Physical and Chemical Properties of Anode Carbon Blocks
Anode Carbon Blocks are an important material used in the manufacture of lead–acid batteries. They are typically made of carbonized polyacrylonitrile (PAN) that has been mixed with an aqueous binder solution. Anode Carbon Blocks are produced in a variety of shapes, sizes, and hardness variations depending on the desired application. The physical and chemical properties of Anode Carbon Blocks are important to consider when determining the best product for a particular application.
Physical Properties:
Anode Carbon Blocks typically have a high bulk density, typically ranging between 1000 and 1300 kg/m3, depending on the application. The surface area of the block will vary depending on the manufacturing process, and can be tailored according to application. Anode Carbon Blocks have a wide range of hardness, from soft (~1MPa), to medium (~2MPa) and hard (~5MPa). The internal porosity of the block is typically very small, ranging from 0.01–10%.
Chemical Properties:
Anode Carbon Blocks are typically composed of carbonized polyacrylonitrile (PAN) that has been mixed with a binder solution. The binder is usually a polyacrylic acid (PAA) with a molecular weight in the range of 800–6000. The PAA solution helps to collate and unify the individual PAN particles, creating a high-strength block.
The chemical composition of Anode Carbon Blocks will determine the electrical conductivity, porosity, and strength of the block. Generally, increasing the PAN content will increase the blocks conductivity, while decreasing the amount of PAA binder decreases the blocks porosity and strength.
The chemical composition of Anode Carbon Blocks will also affect the blocks chemical resistance. The higher the percentage of PAN, the less able the block is to resist aggressive chemical attacks. The PAA binder helps to protect the block from corrosion, but can be easily attacked by strong acids and bases.
Anode Carbon Blocks can also be treated with an oxide coating to improve its corrosion resistance. This oxide coating is typically made of titanium dioxide, which helps to optimize the surface for corrosion resistance.
Overall, Anode Carbon Blocks are a useful material for the manufacturing of lead–acid batteries, due to their wide variety of physical and chemical properties. These properties can be tailored to achieve the desired performance for a particular application.
