Ngk Insulators, Inc.

Junki Matsuya

Yasushi Kato

Takahiro Kondo

Kenshin Kitoh

Takeshi Yagi

Yuichi Gonda

Makoto Teranishi

Takahiro Honda

There is provided a secondary zinc battery including: a unit cell including; a positive-electrode plate including a positive-electrode active material layer and a positive-electrode collector; a negative-electrode plate including a negative-electrode active material layer containing zinc and a negative-electrode collector; a layered double hydroxide (LDH) separator covering or wrapping around the entire negative-electrode active material layer; and an electrolytic solution. The positive-electrode collector has a positive-electrode collector tab extending from one edge of the positive-electrode active material layer, and the negative-electrode collector has a negative-electrode collector tab extending from the opposite edge of the negative-electrode active material layer and beyond a vertical edge of the LDH separator. The unit cell can thereby collects electricity from the positive-electrode collector tab and the negative-electrode collector tab. The LDH separator has at least two continuous closed edges, provided that an edge, adjacent to the negative-electrode collector tab, of the LDH separator is open.

Zinc secondary battery

A honeycomb structure includes a honeycomb structure body having porous partition walls, wherein a value of a porosity of the partition wall in a partitioning wall portion between the two cells is defined as a porosity A, a value of a porosity of the partition wall in an intersecting portion that is a region connecting two or more wall portions is defined as a porosity B, a value of A/B obtained by dividing the porosity A by the porosity B is from 0.5 to 0.95, and the porosity A is from 10 to 40%.

Honeycomb structure

There is provided a secondary zinc battery including: (a) at least one unit cell including; a positive electrode; a negative-electrode structure including a negative-electrode active material layer containing at least one selected from the group consisting of elemental zinc, zinc oxide, zinc alloys, and zinc compounds; a LDH separator including a porous substrate composed of a polymeric material and layered double hydroxide (LDH); and an electrolytic solution; and (b) a pressuring unit compacting the unit cell to bring the negative-electrode structure in close contact with the LDH separator. Pores of the porous substrate are filled with the LDH such that the LDH separator is hydroxide-ion-conductive and gas-impermeable. The LDH separator separates the positive electrode from the negative-electrode active material layer.

Provided is a positive electrode structure for a secondary battery. This positive electrode structure includes: a positive electrode current collector composed of a tabular nickel foam and having a tabular coated portion and an uncoated portion extending from an outer peripheral portion of the coated portion; and a positive electrode active material containing nickel hydroxide and/or nickel oxyhydroxide incorporated into the coated portion of the positive electrode current collector. The positive electrode active material is not present in the uncoated portion of the positive electrode current collector, and the nickel foam constituting the uncoated portion is compressed so as to have a thickness of 0.10 times or more and less than 0.8 times a thickness of the nickel foam constituting the coated portion.

Positive electrode structure for secondary battery

Provided is a positive electrode structure including: a positive electrode current collector composed of a tabular nickel foam and having a tabular coated portion and an uncoated portion extending from an outer peripheral portion of the coated portion; a positive electrode active material containing nickel hydroxide and/or nickel oxyhydroxide incorporated into the coated portion of the positive electrode current collector; and a nonwoven fabric made of a polymer material and covering the coated portion of the positive electrode current collector from both sides. The positive electrode active material is not present in the uncoated portion of the positive electrode current collector. The nonwoven fabric covers an entirety of the coated portion and extends from the outer peripheral portion of the coated portion to form a surplus region, and the surplus region is sealed so as to close all around the outer peripheral portion of the coated portion.

Positive electrode structure for secondary cell

A honeycomb filter includes a honeycomb structure body having porous partition walls arranged to surround cells, in a cross section of the honeycomb structure body which is perpendicular to an extending direction of the cells, a value of a porosity of the partition wall in a partitioning region between the inflow cell and the outflow cell is defined as a porosity A, among intersecting portions where partitioning regions of the partition walls between the cells intersect one another, a value of a porosity of the partition wall in an intersecting portion between the two inflow cells is defined as a porosity B, and a value of A/B obtained by dividing the porosity A by the porosity B is from 0.50 to 0.95.

Honeycomb filter

The honeycomb structure body has a dense part at a part in axial direction including a center region of the inflow end face, the dense part having a change ratio of porosity calculated by the following Expression (1) that is 2 to 8%, and has an outside-diameter increasing part, and the honeycomb structure body has a change ratio of average diameter calculated by the following Expression (2) that is 0.2 to 3%,(1&#x2212;Px/Py)&#xd7;100, &#x2003;&#x2003;Expression (1):

The honeycomb structure body has a dense part having a change ratio of porosity calculated by the following Expression (1) that is 1 to 5%. The honeycomb structure body also has an outside-diameter decreasing part in which the outside diameter decreases from the inflow end face to the outflow end face. The honeycomb structure body has a change ratio of average diameter calculated by the following Expression (2) that is 0.2 to 3%.(1&#x2212;)&#xd7;100,&#x2003;&#x2003;Expression (1):

A honeycomb structure having a quadrangular or triangular cross-sectional shape of cells and having specific open cells in which open changing portions are present only in a range of 20 mm or less from the first end face, and the open changing portion satisfies relations of 1&#x2264;|(1&#x2212;(D/D))&#xd7;100|&#x2264;80 and 1&#x2264;|(1&#x2212;(D/D))&#xd7;100|&#x2264;80. Dindicates a diameter of an inscribed circle which comes in contact with a peripheral edge of the open end of the cell in the first end face. Dindicates a diameter of the inscribed circle which comes in contact with the peripheral edge of the open end of the cell in the second end face. Dindicates a diameter of an inscribed circle which comes in contact with a peripheral edge of the cell in a cross section perpendicular to a direction from the first end face toward the second end face.

A honeycomb structure having a hexagonal cross-sectional shape of cells and having specific open cells in which open changing portions are present only in a range of 30 mm or less from the first end face, and the open changing portion satisfies relations of 1&#x2264;|(1&#x2212;(D/D))&#xd7;100|&#x2264;70 and 1&#x2264;|(1&#x2212;(D/D))&#xd7;100|&#x2264;70. Dindicates a diameter of an inscribed circle which comes in contact with a peripheral edge of the open end of the cell in the first end face. Dindicates a diameter of the inscribed circle which comes in contact with the peripheral edge of the open end of the cell in the second end face. Dindicates a diameter of an inscribed circle which comes in contact with a peripheral edge of the cell in a cross section perpendicular to a direction from the first end face toward the second end face.

The honeycomb structure includes a honeycomb structure body having porous partition walls, and a plugging portion disposed in one of open ends of each cell, a thickness of the partition walls is 0.30 mm or more and 0.51 mm or less, a cell density is 30 cells/cmor more and 93 cells/cmor less, a filtration area (cm) of inflow cells included per cmof the honeycomb structure body is defined as an inflow side filtration area G (cm/cm), a value obtained by dividing a pore volume Vp (cm) formed in the partition walls by a total volume Va (L) including the cells is defined as a pore volume ratio A (cm/L), and in this case, a product of the inflow side filtration area G (cm/cm) and the pore volume ratio A (cm/L) is 1800 cm/L or more and 3200 cm/L or less.

Growing community of inventors

Nagoya, Japan

Junki Matsuya