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| Customization: | Available |
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| Classification: | Graphitized Composites |
| Feature: | Chemical Corrosion Resistance, High Mechanical Strength, Thermal Shock Resistance, Low Resistance |
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Flexible Graphite Soft Felt is a dedicated graphite felt electrode material for flow batteries, manufactured through customized processing technologies to meet the specific performance requirements of different flow battery types. Its core production processes include non-woven needle punching, carbonization, graphitization, and fiber surface post-treatment. Featuring uniform thickness, flat (felt structure), and consistent electrochemical performance across the entire material, it has been widely applied in vanadium redox flow batteries, zinc-bromine flow batteries, and zinc-air (zinc-oxygen) flow batteries.
Preparation process
(1) PAN-based pre-oxidized fibers( Carbon Fiber) are woven and processed on high-end non-woven needle punching equipment to produce flat felt with specific thickness requirements, square meter weight, and good uniformity as raw material.
(2) Catalyst coating: At the entrance of the continuous carbon graphite furnace, the industrial flat felt of the oxide filament is first uniformly coated with sintered catalyst using specific equipment.
(3) High temperature sintering: The flat felt is continuously fed into a continuous carbon graphite furnace, where it undergoes carbonization, deposition, and graphitization treatment to obtain an intermediate product of graphite felt with a large amount of carbon nanotubes deposited on its surface.
(4) Surface treatment: The intermediate product of graphite carbon fiber is continuously introduced into the activation furnace, and the intermediate product of graphite carbon fiber with a large number of carbon nanotubes deposited on the surface is subjected to carbonylation treatment to increase the electrochemical activity of the electrode graphite felt.
Key advantages include low stack internal resistance, excellent and uniform electrochemical activity, strong corrosion resistance, minimal stack cycle degradation, and high energy efficiency.
Product Specifications
| Catagory | Details |
| Regular Width | Customized(188-190mm, 1200mm,1420mm,1450mm,etc.) |
| Regular Thickness | 1.6mm, 2.2mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.2mm, 4.35mm, 4.6mm, 4.8mm, 5.0mm, 5.6mm, 6.4mm, 7.0mm |
| Customization | Cut-to-size according to customer requriements |
Carbon felt refers to the carbonization of carbon fibers at a temperature of 1000 ºC, while graphite felt is the graphite fiber felt obtained by heating carbon fiber felt to 2000 ºC in an anaerobic environment.
Carbon felt and graphite felt are porous felt like fiber materials, which have become the main materials for electrode materials due to their extensive three-dimensional network structure, high specific surface area, good conductivity, and electrochemical stability. However, their surfaces need to be modified.
According to different substrates, graphite felt can be divided into three types: polyacrylonitrile based (PAN based) graphite felt, asphalt based graphite felt, and adhesive based graphite felt. Polyacrylonitrile based graphite felt refers to graphite felt made from polyacrylonitrile (PAN) fibers through processes such as short cutting, oxidation, carbonization, and graphitization. Compared with other graphite felts, polyacrylonitrile based graphite felt has the advantages of strong antioxidant capacity, good insulation performance, high strength, and high temperature resistance. It has a wide range of applications and is the mainstream product in the graphite felt market.
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