Electric storage device

An electric storage device comprising:

• a positive electrode including a positive-electrode current collector and a positive-electrode mixture layer mounted on the positive-electrode current collector;
• and
• a negative electrode including a negative-electrode current collector and a negative-electrode mixture layer mounted on the negative-electrode current collector,
• the electric storage device further including:
• a first conductor connected to the positive-electrode current collector or the negative-electrode current collector;
• and
• a second conductor detachably mounted on the first conductor and holding an ion source adhered thereon, wherein
• the first conductor is first connected to the positive-electrode current collector or the negative-electrode current collector, and the second conductor is then connected to the positive-electrode current collector or the negative-electrode current collector through the first conductor so as to dope ions from the ion source into the positive-electrode mixture layer or the negative-electrode mixture layer.