Electrochemical device

An electrochemical device, comprising:

• a positive electrode having:
• a positive-electrode collector made of conductive material;
• and a positive-electrode active-material layer formed on the positive-electrode collector;
• a negative electrode having:
• a negative-electrode collector made of conductive material and having a first principal face and a second principal face on an opposite side of the first principal face;
• a first negative-electrode active-material layer formed on the first principal face;
• and a second negative-electrode active-material layer which is formed intermittently on the second principal face and has a density of negative-electrode active material which is lower than that of the first negative-electrode active-material layer;
• separators that insulate the positive electrode and the negative electrode;
• and
• an electrolyte in which the positive electrode, negative electrode, and separators are immersed;
• wherein an uncoated area of the second principal face where the second negative-electrode active-material layer is not formed has a first uncoated area where a metallic lithium is attached to, and thus electrically connected to, the uncoated area and immersed in the electrolyte, to pre-dope the first and second negative-electrode active-material layers with lithium ions, wherein the first and second negative-electrode active-material layers are pre-doped with lithium ions derived from the metallic lithium.