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A kind of composite electrode material for positive electrode of lithium-sulfur battery and preparation method thereof

A composite electrode and electrode material technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of active material sulfur loss and sulfur loss, and achieve the effects of reduced impact, low cost, and easy large-scale preparation

Active Publication Date: 2017-10-31
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biggest challenge in the process of this scheme is how to overcome the loss of active material sulfur caused by the high temperature environment of the carbonization process
Usually, the carbonization temperature is about 600 degrees Celsius. In order to obtain a higher degree of graphitization and improve electrical conductivity, the temperature needs to be higher. The melting point of elemental sulfur is 115 degrees Celsius and the boiling point is 444 degrees Celsius, which will inevitably lead to the loss of sulfur during carbonization.

Method used

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  • A kind of composite electrode material for positive electrode of lithium-sulfur battery and preparation method thereof
  • A kind of composite electrode material for positive electrode of lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mix sulfur and Super P carbon powder in a ball mill tank with a mass ratio of 3:1, and then keep it in an argon-protected tube furnace at 155 degrees Celsius for 2 hours to liquefy the elemental sulfur and enter the pores constructed by the carbon powder , to obtain carbon-sulfur complexes.

[0040]Blend it with polytetrafluoroethylene emulsion (PTFE, 5% mass fraction) in ethanol to obtain electrode slurry, in which the mass ratio of the compound to polytetrafluoroethylene is 4:1, and the ratio of solid matter to solvent It is 20mg solid / ml solvent; the sheet electrode is prepared by rolling, and dried at 60 degrees Celsius, wherein the sulfur density is 3mg / cm 2 .

[0041] The electrode obtained by the above process is used as the positive electrode to prepare and assemble the lithium-sulfur battery, and discharge at 0.1C to convert the elemental sulfur into lithium sulfide; under an inert atmosphere, the discharged positive electrode is cleaned with ethylene glycol d...

Embodiment 2

[0046] The composite of carbon and lithium sulfide was prepared by the same process as in Example 1, and the carbon material was KB300.

[0047] The above compound is placed under an argon atmosphere, the argon flow rate is 30ml / min, acetylene is the carbon source, the flow rate is 15ml / min, at 900 degrees Celsius, vapor deposition for 2 hours, and naturally cooled to room temperature; Composite electrode material. The positive electrode for lithium-sulfur batteries was prepared by the same process as in Example 1, wherein the composite areal density was 4 mg / cm 2 .

[0048] Assemble a lithium-sulfur battery, charge and then discharge at 0.1C, 100 cycles, the capacity retention rate is 78%.

Embodiment 3

[0050] The composite of carbon and lithium sulfide was prepared by the same process as in Example 1, wherein carbon nanotubes were selected as the carbon material.

[0051] The above compound is placed under an argon atmosphere, the argon flow rate is 30ml / min, benzene is the carbon source, the flow rate is 0.2ml / min, at 900 degrees Celsius, vapor deposition for 2 hours, and naturally cooled to room temperature; composite electrode materials. The positive electrode for lithium-sulfur batteries was prepared by the same process as in Example 1, wherein the composite areal density was 4 mg / cm 2 .

[0052] Assemble a lithium-sulfur battery, charge and then discharge at 0.1C, 100 cycles, the capacity retention rate is 80%.

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Abstract

The invention relates to a composite electrode material for the positive electrode of a lithium-sulfur battery and a preparation method thereof, which is composed of carbon material and lithium sulfide. The reaction generates a carbon layer on the surface of the substrate, and the lithium sulfide is sealed and coated in the pores of the carbon. The mass fraction of lithium sulfide in the composite electrode material is 40% to 89%. The lithium-sulfur battery positive electrode material prepared by the method can effectively avoid the dissolution and diffusion of polysulfides during charging and discharging, thereby improving the cycle stability and capacity of the battery.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to an electrode material for positive electrodes of lithium-sulfur batteries. Background technique [0002] With the rapid development of electronics, communication equipment and electric vehicles, people put forward higher requirements for battery performance. Lithium-sulfur battery is a secondary battery that uses metallic lithium as the negative electrode and sulfur as the positive electrode active material. Metal lithium as the negative electrode material has the lowest theoretical voltage, and its theoretical specific capacity is as high as 3,862mAh / g, and the specific capacity of sulfur as the positive electrode active material is also as high as 1,672mAh / g. Therefore, lithium-sulfur batteries have extremely high specific energy. Taking lithium as the standard, its theoretical value can reach 2,600Wh / kg, and the actual specific energy is much higher than t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/1397
CPCH01M4/139H01M4/362H01M4/5815H01M4/583Y02E60/10
Inventor 张益宁张华民王美日马艺文
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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