Patent ID: 8405955

Claim:
A composite electrode for an EDLC, the composite electrode comprising: a current collector having opposing first and second major surfaces; a first conductive layer formed over the first major surface; a second conductive layer formed over the second major surface; and a first carbon-based layer and a second carbon-based layer formed over respective ones of the first and second conductive layers, wherein the first and second carbon-based layers comprise activated carbon powder, the activated carbon powder comprising: pores having a size of ≦1 nm, which provide a combined pore volume of ≧0.3 cm 3 /g; pores having a size of from >1 nm to ≦2 nm, which provide a combined pore volume of ≧0.05 cm 3 /g; and <0.15 cm 3 /g combined pore volume of any pores having a size of >2 nm.