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Graphene-containing electrochemical device

A device structure and graphene technology, applied in structural parts, circuits, electrical components, etc., can solve the problems of poor conductivity and compatibility of positive and negative materials, affecting the performance of electrochemical devices, etc.

Inactive Publication Date: 2015-04-29
ENERAGE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The aforementioned prior art focuses on improving the current collection layer in the electrochemical device, and the conductivity of the current collection layer is improved by adding a graphene layer. However, the bottleneck of the efficiency of the electrochemical device is usually the poor conductivity of the positive and negative materials. good, and the poor compatibility between the various structural layers leads to high interfacial resistance and thus affects the performance of the electrochemical device. To really improve the efficiency bottleneck of the electrochemical device, we should start from the above two points

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Put the graphene sheet into N-methylpyrrolidone (NMP) solvent, then add polyvinylidene fluoride (PVDF) as a polymer binder, and ball mill the prepared slurry for several hours to make a graphene slurry , and then spray the graphene slurry on the metal aluminum foil substrate, and dry it to fully volatilize the N-methylpyrrolidone (NMP) solvent to form the positive / negative current collection layer. Next, 80wt% activated carbon positive electrode active material, 10wt% graphene powder and 10wt% polymer binder are added in proportion to N-methylpyrrolidone solvent to prepare slurry, and then the materials are uniformly mixed by ball milling. Form the slurry of its positive electrode active material; add the negative electrode active material of 80wt% activated carbon, 10wt% graphene powder and 10wt% polymer binder in proportion to the preparation slurry in N-methylpyrrolidone solvent, and then ball mill The method is to mix the materials uniformly to form the slurry of th...

Embodiment 2

[0044] Put the graphene sheet into N-methylpyrrolidone (NMP) solvent, then add polyvinylidene fluoride (PVDF) as a polymer binder, and ball mill the prepared slurry for several hours to make a graphene slurry , and then spray the graphene slurry on the metal aluminum foil substrate, and dry it to fully volatilize the N-methylpyrrolidone (NMP) solvent to form the positive / negative current collection layer. Then, 80wt% activated carbon positive electrode active material, 10wt% conductive graphite, and 10wt% polymer binder were added in proportion to N-methylpyrrolidone solvent with 50wt% graphene to prepare slurry, and then ball milled to make each The materials are uniformly mixed to form a slurry of its positive active material; the negative active material of 80wt% activated carbon, 10wt% conductive graphite and 10wt% polymer binder are added in proportion to N-methylpyrrolidone solvent with 50wt% graphene The slurry is prepared in the medium, and then the materials are unifo...

Embodiment 3

[0046] Put the graphene sheet into N-methylpyrrolidone (NMP) solvent, then add polyvinylidene fluoride (PVDF) as a polymer binder, and ball mill the prepared slurry for several hours to make a graphene slurry , and then spray the graphene slurry on the metal aluminum foil substrate, and dry it to fully volatilize the N-methylpyrrolidone (NMP) solvent to form the positive / negative current collection layer. Then, 85wt% lithium iron phosphate with graphene, 7wt% conductive graphite, 3.75wt% binder and 4.25wt% N-methylpyrrolidone were mixed uniformly by ball milling to prepare positive electrode active material slurry , prepared with 80wt% activated carbon, 10wt% graphene, 10wt% binder and N-methylpyrrolidone, and then mixed the materials uniformly by ball milling to form negative active material slurry; / Negative electrode current collection layer, and placed in a vacuum oven to dry it. The positive / negative electrode current collection layers formed with the positive / negative ...

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Abstract

A graphene-containing electrochemical device includes cathode / anode current collectors, cathode / anode active layers and a separator. The cathode / anode active layers are formed on the cathode / anode current collectors, and include a metal foil substrate and a graphene conductive layer. The graphene conductive layer includes several first graphene sheets and the polymer binder used to bind the first graphene sheets. The cathode / anode active layers include several second graphene sheets and cathode / anode active particles. The second graphene sheets and the cathode / anode active particles are bound by the polymer binder and further adhered to the graphene conductive layer. The second graphene sheets are blended among the cathode / anode active particles. The graphene conductive layer is employed to increase the compatibility between the cathode / anode active material and the metal foil substrate, and to reduce the junction resistance, thereby forming an integrated conductive network and improving the performance of the elements in the device.

Description

technical field [0001] The invention relates to an electrochemical device, especially an electrochemical device containing graphene. Background technique [0002] Single-layer graphite, also known as graphene, is a two-dimensional honeycomb lattice structure in which a single layer of carbon atoms is tightly packed with graphite bonds (sp2), so it is only one carbon atom thick and graphite bonds It is a compound bond of covalent bond and metal bond, which can be said to be the perfect combination of insulator and conductor. In 2004, Andre Geim and Konstantin Novoselov of the University of Manchester in the United Kingdom successfully used adhesive tape to peel off graphite, confirming that a single layer of graphene can be obtained, and won the 2010 Nobel Prize in Physics. [0003] Graphene is currently the thinnest and hardest material in the world. Its thermal conductivity is higher than that of carbon nanotubes and diamond. At room temperature, its electron mobility is a...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/66H01G11/68H01G11/30
CPCH01G11/26H01G11/28H01G11/32H01M4/13H01M4/133H01M4/134H01M4/622H01M4/623H01M4/625H01M4/661H01M10/052H01M50/44Y02E60/10Y02E60/13
Inventor 吴以舜谢承佑陈静茹谢淑玲
Owner ENERAGE INC
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