Patent ID: 8669012

Claim:
An anode comprising: an anode active material layer including an anode active material on an anode current collector, the anode active material layer including silicon (Si) and having a plurality of pores in a diameter range of 3 nm to 15000 nm, wherein after at least one electrode reaction the active anode material has a volumetric capacity, of a pore group of the plurality of pores with a diameter ranging from 3 nm to 200 nm both inclusive, of 0.3 cm 3 /g or less, as calculated per unit weight of silicon and as measured by mercury porosimetry, and a rate of change in an amount of mercury intruded into the plurality of pores is distributed amongst the diameter range of 3 nm to 15000 nm so as to have a peak in a diameter range from 200 nm to 15000 nm both inclusive, the rate of change in the amount of mercury intruded being measured by mercury porosimetry.