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Lithium sulfur battery anode composite material, anode and lithium sulfur battery

A cathode material and composite material technology, applied in the field of lithium-sulfur batteries, can solve the problems of poor conductivity and easy dissolution of reactants in electrolyte, and achieve the effects of improving conductivity, high specific capacity and simple preparation process

Active Publication Date: 2011-10-05
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of poor electrical conductivity of sulfur-based positive electrode materials in the prior art, and the reactants are easily soluble in the electrolyte, and provide a carbon-coated sulfur-based positive electrode compound with high electrical conductivity and insoluble reactants in the electrolyte. Materials and preparation methods, and lithium-sulfur batteries with high specific capacity and good cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Carbon-coated sulfur-based cathode composite material: sucrose and polydithiodianiline (PDATA) were uniformly mixed at a mass ratio of 3:15, placed in a closed quartz tube, and heat-treated at 350°C for 2.5 hour to obtain the composite material.

[0030] Positive electrode composition: first, polyvinylidene fluoride is added to nitrogen methyl pyrrolidone, and stirred at high speed for 2.5 hours to form a binder solution; then, acetylene black is added to nitrogen methyl pyrrolidone and stirred at high speed for 1.5 hours to form a conductive agent suspension; Finally, the prepared carbon-coated sulfur-based cathode composite material was added to the conductive agent suspension and stirred at high speed for 0.5 hours, then the binder solution prepared in the first step was added, and then stirred at high speed for 2 hours. The rotating speed of the above stirring is 2600 rpm. The mass ratio of each component is: carbon-coated sulfur-based cathode composite material: a...

Embodiment 2

[0039] Carbon-coated sulfur-based positive electrode composite material: Glucose and polydithiodiphenylamine (PDATA) were uniformly mixed at a mass ratio of 3:15 and placed in a closed quartz tube. In a flowing argon atmosphere, heat treatment at 350°C for 2.5 hour to obtain the composite material.

[0040] Positive electrode composition: first, polyvinylidene fluoride is added to nitrogen methyl pyrrolidone, and stirred at high speed for 2.5 hours to form a binder solution; then, acetylene black is added to nitrogen methyl pyrrolidone and stirred at high speed for 1.5 hours to form a conductive agent suspension; Finally, the prepared carbon-coated sulfur-based cathode composite material was added to the conductive agent suspension and stirred at high speed for 0.5 hours, then the binder solution prepared in the first step was added, and then stirred at high speed for 2 hours. The rotating speed of the above stirring is 2600 rpm. The mass ratio of each component is: carbon-co...

Embodiment 3

[0049] Carbon-coated sulfur-based cathode composites: combining glucose and polycarbosulfur compounds (CH) x S m Mix uniformly at a mass ratio of 1:15, place in a closed quartz tube, and heat-treat at 200°C for 6 hours in a flowing argon atmosphere to obtain the composite material.

[0050] Positive electrode composition: first, polyvinylidene fluoride is added to nitrogen methyl pyrrolidone, and stirred at high speed for 2.5 hours to form a binder solution; then, acetylene black is added to nitrogen methyl pyrrolidone and stirred at high speed for 1.5 hours to form a conductive agent suspension; Finally, the prepared carbon-coated sulfur-based cathode composite material was added to the conductive agent suspension and stirred at high speed for 0.5 hours, then the binder solution prepared in the first step was added, and then stirred at high speed for 2 hours. The rotating speed of the above stirring is 2600 rpm. The mass ratio of each component is: carbon-coated sulfur-base...

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Abstract

The invention discloses a carbon coated sulfur-based anode composite material in the field of lithium sulfur batteries. The composite material comprises a sulfur-based anode material and amorphous carbon, wherein the amorphous carbon is uniformly and compactly coated on the surface of the sulfur-based anode material, the particle diameter of the sulfur-based anode material is 10 nanometers to 10 microns, and the thickness of the amorphous carbon layer is 1 to 5 nanometers. The invention also discloses an anode, which comprises a current corrector and an anode material supported on the current corrector, wherein the anode material comprises an anode active substance, anode adhesive and a conductive component; and the anode active substance is the carbon coated sulfur-based anode material. The anode is adopted for preparing a corresponding lithium sulfur battery; the amorphous carbon is coated on the surface of the sulfur-based anode active material so as to remarkably improve the electric conductivity of the anode material, and the lithium sulfur battery adopting the anode has high specific capacity and good cycle performance; and the preparation process is simple and suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to a new material in the field of lithium-sulfur batteries and a preparation method thereof, in particular to a carbon-coated sulfur-based positive electrode composite material, a positive electrode and a lithium-sulfur battery including the positive electrode. Background technique [0002] Compared with other chemical power sources, lithium-ion secondary batteries have many excellent properties, such as high energy density, long cycle life, high open circuit voltage, no memory effect, safety and pollution-free, etc. After nearly two decades of rapid development, they have become Widely used in mobile phones, notebook computers, digital cameras and other fields. At present, lithium-ion batteries have become the main trend of battery development, but with the further development of mobile devices towards miniaturization and thinning, higher requirements are placed on the energy density of batteries, and the bottleneck that limits t...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/136H01M10/052H01M4/58
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 谢皎胡蕴成王荣贵王睿
Owner DONGFANG ELECTRIC CORP LTD
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