Electrode having nanocrystal assembled active clusters embodied in conductive network structures, and battery having same, and fabrication method of same

A technology of nanocrystals and active clusters, applied in electrode manufacturing, active material electrodes, battery electrodes, etc., can solve problems such as unsatisfactory cycle stability, low capacitance, lack of optimization of electroactive materials, etc., and achieve unique electrochemical characteristics , Abundant raw materials, non-toxic effect of raw materials

Inactive Publication Date: 2018-12-21
丰捷国际有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, metal oxide nanoparticles and carbon-coated metal oxides are mixed directly with carbon additives and binders to help maintain conductivity, and bulk expansion leads to mechanical degradation of the electrode and thus low capacitance
Recent results using graphene or CNT additives have greatly improved electrode capacitance ratings; however, nanocrystals are directly mixed with graphene or CNT additives, so cycle stability is not satisfactory due to lack of electroactive material optimization
In addition, the reported capacitance is limited to thin films (below 2 μm), so the specific capacitance of each region still needs to be strived for practical engineering applications

Method used

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  • Electrode having nanocrystal assembled active clusters embodied in conductive network structures, and battery having same, and fabrication method of same
  • Electrode having nanocrystal assembled active clusters embodied in conductive network structures, and battery having same, and fabrication method of same
  • Electrode having nanocrystal assembled active clusters embodied in conductive network structures, and battery having same, and fabrication method of same

Examples

Experimental program
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Effect test

example 1

[0083] Preparation of Aerosol Mixture Solutions

[0084] A homogeneous mixture solution in which active nanocrystals are mixed with a surfactant and a carbon source in an aqueous solution or an organic solution is prepared. In certain embodiments, nanocrystals are active materials that have short ion diffusion lengths due to their nanoscale dimensions. Surfactants are used to disperse the nanocrystals and carbon source into individual states; and also to create pores in the resulting active material. The carbon source is used to form the carbon skeleton after the aerosol spray method, which improves the conductivity of the active material and also limits the volume change of the active material.

[0085] Active nanocrystals according to certain embodiments of the invention are nanomaterials obtained from co-precipitation and hydrothermal methods. There is no particular limitation on the production method. Other methods for making nanomaterials, such as hydrolysis and high e...

example 2

[0090] Fabrication of Active Nanocrystal Assembly Clusters

[0091] According to some embodiments of the invention, the active porous clusters are obtained by aerosol spraying using an aerosol device. figure 2 The aerosol method and the apparatus for carrying out the aerosol method are schematically shown. In certain embodiments, the apparatus includes a nebulizer 210 , a drying zone 220 and a heating zone 230 , and a filter device 240 to collect the active clusters 202 . When the carrier gas 203 is input into the nebulizer 210, it contains nanocrystals (such as Fe 3 o 4 ) is pumped into the atomizer 210 and becomes small droplets 201. The gas 203 carries the liquid droplets 201 into the drying zone 220 and the heating zone 230 , which condenses the liquid droplets 201 , thereby forming active clusters 202 . Active particles 202 are collected at the end of device 240 .

[0092] Such as image 3 As shown, particle nanocrystals assemble into clusters according to aerosol ...

example 3

[0094] Fabrication of Conductive Mesh Holding Cluster Electrodes

[0095] The collected active clusters are added to a solution containing conductive agents such as CNTs, metal nanofibers, graphene, and the like. Homogeneous mixing followed by filtration produces a free-standing composite membrane in which the electroactive material is tightly held in the mesh. The film thickness is about 1 micron to about 1 mm to facilitate subsequent handling.

[0096] The formed electrode is further coagulated by subjecting the film to a heat treatment at about 300-800°C. This improves the mesh, thereby improving electrode stability. This will Fe 3 o 4 The structure of clusters trapped in a flexible conductive network provides a flexible matrix that tolerates volume changes and prevents pulverized Fe 3 o 4 The particles separate and coalesce during battery electrode cycling.

[0097] Alternatively, the active material is mixed with carbon or decomposable polymers to form a viscous sl...

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Abstract

In one aspect of the invention relates to an electrode usable for a battery including a conductive network and active clusters embodied in the conductive network, where the active clusters are of a three-demission (3-D) structure formed of an assembly of nanocrystals, and the nanocrystals are assembled into a carbon skeleton in the active clusters.

Description

[0001] Cross references to related patent applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 286,632, filed January 25, 2016, and U.S. Patent Application No. 15 / 408,579, filed January 18, 2017, both of which are in their entirety Incorporated herein by reference. technical field [0003] The present invention essentially relates to a method for the manufacture of anode and cathode active materials for lithium-ion batteries, wherein said active materials are assembled from nanocrystals and further embodied in conductive carbon. Background technique [0004] The background description provided herein is for the purpose of presenting the context of the invention substantially. The subject matter discussed in the Background of the Invention section should not be assumed to be prior art merely by virtue of its mention in the Background of the Invention section. Similarly, issues mentioned in or related to the subject matter of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/133H01M4/1393H01M4/02
CPCH01M4/13H01M4/139C04B35/62222C04B35/63416C04B35/63424C04B35/63444C04B2235/3232C04B2235/3239C04B2235/3256C04B2235/3258C04B2235/3262C04B2235/3268C04B2235/3272C04B2235/3275C04B2235/3277C04B2235/3279C04B2235/3281C04B2235/3286C04B2235/3293C04B2235/40C04B2235/404C04B2235/42C04B2235/428C04B2235/447C04B2235/5288C04B2235/5292C01B32/05C04B35/52C04B35/6264C04B35/634C04B2235/422H01M4/0404H01M4/0419H01M4/0471H01M4/625Y02E60/10C04B35/62695C04B35/638C04B2235/85C04B2235/96H01M4/131H01M4/52H01M4/661H01M10/0525
Inventor 徐建国
Owner 丰捷国际有限公司
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