaphragm, the lithium polysulfide can be prevented from shuttling back and forth between positive and negative electrodes in the charging process of the lithium-sulfur battery, and the shuttle effect of the lithium polysulfide is inhibited. According to the intercalation material for the lithium-sulfur battery provided by the invention, the shuttle effect of the lithium-sulfur battery is effectively relieved, and the cycling stability of the lithium-sulfur battery is improved.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, relates to an intercalation material for lithium sulfur batteries. Background technique [0002] With the development of technologies such as electric vehicles and large-scale energy storage power stations, people’s requirements for the capacity of a single battery are gradually increasing, and the capacity of the current commercial cathode materials can no longer meet the growing application needs, which has become a limitation of lithium-ion batteries The main "bottleneck" of energy density. The theoretical specific capacity of elemental sulfur is 1675mAh / g. Using sulfur as the cathode material of lithium-ion batteries can make the theoretical energy density of the battery reach 2600W / kg, which is sufficient to meet the needs of applications such as electric vehicles. Therefore, a lithium-sulfur battery using a sulfur-containing composite as a positive electrode has becom...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M10/42
CPCY02E60/10
Inventor 贺丹琪李真黄云辉袁利霞陈杰刘德重
Owner HUAZHONG UNIV OF SCI & TECH
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