Lithium sulphur battery and manufacturing method thereof

A technology of lithium-sulfur battery and preparation process, which is applied in the field of electrochemical applications, and can solve the problems of limited lithium amount and lower specific energy of batteries, etc.

Inactive Publication Date: 2012-09-26
DALIAN LICHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent (CN 101562261A) introduces lithium into a lithium-sulfur battery composed of a sulfur positive electrode and a carbon-based negative electrode by adding a certain amount of lithium-rich material with irreversible delithiation properties to the sulfur-containing positive electrode, and the...

Method used

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  • Lithium sulphur battery and manufacturing method thereof
  • Lithium sulphur battery and manufacturing method thereof
  • Lithium sulphur battery and manufacturing method thereof

Examples

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Embodiment 1

[0020] Example 1: Using sublimed sulfur as the positive electrode, the sulfur powder, acetylene black and polyvinylidene fluoride (PVDF) were mixed uniformly at a mass ratio of 80:10:10, and N-methyl-2-pyrrolidone (NMP) was used as the solvent. Ball milled in a stainless steel ball mill tank at a speed of 250 rpm for 4 hours, and the obtained slurry was evenly coated on both sides of the current collector aluminum mesh, and then dried in a vacuum oven at 60°C for 20 hours. The coating thickness on both sides of the aluminum mesh was consistent. The thickness is 60 microns. Using natural graphite as the negative electrode, the graphite powder, acetylene black, and polyvinylidene fluoride (PVDF) are mixed uniformly at a mass ratio of 80:10:10, and N-methyl-2-pyrrolidone (NMP) is used as the solvent in a stainless steel ball mill tank. Ball mill at a speed of 250rpm for 2h, and evenly coat the obtained slurry on both sides of the current collector copper mesh, and then dry it in a...

Embodiment 2

[0023] Example 2: Using sublimed sulfur as the positive electrode, the sulfur powder, acetylene black and polyvinylidene fluoride (PVDF) were mixed uniformly at a mass ratio of 80:10:10, and N-methyl-2-pyrrolidone (NMP) was used as the solvent. Ball milled in a stainless steel ball mill tank at a speed of 250 rpm for 4 hours, and the obtained slurry was evenly coated on both sides of the aluminum foil of the current collector, and then dried in a vacuum oven at 80°C for 20 hours. The thickness of the coating on both sides of the aluminum mesh was consistent, and the total thickness was Is 60 microns. Using mesophase carbon microspheres as the negative electrode, the graphite powder, acetylene black and polyvinylidene fluoride (PVDF) are mixed uniformly at a mass ratio of 80:10:10, and N-methyl-2-pyrrolidone (NMP) is used as the solvent. Ball milled in a stainless steel ball mill tank at a speed of 250 rpm for 2 hours, the slurry will be uniformly coated on both sides of the cur...

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Abstract

The invention discloses a lithium sulphur battery taking a lithium intercalated carbon material as a negative electrode in the field of an electrochemical battery and a manufacturing method thereof. The lithium sulphur battery comprises a positive electrode, a negative electrode, electrolyte, a diaphragm and an enclosure and is characterized in that the negative electrode is a lithium intercalated carbon material, rather a normal metal lithium plate. The manufacturing method for the battery comprises the following steps: (1). coating sulfur-containing positive material on an aluminium foil, and coating carbon negative material on a copper foil; (2). winding or stacking the positive electrode, the diaphragm and the negative electrode together, wherein the outermost layer is the negative electrode; (3). separating the outermost carbon negative electrode by the diaphragm, and then winding or stacking with the metal lithium plate pressed on a copper plate; (4). connecting all positive electrodes through electrode lugs, and connecting all negative electrodes with the metal lithium plate through the electrode lugs; and (5). adding lithium-ion electrolyte and keeping the mixture for 10-20 days. According to the lithium sulphur battery and the manufacturing method thereof, lithium is intercalated in the carbon negative electrode by an electrochemical method in advance, so that the condition that high-activity metal lithium appears is avoided during a using process of the traditional lithium sulphur battery, and the safety and cycling performance of the lithium sulphur battery are improved; besides, the manufacturing cost is low, the process is simple, and the application value is great.

Description

Technical field [0001] The invention relates to a lithium-sulfur battery and a preparation method thereof. Specifically, a lithium-intercalated carbon material is used as a negative electrode instead of conventional metallic lithium, and belongs to the technical field of electrochemical applications. Background technique [0002] In recent years, with the development of consumer electronics, energy storage technology, and new energy vehicles, lithium-ion batteries are required to be greatly improved in terms of specific energy and specific power. Lithium-sulfur batteries use elemental sulfur as the positive electrode (theoretical specific capacity is 1675mAh / g) and metallic lithium as the negative electrode (theoretical specific capacity is 3830mAh / g), and the theoretical specific energy of the assembled battery reaches 2600Wh / kg. At the same time, elemental sulfur or containing Sulfur materials have the advantages of a wide range of sources, low prices, and environmental friendl...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 陈杨英耿世达
Owner DALIAN LICHANG NEW MATERIAL CO LTD
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