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Combination electrode for all vanadium redox flow battery and preparation thereof

A technology for flow batteries and composite electrodes, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of high volume resistivity, achieve high modulus, meet mechanical properties, and high conductivity.

Inactive Publication Date: 2008-12-31
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical and processing properties are relatively good, but its volume resistivity is still relatively high

Method used

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  • Combination electrode for all vanadium redox flow battery and preparation thereof
  • Combination electrode for all vanadium redox flow battery and preparation thereof
  • Combination electrode for all vanadium redox flow battery and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0028] The following is a specific embodiment, and the preparation of the composite electrode includes the following steps:

[0029] 1. Thermoplastic polymer plasticization: Weigh the thermoplastic polymer at 150-200°C and plasticize it with a double-roll rubber mill for 5-10 minutes to make it into a uniform sheet.

[0030] 2. Composite conductive material: 5-10 parts of conductive graphite powder, 30-60 parts of conductive carbon black, and 20-40 parts of conductive carbon fiber are mixed evenly.

[0031] Conductive carbon fiber can be divided into: cellulose-based (rayon-based); polyacrylonitrile (PAN)-based; pitch-based, of which polyacrylonitrile-based carbon fiber is the fastest growing and most widely used.

[0032] The properties of several common conductive carbon fibers are shown in Table 1:

[0033] Table 1

[0034] Types of

product name

density

(g / cm 3 )

Tensile modulus

(GPa)

Tensile Strength

(MPa)

Resistiv...

Embodiment 1

[0053] Embodiment 1: Screening of conductive filler

[0054] Weigh the thermoplastic elastomer polymer hydrogenated styrene-butadiene-styrene copolymer at 160°C for 5-10 minutes with a double-roll rubber mill to make it into a uniform sheet.

[0055] Weigh the conductive filler according to the ratio of the mass ratio of the thermoplastic elastomer polymer to 1:2.3; add it to the plasticized thermoplastic elastomer polymer and refine it with a double-roll rubber mill for 5 to 15 minutes, so that the conductive filler and thermoplastic The elastomer polymer is mixed evenly to obtain a sheet-like conductive material. Then put it into a metal mold frame, and use a flat vulcanizer to press this conductive material into a rectangular thermoplastic conductive plate at a temperature of 180°C.

[0056] Then place the graphite felt on the thermoplastic conductive plate, compress the graphite felt to 1 / 2 to 2 / 3 of the original thickness with a flat vulcanizer, and press at 180°C for 10...

Embodiment 2

[0068] Embodiment 2 is to the screening of base material thermoplastic polymer

[0069] The ratio of conductive materials in this embodiment is CB / C / CF=23 / 3 / 20.

[0070] Weigh the thermoplastic polymer mixture and plasticize it with a two-roll rubber mill at 160°C for 5-10 minutes, mix evenly, and make it into a uniform sheet.

[0071] Weigh the conductive material according to the ratio of thermoplastic polymer to conductive material mass ratio of 1:3; add it to the plasticized thermoplastic and refine it with a double-roller rubber mill for 5 to 15 minutes, so that the conductive filler is mixed with the thermoplastic Evenly, a sheet-like conductive material is obtained.

[0072] Then put the conductive material into a rectangular metal mold frame of a certain size, use a flat vulcanizer to press the conductive material into a rectangular conductive plate at a temperature of 180°C, then place graphite felt on the conductive plate, and use a flat vulcanizer to press the cond...

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Abstract

The invention relates to a composite electrode used in vanadium redox flow batteries and a preparation method thereof, pertaining to the vanadium battery manufacturing field. The composite electrode is prepared by adding three conductive fillers (conductive acetylene carbon black, conductive carbon fiber and graphite) into thermoplastic polymer to obtain a thermoplastic conductive plate which is compounded together with a graphite felt. Part of the conductive carbon fiber in the graphite felt is embedded into the surface of the conductive plate to form an interpenetrating conductive network and improve the conductivity of the whole product. Therefore, the composite electrode has excellent mechanical performance and conductivity (volume resistivity is less than or equal to 0.1omega question mark cm), integrates current collector and electrode into a whole, and effectively reduces surface resistance between the current collector and the electrode; meanwhile, during the process, no additional additive which can improve conductivity is used, thus ensuring relatively good conductivity and mechanical performance, and avoiding the falling of the additive which can improve conductivity into the electrolyte of a vanadium battery.

Description

technical field [0001] The invention relates to a composite electrode for an all-vanadium redox flow battery and a preparation method thereof, belonging to the field of vanadium battery manufacturing. technical background [0002] The electrode materials currently used in vanadium batteries mainly include metal electrodes such as gold, titanium, lead, titanium-based platinum and iridium oxide, and non-metal electrodes such as carbon and graphite. The research results show that the cost of metal electrodes is too high, and they are prone to passivation after long-term use, which reduces battery performance; the etching phenomenon of non-metallic single electrodes is serious. The polymer conductive composite electrode is a new type of vanadium battery electrode with good electrochemical performance and not easy to be etched. It is made by adding another conductive filler or conductive polymer to the polymer material to obtain a polymer conductive composite material, and then ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/00
CPCY02E60/50
Inventor 罗冬梅李道玉张爱民石瑞成常志峰冉洪波林昌武周涛
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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