Abstract: A method for identifying a foil position in a power storage device includes: analyzing the power storage device by X-ray CT analysis to obtain an X-ray absorbed amount at each position; acquiring an on-path X-ray absorbed amount at each on-path position on a specific imaginary line passing through an electrode sheet; and identifying a foil position of an electrode foil through which the specific imaginary line passes, based on the on-path X-ray absorbed amount. The foil position identifying includes fitting to determine an approximate curve that changes to fit a change in the on-path X-ray absorbed amount in a fitting region and generates a single peak in the fitting region, and estimating a foil position of a single electrode foil from the on-path position corresponding to the single peak of the determined approximate curve.

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.

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.

Abstract: Provided is a method for producing a lithium secondary battery in which localized precipitation of a foreign metal in the negative electrode can be reliably suppressed in a shorter time, regardless of, for instance, electrode type or electrode variability. The production method is a method for producing a secondary battery that includes a positive electrode provided with a positive electrode active material layer, a negative electrode provided with a negative electrode active material layer, and a nonaqueous electrolyte. The method comprises a step of constructing a cell including the positive electrode, the negative electrode and the nonaqueous electrolyte; a micro-charging step of performing charging over one hour or longer, up to 0.01% to 0.

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

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.

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: 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 invention is to provide an anode active material capable of enhancing improvement of heat resistance in an all solid secondary battery. The present invention solves the problem by providing an anode active material comprising an active material particle having carbon as a main component, and a coating layer containing LixPOy (2?x?4, 3?y?5) and formed on a surface of the active material particle.

Abstract: An all-solid-state secondary battery system comprising: a sealed battery having formed by housing, in an outer package, a stacked battery; a jig adapted to constrain the sealed battery in the stacking direction; one or more contact pressure sensors provided at least either between an outermost layer surface of the stacked battery and the outer package or in the inside of the stacked battery; one or more gas pressure sensors provided in a space inside the outer package; and a control device adapted to stop charging by judging as an overcharge state only when the change in contact pressure sensed by at least one of the contact pressure sensors is equal to or more than a threshold value, and the change in gas pressure sensed by at least one of the gas pressure sensors is equal to or more than the threshold value.

Abstract: Provided are a secondary battery having a configuration with which localized metal contaminant precipitation at the negative electrode can be reliably inhibited in less time, and a method for producing a secondary battery that allows reliable deactivation of metal contaminant in less time. The battery comprises a positive electrode, a negative electrode, and a separator placed between the two electrodes. The separator has an air resistance Rp?100 sec in an in-plane direction vertical to its thickness direction and an air resistance Rt>Rp in the thickness direction. The method comprises a minimal charging step where the cell is charged to 0.01% to 0.5% capacity over at least one hour to obtain a state of charge where the positive and negative electrode potentials are at or above the oxidation and reduction potentials of a probable metal contaminant, respectively; and a step of performing initial conditioning charging.

Abstract: The main object of the present invention is to provide an all solid state battery in which compatibility between battery performance and safety is intended. The present invention attains the object by providing an all solid state battery comprising a cathode layer containing a cathode active material, an anode layer containing an anode active material, and a solid electrolyte layer formed between the cathode layer and the anode layer, containing a first sulfide solid electrolyte material, characterized in that a ratio of ion resistance of the whole all solid state battery to ion resistance of the solid electrolyte layer is 3.8 or less, and the ion resistance of the solid electrolyte layer is 7.6 ?·cm2 or more and 16 ?·cm2 or less.

Abstract: An all-solid-state secondary battery system comprising: a sealed battery having formed by housing, in an outer package, a stacked battery; a jig adapted to constrain the sealed battery in the stacking direction; one or more contact pressure sensors provided at least either between an outermost layer surface of the stacked battery and the outer package or in the inside of the stacked battery; one or more gas pressure sensors provided in a space inside the outer package; and a control device adapted to stop charging by judging as an overcharge state only when the change in contact pressure sensed by at least one of the contact pressure sensors is equal to or more than a threshold value, and the change in gas pressure sensed by at least one of the gas pressure sensors is equal to or more than the threshold value.

Abstract: A main object of the present invention is to provide an anode active material capable of enhancing improvement of heat resistance in an all solid secondary battery. The present invention solves the problem by providing an anode active material comprising an active material particle having carbon as a main component, and a coating layer containing LixPOy (2?x?4, 3?y?5) and formed on a surface of the active material particle.

Abstract: The main object of the present invention is to provide an all solid state battery in which compatibility between battery performance and safety is intended. The present invention attains the object by providing an all solid state battery comprising a cathode layer containing a cathode active material, an anode layer containing an anode active material, and a solid electrolyte layer formed between the cathode layer and the anode layer, containing a first sulfide solid electrolyte material, characterized in that a ratio of ion resistance of the whole all solid state battery to ion resistance of the solid electrolyte layer is 3.8 or less, and the ion resistance of the solid electrolyte layer is 7.6 ?·cm2 or more and 16 ?·cm2 or less.

Abstract: Provided is a method for producing a lithium secondary cell with which the concentrated precipitation of metal impurities at the negative electrode is inhibited and short circuiting is unlikely to occur. The production method includes, assembling together the positive electrode, the separator, and the negative electrode, and then impregnating the assembly with the nonaqueous electrolyte; charging the assembly within 1 min so that a maximum achieved potential of the positive electrode becomes 3.2 V or more with respect to the redox potential of lithium; allowing the assembly to stand for 10 min or less after the charging has ended; and discharging the assembly within 1 min after the standing step.

Abstract: Provided is a method for manufacturing a lithium secondary battery which is capable of preventing a local deposition of a metallic foreign substance at a negative electrode regardless of the type of a positive electrode and in which a short-circuit is less likely to occur. The present manufacturing method comprises: a step of assembling a cell that includes a positive electrode, a negative electrode, and a nonaqueous electrolyte; a micro charging step of performing a micro charge on the assembled cell before performing an initial conditioning charge until a positive electrode potential with respect to a metal lithium (Li) reference electrode exceeds an Me dissolution potential set in advance at which a mixing-anticipated metal species (Me) starts to dissolve; and an Me dissolution potential holding step of holding the positive electrode potential of the cell at or above the Me dissolution potential for a prescribed period of time after the micro charge.

Abstract: A method of testing a secondary battery includes first to fourth steps. At the first step, the secondary battery after manufacture is charged to a first voltage. At the second step, a second voltage lower than the first voltage is set as a target voltage and discharge or charge is performed in a constant-current constant-voltage mode before the secondary battery is left standing. At the third step, the open circuit voltage of the secondary battery is measured before and after the secondary battery is left standing. At the fourth step, it is determined whether the secondary battery is a conforming item or not based on the difference in the open circuit voltage before and after the secondary battery is left standing.