Electric storage device
View Patent ↗An electric storage device 10 has an electrode laminate unit 12 including positive electrodes 14 , negative electrodes 15 and a lithium electrode 16 provided at the outermost part of the electrode laminate unit 12 . The lithium electrode 16 has a lithium-electrode current collector 26 welded to a negative-electrode current collector 22 and a lithium unit 27 sandwiched between the lithium-electrode current collector 26 and the negative electrode 15 . The lithium unit 27 is composed of a lithium holding plate 27 a that is in contact with the lithium-electrode current collector 26 , and a lithium ion source 27 b that is provided to the lithium holding plate 27 a . The lithium ion source 27 b is not mounted on the lithium-electrode current collector 26 , but only the lithium-electrode current collector 26 is laminated and welded, whereby the damage of the lithium ion source 27 b is prevented, and the manufacturing operation is simplified.
1. 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.
2. An electric storage device according to claim 1 , wherein
the second conductor is arranged between the first conductor and the positive-electrode or the negative electrode opposite to the first conductor.
3. An electric storage device according to claim 1 , wherein
the positive-electrode current collector and the negative-electrode current collector have through-holes formed therethrough.
4. An electric storage device according to claim 1 , wherein
the ion source is metal lithium.
5. An electric storage device according to claim 1 , wherein
the first conductor and the second conductor are made of the same material.
6. An electric storage device according to claim 1 , wherein the first conductor and the second conductor are made of the same material as that of the positive-electrode current collector or the negative-electrode current collector into which the ions are doped.
7. An electric storage device according to claim 1 , wherein
the first conductor has an indented surface.
8. An electric storage device according to claim 1 , wherein
the first conductor is rectangular or square.
9. An electric storage device according to claim 1 , wherein
a potential of the positive electrode when the positive electrode and the negative electrode are short-circuited is 2.0 V or less (vs. Li/Li + ).
10. An electric storage device according to claim 1 , wherein
a negative-electrode active material contained in the negative-electrode mixture layer has a capacitance per a negative-electrode active material weight three times or more larger than a capacitance of a positive-electrode active material per a positive-electrode active material weight contained in the positive-electrode mixture layer, and the positive-electrode active material weight is larger than the negative-electrode active material weight.