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Positive electrode containing cobalt sulfide and nitrogen co-doped three-dimensional graphene material and lithium/thionyl chloride battery using same

A thionyl chloride battery and graphene technology, applied in the field of electrochemistry, can solve the problems of high graphene layers, three-dimensional graphene morphology and performance differences, and performance differences, and achieve good quality, excellent performance, and high discharge platform The effect of voltage

Inactive Publication Date: 2019-01-18
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, transition metal heteroatom-doped graphene materials are mainly used in lithium-ion batteries, supercapacitors and fuel cells. In ion batteries and supercapacitors, transition metal heteroatom-doped graphene is directly used as an electrode material, while in fuel cells, it is used as a catalyst. When it is used as a catalyst, due to the difference in the catalytic mechanism of different systems and different transition The effect of metal heteroatom doping on the performance of transition metal heteroatom doped graphene makes transition metal heteroatom doped graphene not necessarily suitable for various catalytic systems, and because graphene has strong intermolecular forces, It is easy to agglomerate and stack during the preparation process, so that the number of layers of the prepared graphene is relatively high, resulting in a large difference in its performance
[0007] Three-dimensional graphene is self-assembled from two-dimensional graphene sheets. In addition to the excellent properties of graphene, it also has the advantages of a porous structure and is not easy to agglomerate. However, the morphology and properties of three-dimensional graphene prepared by different methods still exist. big difference
[0008] So far, no sulfur, nitrogen and cobalt co-doped three-dimensional graphene materials have been used as catalysts in Li / SOCl 2 Related reports in the battery

Method used

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  • Positive electrode containing cobalt sulfide and nitrogen co-doped three-dimensional graphene material and lithium/thionyl chloride battery using same
  • Positive electrode containing cobalt sulfide and nitrogen co-doped three-dimensional graphene material and lithium/thionyl chloride battery using same
  • Positive electrode containing cobalt sulfide and nitrogen co-doped three-dimensional graphene material and lithium/thionyl chloride battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Mix acetylene black, polytetrafluoroethylene (PTFE) and sulfur nitrogen cobalt co-doped three-dimensional graphene material (3D-SNCoG) in a mass ratio of 1:0.05:0.01, add an appropriate amount of ethanol aqueous solution (volume ratio of ethanol and water 1:1), mix well, and prepare a granular positive electrode through a high-speed shot blasting machine, dry it in a blast oven at 80°C for 2 hours, then dry it at 160°C for 2 hours, and then bake it at 250°C 10min, get the positive electrode;

[0071] Vacuum dry the above positive electrode at 180°C for 12 hours, add the positive electrode to the stainless steel shell cylinder with separator and lithium sheet in the drying room, press the cap, laser ring welding, and inject 1.5mol / L SOCl 2 -LiAlCl 4 Electrolyte, press steel nails, wash to get lithium / thionyl chloride battery.

Embodiment 2

[0073] Mix acetylene black, PTFE and 3D-SNCoG at a mass ratio of 1:0.05:0.04, add an appropriate amount of absolute ethanol solution, mix well, and prepare granular positive electrodes through a high-speed shot blasting machine, and place them in a blast oven at 70°C Dry in the middle for 1 hour, then dry at 170°C for 2 hours, then bake at 230°C for 10 minutes to obtain the positive electrode;

[0074] Vacuum dry the above positive electrode at 180°C for 12 hours, add the positive electrode to the stainless steel shell cylinder with separator and lithium sheet in the drying room, press the cap, laser ring welding, and inject 1.5mol / L SOCl 2 -LiAlCl 4 Electrolyte, press steel nails, wash to get lithium / thionyl chloride battery.

Embodiment 3

[0076] Mix acetylene black, PTFE and 3D-SNCoG at a mass ratio of 1:0.05:0.08, add an appropriate amount of ethanol aqueous solution (the volume ratio of ethanol and water is 1:0.5), mix well, and prepare it through a high-speed shot blasting machine. The granular positive electrode was dried in a blast oven at 60°C for 3 hours, then dried at 150°C for 3 hours, and then baked at 240°C for 10 minutes to obtain the positive electrode;

[0077] Vacuum dry the above positive electrode at 180°C for 12 hours, add the positive electrode to the stainless steel shell cylinder with separator and lithium sheet in the drying room, press the cap, laser ring welding, and inject 1.5mol / L SOCl 2 -LiAlCl 4 Electrolyte, press steel nails, wash to get lithium / thionyl chloride battery.

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Abstract

A positive electrode containing cobalt a sulfide and nitrogen co-doped three-dimensional graphene material and a lithium / thionyl chloride battery using the same are disclosed. The a sulfide and nitrogen co-doped three-dimensional graphene material included in the positive electrode and the lithium / thionyl chloride battery using the same has better electrochemical performance, its discharge specific capacity is increased by about 30.8%, and the discharge plateau voltage is increased by nearly 200 mV.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a positive electrode containing a three-dimensional graphene material co-doped with sulfur, nitrogen and cobalt and a lithium / thionyl chloride battery using the positive electrode. Background technique [0002] Lithium / thionyl chloride (Li / SOCl 2 ) batteries are widely used in aerospace, smart instrumentation and other fields. [0003] In Li / SOCl 2 In batteries, liquid SOCl 2 It is both an electrolyte and a positive electrode active material, so it has a high specific energy, SOCl 2 Reduction reaction 2SOCl adsorbed in porous carbon electrode 2 +4e - →S+SO 2 +4Cl - , carbon as SOCl 2 The carrier is also SOCl 2 reduced catalyst, but SOCl 2 The reduction reaction at the solid-liquid interface is very slow, and it is difficult to support high-current discharge, so it is necessary to add a catalyst to increase the SOCl 2 the rate of the reduction reaction. [0004] Curren...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M10/052H01M10/0563
CPCH01M4/133H01M10/052H01M10/0563H01M2004/021Y02E60/10
Inventor 钟秀文袁中直吴迪曹浪
Owner EVE ENERGY CO LTD