University of Tokyo

Provided is a receptor comprising a base and a molecular imprinted polymeric film formed on the base and having a space that captures at least a part of a compound having an asymmetric carbon atom. The above-described receptor may comprise a metal layer formed between the base and the molecular imprinted polymeric film and having a nanostructure on a plane in contact with the molecular imprinted polymeric film. In any of the above-described receptor, the molecular imprinted polymeric film may have a noncovalently bonded functional group on a surface in which the space is formed.

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.

The present invention relates to a metal complex obtained by contacting a compound represented by the following general formula [I] or [II] with a transition metal compound containing nickel or palladium as a transition metal belonging to 9th, 10th or 11th group in the periodic table:wherein R¹ to R⁶, E¹, X¹, Z and m in the general formulae [I] and [II] are specifically defined. Further, the present invention relates to a method for producing the metal complex, a catalyst component for olefin polymerization and a catalyst for olefin polymerization, each comprising the metal complex, as well as a method for producing an α-olefin polymer and a method for producing an α-olefin copolymer, each using the metal complex.

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 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.

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.

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