Patent ID: 8367250

Claim:
A power storage device including an electrode layer ( 3 , 5 , 9 , 11 ) and a collector layer ( 1 , 7 ) associated with the electrode layer, comprising: a barrier layer ( 2 , 6 , 8 , 12 ) formed from a metallic nitride, the barrier layer ( 2 , 6 , 8 , 12 ) being inserted between the electrode layer ( 3 , 5 , 9 , 11 ) and the collector layer ( 1 , 7 ), the barrier layer ( 2 , 6 , 8 , 12 ) being adapted to prevent diffusion of ions contained in an electrolyte ( 13 , 14 , 16 ) up to the collector layer ( 1 , 7 ), wherein the barrier layer ( 2 , 6 , 8 , 12 ) formed from metallic nitride MeN x , in which Me is at least one metal, has a stoichiometry x of between 0.85 and 1.05, a grain size of between 10 and 30 nanometers, and a thickness of between 0.15 and 0.30 micrometers.