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Flat carbon electrode with high energy density

A high-energy-density, carbon-electrode technology, applied in the direction of hybrid capacitor electrodes, circuits, capacitors, etc., can solve the problems of limited plate thickness, large proportion of current collector mass, large equivalent series resistance, etc., to reduce internal resistance , Good bonding effect, enhanced contact effect

Active Publication Date: 2019-04-16
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a carbon electrode with high energy density, high power density and long cycle life in order to overcome the shortcomings of the existing carbon electrode, such as large equivalent series resistance, large current collector mass ratio, and limited plate thickness. Carbon electrodes, especially suitable for use in lead dioxide / activated carbon hybrid electrochemical capacitors to meet the requirements of energy storage devices for electric vehicles and hybrid vehicles, as well as energy storage devices for distributed solar and wind power stations

Method used

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  • Flat carbon electrode with high energy density
  • Flat carbon electrode with high energy density
  • Flat carbon electrode with high energy density

Examples

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Effect test

Embodiment 1

[0037] Example 1: Combining figure 1 , shown in Fig. 2, the flat carbon electrode 1 of the high energy density of the present embodiment, size is 68mm long, wide 44mm, thick 2.90mm, is in the flat lead current collector 11 that size is 66mm long, wide 42mm, thick 0.60mm Both sides are prepared by pressing the powder electrode layer 12, and the thickness of the prepared electrode plate is 2.90 mm.

[0038] combine image 3 As shown, the powder electrode layer 12 in this embodiment is composed of a three-dimensional conductive network 121 and a negative active material 122; the negative active material 122 is composed of activated carbon, a conductive agent and a water-based binder; the three-dimensional The conductive network 121 is composed of an organic conductive binder in a different phase from the active material 122, which is gradually drawn into a filament during the mixing process as the solvent volatilizes, and finally adheres to each other during the tableting proces...

Embodiment 2

[0048] Embodiment 2: The difference between this embodiment and Embodiment 1 is: the weight ratio of the various material components of the powder electrode layer 12 is as follows: a, the mass percentage of the negative electrode active material and the three-dimensional conductive network, the negative electrode Active material 65%, three-dimensional conductive network 35%; b negative electrode active material, composed of activated carbon powder 80%, graphite powder 14%, PTFE emulsion (solid content 70%) 6%; c, three-dimensional conductive network, is composed of conductive agent and An organic conductive binder composed of an organic binder has a proportion of 25% conductive agent and 75% organic binder; the conductive agent is a mixture of 10% expanded graphite and 15% acetylene black; The organic adhesive is a mixture of 40% polyurethane resin and 35% epoxy resin.

[0049] All the other are with embodiment 1.

Embodiment 3

[0050] Embodiment 3: The difference between this embodiment and Embodiment 1 is: the weight ratio of the various material components of the powder electrode layer 12 is as follows: a, the mass percentage of the negative electrode active material and the three-dimensional conductive network, the negative electrode Active material 90%, three-dimensional conductive network 10%; b negative electrode active material, composed of activated carbon powder 85%, expanded graphite 9%, PTFE emulsion (solid content 70%) 4% and CMC 2%; c, three-dimensional conductive network, composed of 70% of fluorine rubber, 20% of graphite powder and 10% of acetylene black are prepared as a conductive adhesive, and the diluent is butyl acetate.

[0051] The organic-based conductive adhesive is composed of a conductive agent and an organic-based adhesive, and the weight percentages of each component are: 15% of a conductive agent, and 85% of an organic-based adhesive; wherein the conductive agent is carbo...

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Abstract

The invention discloses a flat carbon electrode with high energy density. The flat carbon electrode comprises an active substance, a conductive network with a three-dimensional structure and a currentcollector, wherein the active substance consists of 80-90% of active carbon, 6-13% of conductive agent and 4-8% of water-based adhesive, and the sum of the components is 100%. The water-based adhesive is one or a mixture of more than two of a PTFE emulsion, an epoxy emulsion, PVDF and CMC. The conductive network is a conductive adhesive composed of a conductive agent (15-35%) and an organic binder (65-85%). The organic adhesive is one or a mixture of more than two of epoxy resin, polyurethane, fluororubber and chloroprene rubber. And the conductive network with the three-dimensional structureis formed by gradually pulling an organic conductive binder with a phase different from that of the active substance into filaments along with the volatilization of the solvent in the mixing processand finally adhering the filaments in the tabletting process. The carbon electrode provided by the invention has the characteristics of high capacity and high power.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage devices, and in particular relates to a novel high-energy-density carbon electrode and a preparation method thereof. Background technique [0002] With the continuous development of the economy, energy, resources and the environment have become the focus of society. It is an urgent and arduous task for human society to find clean, renewable and resource-saving energy. [0003] Currently, there are three main types of energy storage devices in the energy field: batteries, physical capacitors, and electrochemical capacitors (also known as supercapacitors). Electrochemical capacitor is a new type of green energy storage device developed in recent years between the characteristics of traditional physical capacitors and batteries. It has fast charge and discharge characteristics, high power density (more than several dozen times that of ordinary batteries), and Long service life (the numb...

Claims

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Application Information

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IPC IPC(8): H01G11/26H01G11/30H01G11/38H01G11/46H01G11/68H01G11/70H01G11/86H01G11/04
CPCH01G11/04H01G11/26H01G11/30H01G11/38H01G11/46H01G11/68H01G11/70H01G11/86Y02E60/13
Inventor 高建峰
Owner SUZHOU UNIV
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