Lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery, lithium-rich technology, applied in the field of electrochemical batteries, can solve the problems of electrolyte solution decomposition and capacity decline, unstable protective layer, cracking, etc., to achieve good application prospects, cycle performance and safety performance improvement, cost low cost effect

Inactive Publication Date: 2009-10-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after many cycles, due to the insertion and extraction of lithium ions, the protective layer becomes unstable and cracked, so that a large amount of electrolyte solution contacts lithium metal through the gaps on the protective layer, resulting in the decomposition of the electrolyte solution and continuous decline in capacity

Method used

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  • Lithium-sulfur battery and preparation method thereof
  • Lithium-sulfur battery and preparation method thereof
  • Lithium-sulfur battery and preparation method thereof

Examples

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Embodiment 1

[0020] With sublimed sulfur as the positive electrode, doped with 10% LiNi 0.5 co 0.5 o 2 , the mixture was mixed uniformly with acetylene black and polyvinylidene fluoride (PVDF) in a mass ratio of 80:10:10, and N-methyl-2-pyrrolidone (NMP) was used as a solvent, and ball milled at a speed of 200 rpm for 4 h in a stainless steel ball mill tank , the obtained paste slurry was uniformly coated on the current collector Al foil, and then dried in a vacuum oven at 60°C for 20 hours for use. Graphite is used as the negative electrode material, mixed evenly with acetylene black and polyvinylidene fluoride (PVDF) at a mass ratio of 85:10:5, and N-methyl-2-pyrrolidone (NMP) is used as the solvent, and the temperature is 200 rpm in a stainless steel ball mill tank. The speed of ball milling was 2 hours, and the obtained paste slurry was evenly coated on the current collector Cu foil, and then dried in a vacuum oven at 60°C for 20 hours for use. The sulfur electrode is used as the po...

Embodiment 2

[0023] Using carbyne polysulfide as the positive electrode, doped with 40% LiNi 0.5 co 0.5 o 2 , the mixture was mixed with acetylene black and polyethylene oxide (PEO) in a mass ratio of 80:10:10, and deionized water was used as a solvent, and ball milled for 4 hours at a speed of 200 rpm in a stainless steel ball mill tank, and the obtained paste slurry was evenly coated Cloth it on the current collector Al foil, and then dry it in a vacuum oven at 60°C for 20 hours for later use. Mesocarbon microspheres (MCMB) were used as the negative electrode material, mixed with acetylene black and polyvinylidene fluoride (PVDF) at a mass ratio of 85:10:5, and N-methyl-2-pyrrolidone (NMP) was used as the solvent. Ball milled at a speed of 200 rpm for 2 h in a stainless steel ball mill jar, and the obtained paste slurry was uniformly coated on the Cu foil of the current collector, and then dried in a vacuum oven at 60° C. for 20 hours for use. A lithium-sulfur battery was assembled wi...

Embodiment 3

[0026] With sublimed sulfur as the positive electrode, doped with 10% Li by mass 2.6 co 0.4 N, mix the mixture with acetylene black and polyvinylidene fluoride (PVDF) in a mass ratio of 80:10:10, use N-methyl-2-pyrrolidone (NMP) as solvent, and ball mill at a speed of 200rpm in a stainless steel ball mill tank 4h, the obtained paste slurry was uniformly coated on the current collector Al foil, and then dried in a vacuum oven at 60°C for 20 hours for later use. Hard carbon is used as the negative electrode material, mixed evenly with acetylene black and polyvinylidene fluoride (PVDF) in a mass ratio of 85:10:5, and N-methyl-2-pyrrolidone (NMP) is used as the solvent. Ball mill at a speed of 200rpm for 2h, and the obtained paste slurry is evenly coated on the Cu foil of the current collector, and then dried in a vacuum oven at 60°C for 20 hours for use. With the sulfur electrode as the positive electrode, the hard carbon electrode as the negative electrode, Celgrad2300 as the ...

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Abstract

The invention relates to a lithium-sulfur battery and a preparation method thereof, which belongs to the field of electrochemical batteries. The lithium-sulfur battery uses a carbon material as a negative electrode and elemental sulfur as a positive electrode, and introduces non-lithium third electrode to perform lithium-embedding treatment on the negative electrode so as to prevent the safety problem caused by directly adopting the metal lithium as the negative electrode. The main component of the non-lithium third electrode is a lithium-rich compound with certain irreversible lithium-removing property; and in the preparation process of an elemental sulfur positive electrode material, the third electrode lithium-rich compound is mixed into the material according to a mass percent of between 10 and 40 percent; and when the material is prepared into an electrode, the electrode and the carbon negative electrode form the lithium-sulfur battery. In the charging process of the battery for the first time, the lithium-rich compound achieves the lithium-embedding operation to the negative electrode.

Description

technical field [0001] The invention relates to a lithium-sulfur battery and a preparation method thereof. Specifically, the safety problem of the lithium-sulfur battery is solved by introducing a third electrode to replace the metal lithium negative electrode, and belongs to the field of electrochemical batteries. Background technique [0002] In recent years, with the continuous advancement of science and technology and the rapid development of various electronic products, the chemical power sources used are required to have the characteristics of light weight, small size, and large capacity. Although the performance of batteries can be improved to a certain extent by improving the preparation of existing battery materials and battery manufacturing processes, the development of new materials and new systems must be used to increase the energy density of batteries to a large extent. [0003] Among the many researched battery systems, metal lithium-sulfur batteries are consi...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M4/02H01M4/36H01M4/38H01M4/58H01M4/48H01M4/60
CPCY02E60/12Y02E60/10
Inventor 吴锋吴生先陈人杰陈实苏岳峰李丽王国庆陈君政
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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