Abstract: An electrochemical device includes a first electrode unit; a second electrode unit; a third electrode unit; a first lithium ion supply source, which is disposed between the first electrode unit and the third electrode unit and includes a first current collector that is a porous metal foil having a first main surface on the side of the first electrode unit; a second lithium ion supply source, which is disposed between the second electrode unit and the third electrode unit and includes a second current collector that is a porous metal foil having a third main surface on the side of the second electrode unit; and an electrolyte. Lithium ions are pre-doped from first metal lithium attached to the first main surface, and second metal lithium attached to the third main surface, into the negative electrode of each electrode unit.

Abstract: In an electric storage element, a negative electrode has a negative-electrode collector and a negative-electrode active material layer provided on a principal face of the negative-electrode collector, the positive electrode having a positive-electrode collector and a positive-electrode active material layer provided on a principal face of the positive-electrode collector, and the separator insulating the negative electrode and the positive electrode, are stacked and wound together. A negative-electrode terminal and a positive-electrode terminal are electrically connected to the negative-electrode collector and the positive-electrode collector, respectively, and projects from a winding structure along a direction of a center axis of winding. A first protective tape covers the negative-electrode terminal and has lower ion permeability than that of the separator.

Abstract: An electrochemical device has a positive electrode, a negative electrode, separators, and an electrolyte. The negative electrode has a first and second negative-electrode active-material layers and a negative-electrode collector which has (i) a first principal face on which the first negative-electrode active-material layer is formed, and (ii) a second principal face having a coated area where the second negative-electrode active-material layer is formed, and an uncoated area where no second negative-electrode active-material layer is formed. The negative-electrode collector has multiple through holes that interconnect the first and second principal faces wherein the boundary of the coated area and the uncoated area intersects the opening of at least one of the multiple through holes.

Abstract: In an embodiment, an electrochemical device includes a winding structure which has a negative electrode, a positive electrode, and separators stacked and wound together; a negative-electrode terminal; a positive-electrode terminal; a first protective tape which covers the negative-electrode terminal and a negative-electrode active material layer; a second protective tape which covers the positive-electrode terminal and a positive-electrode active material layer; and electrolyte, wherein the positive-electrode terminal is separated from the negative-electrode terminal by a first distance. The width corresponding to the sum of a first width of the first protective tape along a winding direction of the winding structure, and a second width of the second protective tape along the winding direction, is smaller than a value obtained by multiplying the first distance by pi.

Abstract: An electrochemical device is constituted by a positive electrode, a negative electrode, and separators that are wound in such a way that the first principal face of the negative electrode and third principal face of the positive electrode are on the inner side of winding, while the second principal face of the negative electrode and fourth principal face of the positive electrode are on the outer side of winding, with the separators separating the positive electrode and negative electrode; wherein the second principal face has a first region opposed to the positive electrode via the separator and a second region on the outermost side of winding and not opposed to the positive electrode, the second region includes a first uncoated region where no negative electrode active material layer is formed, and a metal lithium is joined to the first uncoated region and immersed in electrolytic solution.

Abstract: An electrochemical device includes: 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 a negative-electrode active material layer formed on the negative-electrode collector; separators placed between the positive electrode and the negative electrode; and an electrolyte immersing the positive electrode, negative electrode, and separators. Metallic lithium is joined to a lithium-electrode collector, and the lithium-electrode collector is placed in a manner contacting the negative-electrode active material layer, and immersed in the electrolyte, so that the negative-electrode active material is pre-doped with lithium ions. The electrochemical device can offer high capacitance and excellent productivity.

Abstract: An electrochemical device includes: an exterior can formed of metal containing a first metal type; an electricity storage device that includes a positive electrode, a negative electrode, and a separator, the positive electrode and the negative electrode being stacked via the separator and wound, the electricity storage device further including a lead plate that is electrically connected to one of the positive electrode and the negative electrode, contains a second metal type different from the first metal type, and is formed of metal different from that of the exterior can, the electricity storage device being housed in the exterior can; and a reinforcement plate formed of metal containing the first metal type, the exterior can and the reinforcement plate being welded with the lead plate being sandwiched therebetween, the first metal type and the second metal type coexisting at a welding portion thereof.

Abstract: An electrochemical device includes a first electrode unit; a second electrode unit; a third electrode unit; a first lithium ion supply source, which is disposed between the first electrode unit and the third electrode unit and includes a first current collector that is a porous metal foil having a first main surface on the side of the first electrode unit; a second lithium ion supply source, which is disposed between the second electrode unit and the third electrode unit and includes a second current collector that is a porous metal foil having a third main surface on the side of the second electrode unit; and an electrolyte. Lithium ions are pre-doped from first metal lithium attached to the first main surface, and second metal lithium attached to the third main surface, into the negative electrode of each electrode unit.

Abstract: An electrochemical device has a positive electrode, a negative electrode, separators, and an electrolyte. The negative electrode has: a negative-electrode collector having a first principal face and a second principal face on the 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 whose density of negative-electrode active material is lower than that of the first negative-electrode active-material layer. In the electrolyte, the positive electrode, negative electrode, and separators are immersed. The electrochemical device is such that the first and second negative-electrode active-material layers are pre-doped with lithium ions as a metallic lithium is electrically connected to the second principal face where the second negative-electrode active-material layer is not formed, and then immersed in the electrolyte.

Abstract: An electrochemical device includes a positive electrode, a negative electrode, and separators which are stacked and wound together, and electrolytic solution. A negative-electrode terminal is provided which is made of metal, and has a joining part which is a part joined to the principal face of the negative-electrode collector. The negative electrode has a first width, the positive electrode has a second width, which is smaller than the first width, and the separators have a third width, which is greater than the first width, along the direction parallel with the center axis of winding. The length of the joining part along the direction parallel with the center axis of winding is equal to or greater than the second width, but equal to or smaller than the third width.

Abstract: An electrochemical device is constituted by a positive electrode, a negative electrode, and separators that are wound in such a way that the first principal face of the negative electrode and third principal face of the positive electrode are on the inner side of winding, while the second principal face of the negative electrode and fourth principal face of the positive electrode are on the outer side of winding, with the separators separating the positive electrode and negative electrode; wherein the second principal face has a first region opposed to the positive electrode via the separator and a second region on the outermost side of winding and not opposed to the positive electrode, the second region includes a first uncoated region where no negative electrode active material layer is formed, and a metal lithium is joined to the first uncoated region and immersed in electrolytic solution.

Abstract: An electrochemical device is constituted by a positive electrode, a negative electrode, and separators that are wound in such a way that the first principal face of the negative electrode and third principal face of the positive electrode are on the inner side of winding, while the second principal face of the negative electrode and fourth principal face of the positive electrode are on the outer side of winding, with the separators separating the positive electrode and negative electrode; wherein the second principal face has a first region opposed to the positive electrode via the separator and a second region on the outermost side of winding and not opposed to the positive electrode, the second region includes a first uncoated region where no negative electrode active material layer is formed, and a metal lithium is joined to the first uncoated region and immersed in electrolytic solution.

Abstract: In an embodiment, an electric storage device 1 includes: an electric storage element 50 having a positive electrode and a negative electrode; a non-aqueous electrolytic solution constituted by a non-aqueous solvent primarily containing cyclic ester and cyclic carbonate ester, in which an electrolyte containing lithium salt is dissolved and to which a sulfonate ester derivative whose reduction potential is higher than that of the cyclic ester and cyclic carbonate ester is added; and an outer container 70 that stores the electric storage element 50 and non-aqueous electrolytic solution. The electric storage device can offer both good low-temperature characteristics and good high-temperature reliability.

Abstract: An electrochemical device has a positive electrode, a negative electrode, separators, and an electrolyte. The negative electrode has a first and second negative-electrode active-material layers and a negative-electrode collector which has (i) a first principal face on which the first negative-electrode active-material layer is formed, and (ii) a second principal face having a coated area where the second negative-electrode active-material layer is formed, and an uncoated area where no second negative-electrode active-material layer is formed. The negative-electrode collector has multiple through holes that interconnect the first and second principal faces wherein the boundary of the coated area and the uncoated area intersects the opening of at least one of the multiple through holes.

Abstract: An electrochemical device has a positive electrode, a negative electrode, separators, and an electrolyte. The negative electrode has: a negative-electrode collector having a first principal face and a second principal face on the 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 whose density of negative-electrode active material is lower than that of the first negative-electrode active-material layer. In the electrolyte, the positive electrode, negative electrode, and separators are immersed. The electrochemical device is such that the first and second negative-electrode active-material layers are pre-doped with lithium ions as a metallic lithium is electrically connected to the second principal face where the second negative-electrode active-material layer is not formed, and then immersed in the electrolyte.

Abstract: An electrochemical device includes multiple electrode bodies and electrolyte. Each electrode body includes: an electrode unit constituted by positive electrodes and negative electrodes that are stacked together alternately with separators in between; a first lithium ion pre-doping supply source which includes a first current collector being a metal foil having no through holes; and a second lithium ion pre-doping supply source which sandwiches the electrode unit together with the first lithium ion supply source, and which includes a second current collector being a metal foil having no though holes. The multiple electrode bodies are stacked in a manner attaching the first current collector of one electrode body to the second current collector of another electrode body. The negative electrodes provided in each electrode unit are pre-doped with lithium ions derived from the first lithium ion pre-doping supply source and the second lithium ion pre-doping supply source.

Abstract: In an electric storage element, a negative electrode has a negative-electrode collector and a negative-electrode active material layer provided on a principal face of the negative-electrode collector, the positive electrode having a positive-electrode collector and a positive-electrode active material layer provided on a principal face of the positive-electrode collector, and the separator insulating the negative electrode and the positive electrode, are stacked and wound together. A negative-electrode terminal and a positive-electrode terminal are electrically connected to the negative-electrode collector and the positive-electrode collector, respectively, and projects from a winding structure along a direction of a center axis of winding. A first protective tape covers the negative-electrode terminal and has lower ion permeability than that of the separator.

Abstract: An electrochemical device includes: 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 a negative-electrode active material layer formed on the negative-electrode collector; separators placed between the positive electrode and the negative electrode; and an electrolyte immersing the positive electrode, negative electrode, and separators. Metallic lithium is joined to a lithium-electrode collector, and the lithium-electrode collector is placed in a manner contacting the negative-electrode active material layer, and immersed in the electrolyte, so that the negative-electrode active material is pre-doped with lithium ions. The electrochemical device can offer high capacitance and excellent productivity.

Abstract: In an embodiment, an electrochemical device includes a winding structure which has a negative electrode, a positive electrode, and separators stacked and wound together; a negative-electrode terminal; a positive-electrode terminal; a first protective tape which covers the negative-electrode terminal and a negative-electrode active material layer; a second protective tape which covers the positive-electrode terminal and a positive-electrode active material layer; and electrolyte, wherein the positive-electrode terminal is separated from the negative-electrode terminal by a first distance. The width corresponding to the sum of a first width of the first protective tape along a winding direction of the winding structure, and a second width of the second protective tape along the winding direction, is smaller than a value obtained by multiplying the first distance by pi.

Abstract: An electrochemical device has a positive electrode, a negative electrode, a negative-electrode terminal, separators, and electrolytic solution, where the positive electrode, negative electrode, and separators are stacked and wound together. The negative-electrode terminal is made of metal, and has a joining part which is a part joined to the principal face of the negative-electrode collector. A protective tape is made of insulating material and attached to the negative electrode to cover the joining part. The negative electrode has a first width along the direction parallel with the axis of winding. The positive electrode has a second width, which is smaller than the first width, along the direction parallel with the axis of winding. The length of the protective tape along the direction parallel with the axis of winding is equal to or greater than the second width.