Abstract: The main object of the disclosure is to provide electrode active material Si particles that can inhibit fluctuation in constraining pressure of a battery during charge-discharge. The electrode active material Si particles have clathrate-type Si and diamond-type Si in the same particles. The electrode active material Si particles preferably comprise diamond-type Si at an area % of 0.05 to 11.00 with respect to the entire electrode active material Si particles. Preferably, the clathrate-type Si at least partially has a clathrate type II structure. The electrode active material Si particles preferably have a porous structure.

Abstract: Negative electrode active material particles of the present disclosure are Si particles with pores inside primary particles and having a clathrate type crystalline phase, and satisfying the following relationship: 0.061?V/W. Here, V is a volume of pores having a pore diameter of 10 nm or less and W is a half width of a peak at 2?=31.72°±0.50° in an X-ray diffraction test using CuK?.

Abstract: A slurry is prepared by mixing an active material particle, a binder, and a dispersion medium. The slurry is applied to a surface of a substrate to form a first film. The first film is dried to form a second film. A convex die is pressed against a surface of the second film to form a depressed portion in the surface. After the depressed portion is formed, the second film is dried to form an active material layer. In the second film, a solid phase, a liquid phase, and a gas phase form a pendular state or a funicular state.

Abstract: A method for producing secondary battery electrodes includes a step of preparing a moisture powder formed of aggregated particles that contain a plurality of electrode active material particles, a binder resin, and solvent, wherein the solid phase, liquid phase, and gas phase in at least 50 number % or more of the aggregated particles in the moisture powder form a pendular state or a funicular state; a step of forming a coating film composed of the moisture powder on an electrode current collector, while the gas phase remains present; a step of forming a depression in the coating film by carrying out, using a die having an elevation of prescribed height, depression/elevation transfer into the coating film; and a step of carrying out depression/elevation transfer, using a die having an elevation higher than the elevation of prescribed height, by pressing the higher elevation into the depression that has been formed.

Abstract: An electrode of a secondary battery includes an electrode active material layer containing active material particles. A concave part is formed on the surface of the electrode active material layer. When the electrode active material layer is uniformly divided into three layers, an upper layer, an intermediate layer and a lower layer, in the thickness direction from the surface of the concave part to the electrode current collector, and the electrode densities (g/cm3) of the upper layer, the intermediate layer, and the lower layer are d1, d2, and d3, respectively, they have a relationship of 0.8<(d1/d3)<1.1. The porosity of the electrode active material layer is 10% or more and 50% or less. The area ratio of the concave part is 2% or more and 40% or less. The volume ratio of the concave part is 5% or more and 14% or less.

Abstract: A method of producing an electrode disclosed here includes a step in which a moisture powder formed of agglomerated particles; a step in which a coating film composed of the moisture powder is formed on an electrode current collector by using the moisture powder, with a gas phase of the coating film being remained, so that the average film thickness of the coating film is 50 ?m or more; a step in which the coating film on the electrode current collector is transported, concavo-convex transfer is performed by using a roll mold, and thus a plurality of grooves extending in a direction orthogonal to a transport direction are formed on a surface part of the coating film so that a depth of the groove satisfies (9/10×t1)>t2, and a step in which the coating film formed on the electrode current collector is dried to form an electrode active material layer.

Abstract: An electrode disclosed here includes a surface part of an electrode active material layer has a plurality of first grooves extending in a width direction of the electrode current collector and at least one second groove extending in a longitudinal direction of an electrode current collector. The first groove is formed to be continuous from one end to another end. Here, a region in which the first groove and the second groove are formed is uniformly divided into three layers, which are an upper layer, an intermediate layer and a lower layer, in a thickness direction from the surface of the electrode active material layer to the electrode current collector, and when electrode densities (g/cm3) of the upper layer, the intermediate layer and the lower layer of the groove are d1, d2, and d3, respectively, a relationship of 0.8<(d1/d3)<1.1 is satisfied.

Abstract: Provided is a method for producing an electrode having an electrode active material layer in which the form of both edges is advantageously adjusted. A method for producing an electrode disclosed here is a method for producing an electrode which includes a long sheet-shaped electrode current collector of a positive electrode or a negative electrode; and a long sheet-shaped electrode active material layer formed on the electrode current collector. The method for producing an electrode includes the following steps: an electrode material preparation step for preparing an electrode material; a film formation step for forming a coating film in the sheet longitudinal direction on the electrode current collector using the electrode material; and a roller forming step for adjusting the form of both edge parts in the sheet longitudinal direction of the coating film using a forming roller.

Abstract: A method of producing an electrode disclosed here includes a step in which a moisture powder formed of agglomerated particles; a step in which by using the moisture powder, a coating film composed of the moisture powder is formed on an electrode current collector, with a gas phase of the coating film being remained so that the average film thickness of the coating film is 50 ?m or more; a step in which the coating film on the current collector is transported, concavo-convex transfer is performed using a roll mold, and thus at least one groove extending in the transport direction is formed in a center of a surface part of the coating film, with the groove being formed to have a depth satisfying ( 9/10×t1)>t2; and a step in which the coating film formed on the current collector is dried to form an electrode active material layer.

Abstract: The method for producing a secondary battery electrode disclosed here includes steps of: preparing a moisture powder formed by aggregated particles that contain electrode active material particles, a binder resin, and solvent, wherein a solid phase, liquid phase, and gas phase in at least 50 number % or more of the aggregated particles in the moisture powder form a pendular or funicular state; forming a coating film composed of the moisture powder, on an electrode current collector, while the gas phase remains present; carrying out depression/elevation transfer into a surface part of the coating film; forming an electrode active material layer by drying the coating film; and pressing the electrode active material layer. The electrode active material particles are aspherical particles in which a ratio of a short side to a long side in a cross sectional view is less than 0.95.

Abstract: According to the present disclosure, an electrode having both high energy density and ion diffusivity is provided. The electrode disclosed herein includes an electrode active material layer on either a positive- or negative-electrode current collector, in which the electrode active material layer has a concave/convex shape on its surface in a predetermined pattern at a constant pitch. In a cross-sectional SEM image of the electrode active material layer, linear cracks are unevenly distributed in a concave portion compared to in a convex portion.

Abstract: A method of producing an electrode disclosed here includes a step in which a moisture powder formed of agglomerated particles; a step in which a coating film composed of the moisture powder is formed using the moisture powder on the electrode current collector when a gas phase of the coating film remains; a step in which a concave/convex shape is formed on a surface part of the coating film; a step in which a coating material containing at least one type of inorganic compound is applied to the coating film on which the concave/convex shape is formed; and a step in which the coating film and the coating material are dried, and the electrode having an electrode active material layer and a coating component in a concave part of the concave/convex shape on the electrode active material layer is formed.

Abstract: The electrodes disclosed herein, a low-density region having a relatively low electrode density and a high-density region having a relatively high electrode density are repeated on a surface of the electrode active material layer in a predetermined pattern at a constant pitch. The electrode active material layer is evenly divided into three layers of an upper layer, an intermediate layer, and a lower layer in a thickness direction from the surface of the active material layer to the electrode current collector, and when the electrode densities (g/cm3) of the upper layer, the intermediate layer, and the lower layer of the low-density region are respectively dL1, dL2, and dL3 and the electrode densities (g/cm3) of the upper layer, the intermediate layer, and the lower layer of the high-density region are respectively dH1, dH2, and dH3, a relation of dH3/dL3<dH1/dL1 is satisfied.

Abstract: A method for producing secondary battery electrodes includes a step of preparing a moisture powder formed of aggregated particles that contain a plurality of electrode active material particles, a binder resin, and solvent, wherein the solid phase, liquid phase, and gas phase in at least 50 number % or more of the aggregated particles in the moisture powder form a pendular state or a funicular state; a step of forming a coating film composed of the moisture powder on an electrode current collector, while the gas phase remains present; a step of forming a depression in the coating film by carrying out, using a die having an elevation of prescribed height, depression/elevation transfer into the coating film; and a step of carrying out depression/elevation transfer, using a die having an elevation higher than the elevation of prescribed height, by pressing the higher elevation into the depression that has been formed.

Abstract: A method for producing secondary battery electrodes includes a step of preparing a moisture powder formed of aggregated particles that contain electrode active material particles, a binder resin, and solvent, wherein the solid phase, liquid phase, and gas phase in at least 50 number% of the aggregated particles form a pendular state or a funicular state; a step of forming, using the moisture powder, a coating film while the gas phase remains present; a step of forming a first groove that extends in a first direction, by transferring depressions and elevations, using a first roll die, into the coating film; and a step of forming a second groove that extends in a different direction, by transferring depressions and elevations, using a second roll die, into the coating film. Depression/elevation transfer is carried out in such a manner that the second groove is made deeper than the first groove.

Abstract: In an electrode production apparatus disclosed herein an electrode material supplied between a circumferential surface of a first roll and a circumferential surface of a second roll is transferred to a surface of a separately supplied electrode collector, to thereby form an electrode mix layer on the electrode collector. A predetermined textured shape is formed on the circumferential surfaces of the first roll and of the second roll, the textured shape being formed through repetition of a predetermined relief pattern, at a given pitch, in a running direction. The pitch (smallest repeating unit) and a recess depth of the relief pattern are designed so that the following expression y?0.2x?20 holds, where x (?m) denotes the pitch and y (?m) denotes the recess depth.

Abstract: Provided by the present disclosure is an electrode material (mixture) which exhibits good spreadability and in which the surface area of an electrode active material layer at the stage of a coating film prior to drying can be easily increased by press molding. A moisture powder for forming an electrode active material layer on an electrode current collector of a positive electrode or negative electrode disclosed here is constituted from aggregated particles that contain a plurality of electrode active material particles, a binder resin and a solvent, wherein at least 50% by number or more of the aggregated particles that constitute the moisture powder have the following properties: (1) a solid phase, a liquid phase and a gas phase form a pendular state or a funicular state; and (2) a layer of the solvent is not observed at the outer surface of an aggregated particle in electron microscope observations.

Abstract: A main object of the present disclosure is to provide a stacked battery in which an unevenness of short circuit resistance among a plurality of cells is suppressed. The present disclosure achieves the object by providing a stacked battery comprising: a plurality of cells in a thickness direction, wherein the plurality of cells are electrically connected in parallel; each of the plurality of cells includes a cathode current collector, a cathode active material layer, a solid electrolyte layer, an anode active material layer, and an anode current collector, in this order; the stacked battery includes a surface-side cell that is located on a surface side of the stacked battery, and a center-side cell that is located on a center side rather than the surface-side cell; and a contact resistance between the cathode current collector and the anode current collector in the surface-side cell is more than a contact resistance between the cathode current collector and the anode current collector in the center-side cell.

Abstract: A main object of the present disclosure is to provide a stacked battery in which the unevenness of short circuit resistance among a plurality of cells is suppressed.

Abstract: An objective of the present disclosure is to provide a stacked battery that suppresses sneak current caused by an unevenness of a short circuit resistance among a plurality of cells. The present disclosure provides a stacked battery comprising: a plurality of cells in a thickness direction, wherein the plurality of cells are electrically connected in parallel; the stacked battery includes a surface-side cell that is located on a surface side of the stacked battery, and a center-side cell that is located on a center side rather than the surface-side cell; wherein a resistance of the cathode current collecting tab in the surface-side cell is more than a resistance of the cathode current collecting tab in the center-side cell; or a resistance of the anode current collecting tab in the surface-side cell is more than a resistance of the anode current collecting tab in the center-side cell.