Positive electrode of lithium sulfur secondary battery

A lithium-sulfur secondary battery, cathode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of reducing battery mass specific energy and volume energy density, large volume and mass, and not providing capacity, etc. Achieve the effects of suppressing the shuttle effect, simple cathode structure, and compatible coating process

Active Publication Date: 2019-06-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the additional adsorption layer occupies a large volume and mass, does not provide capacity itself

Method used

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  • Positive electrode of lithium sulfur secondary battery
  • Positive electrode of lithium sulfur secondary battery
  • Positive electrode of lithium sulfur secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] (1) After grinding and mixing elemental sulfur with a mass ratio of 70:30 and activated carbon, it is heated to 165° C. to melt the sulfur and penetrate into the activated carbon to obtain a sulfur / carbon composite material. The obtained sulfur / carbon composite material is mixed with acetylene black and carboxymethyl cellulose in a ratio of 70:20:10, and an appropriate amount of water is added to form a slurry, which is coated on the aluminum foil fluid, and dried naturally at 100°C Dry under vacuum for 24 hours to obtain a sulfur-containing cathode material layer with a thickness of 100 microns.

[0030] (2) Grind and mix lithium vanadate, acetylene black and polyvinylidene fluoride in a ratio of 85:10:5, add an appropriate amount of N-methylpyrrolidone as a solvent to make a slurry, and coat it on the sulfur-containing cathode material layer , After natural drying, vacuum drying at 100℃ for 24h, the thickness is 50 microns.

[0031] The obtained double-l...

Example Embodiment

[0032] Example 2

[0033] (1) After grinding and mixing elemental sulfur with a mass ratio of 70:30 and activated carbon, it is heated to 165° C. to melt the sulfur and penetrate into the activated carbon to obtain a sulfur / carbon composite material. The obtained sulfur / carbon composite material is mixed with acetylene black and carboxymethyl cellulose in a ratio of 70:20:10, and an appropriate amount of water is added to form a slurry, which is coated on the aluminum foil fluid, and dried naturally at 100°C Dry under vacuum for 24 hours to obtain a sulfur-containing cathode material layer with a thickness of 60 microns.

[0034] (2) Grind and mix ferrous disulfide, acetylene black and polyvinylidene fluoride in a ratio of 80:15:5, add an appropriate amount of N-methylpyrrolidone as a solvent to make a slurry, and coat it on the sulfur-containing cathode material layer On top, air dry and vacuum dry at 100°C for 24h, with a thickness of 20 microns.

[0035] (3) After grinding and m...

Example Embodiment

[0038] Example 3

[0039] (1) After grinding and mixing elemental sulfur with a mass ratio of 50:50 with activated carbon, it is heated to 165°C to melt the sulfur and penetrate into the activated carbon to obtain a sulfur / carbon composite material. The obtained sulfur / carbon composite material is mixed with acetylene black and styrene-butadiene rubber emulsion to make a slurry. The mass ratio of the sulfur / carbon composite material to acetylene black and styrene-butadiene rubber is 70:20:10, and it is coated on the aluminum foil fluid , Dried naturally and vacuum dried at 100°C for 24h to obtain a sulfur-containing cathode material layer with a thickness of 100 microns.

[0040] (2) Grind and mix lithium iron phosphate, acetylene black and polyvinylidene fluoride in a ratio of 80:15:5, add an appropriate amount of N-methylpyrrolidone as a solvent to make a slurry, and coat it on the sulfur-containing cathode material layer , After natural drying, vacuum drying at 100℃ for 24h, th...

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Abstract

The purpose of the invention is to provide a positive electrode of a lithium sulfur secondary battery. The positive electrode of the lithium sulfur secondary battery comprises 1 to 5 layers of sulfur-containing positive electrode material layers and 1 to 5 layers of lithium-stored material layers containing a transition metal element; and the sulfur-containing positive electrode material layers and the lithium-stored material layers are alternately coated. The total thickness of the positive electrode is 50 to 800 microns, the thickness of each sulfur-containing positive electrode material layer is 1 to 500 microns, and the thickness of each lithium-stored material layer is 1 to 200 microns. The electrode provided by the invention can suppress the shuttle effect, has a lithium storage performance, and can provide partial capacity; and the positive electrode of the lithium sulfur secondary battery can provide more active sites for lithium sulfide and improve the utilization of sulfur.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur secondary batteries, in particular to a positive electrode of the lithium-sulfur secondary battery. Background technique [0002] Lithium-sulfur secondary battery is a high specific energy electrochemical energy storage system, which mainly uses sulfur as the positive electrode active material, metal lithium as the negative electrode, and lithium salt ether solution as the electrolyte. The theoretical specific capacity of elemental sulfur is as high as 1675mAh / g, which is 10 times that of the layered lithium cobalt oxide cathode material. However, the conductivity of sulfur is very poor. In order to make full use of the active substance sulfur in the electrode, a large amount of conductive agent needs to be added. More importantly, the discharge intermediate product of sulfur is highly soluble polysulfide ions, which are easy to diffuse to the negative electrode and undergo self-discharge ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/136H01M4/36H01M4/58H01M4/62
CPCY02E60/10
Inventor 张俊张文魁黄辉夏阳甘永平梁初
Owner ZHEJIANG UNIV OF TECH
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