Carbon fiber felt, method for producing the same, anode current collector, and sodium-sulfur storage battery

摘要

PROBLEM TO BE SOLVED: To provide a carbon fiber felt having excellent conductivity, high permeability of fluids, such as molten sulfur, in the thickness direction, an excellent contact property to a negative electrode because of its easiness of bending, and excellent handleability.SOLUTION: A carbon fiber felt 2 has an uneven shape comprising a plurality of ridge parts 4 which are formed on at least one face of the carbon fiber felt 2 so as to protrude toward the outside in a belt-like shape, and groove parts 6 which are formed between the plurality of ridge parts 4 and has a thickness t of 11 to 55 mm. It is preferable that the groove 6 is formed on a surface of the felt 2 so as to have a linear shape, a lattice shape, a diamond shape or a wavy shape. It is preferable that the groove 6 is formed so as to have a groove width of 0.5 to 10 mm, a groove depth that is 10 to 90% of a thickness to the thickness t of the carbon fiber felt, and a groove pitch of 0.5 to 100 mm.