Prime Planet Energy & Solutions

The present disclosure provides a positive plate, and a method for collecting positive electrode materials included in the positive plate. The positive plate disclosed herein includes an electrode sheet and a positive electrode mixture layer containing a positive electrode active material, in which a water-soluble adhesive layer containing a water-soluble binder and a conductive material is interposed between the electrode sheet and the positive electrode mixture layer.

The present disclosure provides a method for producing a precursor of a positive electrode active material that makes it possible to decrease waste generation. The method for producing a precursor of a positive electrode active material according to the present disclosure, includes: a step of bringing a raw material containing Ni and Co into contact with an aqueous phase containing ammonia and ammonium sulfate to leach Ni and Co into the aqueous phase; a step of removing and recovering ammonia from the aqueous phase; a step of dissolving a manganese salt in the aqueous phase from which ammonia has been removed; and a step of obtaining a carbonate salt containing Ni, Co, and Mn by crystallization with ammonium bicarbonate from the aqueous phase in which the manganese salt has been dissolved.

A power storage device (3) includes a first electrode assembly (81), a second electrode assembly (91), and a housing case (20). The housing case (20) includes a first end plate (22a) and a second end plate (21aa) on which an exhaust valve (21ab) is formed, The first electrode assembly (81) and the second electrode assembly (91) are disposed such that a first winding axis (α1) and a second winding axis (α2) pass through the first end plate (22a) and the second end plate (21aa). The first electrode assembly (81) has a first hollow portion (S1) formed therein. The second electrode assembly (91) has a second hollow portion (S2). When the exhaust valve (21ab) is viewed in plan view from an axial direction, the exhaust valve (21ab) is disposed so as to be away from at least one of a first hollow portion (S1) and a second hollow portion (S2).

A method of estimating a salt concentration in an electrolyte solution of a secondary battery (1) includes: a capacity acquiring step S1 of acquiring a capacity of a secondary battery (1) that is to be an estimation object; a discharging time acquiring step S2 of acquiring a discharging time when the secondary battery (1) is discharged under a predetermined condition; and a salt concentration estimating step S3 of estimating the salt concentration in the electrolyte solution of the secondary battery (1) based on the acquired capacity of the secondary battery (1), the acquired discharging time, and a table recording a relationship between the capacity, the discharging time, and the salt concentration in the electrolyte solution of the secondary battery (1), related to the secondary battery (1) that is to be the estimation object.

The power storage device (2A) includes an electrode assembly (101), a housing case (20) that houses the electrode assembly (101), and an exhaust valve (21ab) formed on the housing case (20). The housing case (20) includes a first end plate (22), a second end plate (21a), and a peripheral wall (21b) provided between the first end plate (22) and the second end plate (21a). A portion of the peripheral wall (21b) on the side of the second end plate (21a) is thinner than a portion thereof on the side of the first end plate (22). The exhaust valve (21ab) is formed on the second end plate (21a).

The present invention provides a novel method capable of recovering Ni and Co as well as Cu from a battery waste containing Ni, Co, and Cu with a high recovery ratio, in which a leaching agent is suitable for reuse. The method for reproducing valuable metals according to the present disclosure includes: a Cu leaching step of leaching Cu, using an ammonia water, from battery waste containing Ni, Co, and Cu into the ammonia water; and an Ni and Co leaching step of leaching Ni and Co, using an ammonia aqueous solution containing ammonia and at least one inorganic ammonium salt selected from a group consisting of ammonium sulfate and ammonium carbonate, from a solid residue obtained in the Cu leaching step into the ammonia aqueous solution.

The present invention provides a novel method that makes it possible to efficiently separate Cu from battery waste containing Ni, Co, and Cu. A method for reproducing valuable metals according to the present disclosure includes: a step of roasting waste of a lithium ion secondary battery to obtain a roasted product; and a step of leaching Cu from the roasted product using an ammonia water. The waste contains Ni, Co, and Cu. The roasting is performed such that the roasted product contains Ni and Co in an oxide form and Cu in a metal form.

The present invention provides a novel method capable of recovering Ni and Co from a battery waste containing Ni and Co while adjusting an Ni/Co ratio. The method for reproducing the positive electrode material according to the present disclosure includes a step of leaching Ni and Co, using an ammonia aqueous solution containing ammonia and ammonium sulfate, from a battery waste containing Ni and Co into the ammonia aqueous solution. Herein, oxygen is fed to the ammonia aqueous solution in the leaching.

An aspect of a fabrication method disclosed here includes a preparation step S1 of preparing a battery assembly (2) and an injection step S2 of injecting an electrolyte (E) into the battery assembly (2). In the injection step S2, the electrolyte (E) is injected from a liquid inlet (120A) inserted into an injection hole (22) in a state where the battery assembly (2) is placed with a sealing plate (20A) having the injection hole (22) facing upward.

A method of manufacturing a power storage device includes: after producing an electrode assembly (200), joining a first electrode tab group (250, 280) to a first conductive member (420), and attaching an insulating member (460) to the first conductive member (420); after attaching the insulating member (460) to the first conductive member (420), inserting the electrode assembly (200) into a case main body (110) from a first end portion side of the electrode assembly (200) through a second opening (113); after inserting the electrode assembly (200) into the case main body (110), electrically connecting a first electrode terminal (302) provided on a first sealing plate (130), and the first conductive member (420); and after electrically connecting the first electrode terminal (302) and the first conductive member (420), sealing a first opening (114) by the first sealing plate (130).