Search

KR-20260068121-A - METHOD FOR MANUFACTURING ACTIVE MATERIAL

KR20260068121AKR 20260068121 AKR20260068121 AKR 20260068121AKR-20260068121-A

Abstract

A method for manufacturing an active material comprising the following process. (1) A process of mixing an activating agent containing one or more alkali metal compounds into an electrode composite including an active material and a binder. (2) A process of heating the obtained mixture to a temperature above the melting start temperature of the activating agent under an atmosphere having an oxygen partial pressure of 0.3 atm or more. (3) Process for recovering active material from the mixture after heating

Inventors

  • 시마노 사토시

Assignees

  • 스미또모 가가꾸 가부시끼가이샤

Dates

Publication Date
20260513
Application Date
20210303
Priority Date
20200306

Claims (12)

  1. A method for manufacturing an active material comprising the following process. (1) A process of mixing an activating agent containing one or more alkali metal compounds into an electrode composite including an active material and a binder. (2) A process of heating the obtained mixture to a temperature above the melting start temperature of the activating agent under an atmosphere having an oxygen partial pressure of 0.3 atm or more. (3) Process for recovering active material from the mixture after heating
  2. In Article 1, A method for manufacturing an active material in which the above active material is a positive electrode active material.
  3. In Article 2, A method for manufacturing an active material in which the above positive electrode active material is a positive electrode active material of a non-water secondary battery.
  4. In any one of paragraphs 1 to 3, A method for manufacturing an active material in which the above active material is a complex oxide containing one or more elements selected from element group 1 and one or more elements selected from element group 2. Group 1 of elements: Ni, Co, Mn, Fe, Al, and P Group 2: Li, Na, K, Ca, Sr, Ba, and Mg
  5. In any one of paragraphs 1 to 4, A method for manufacturing an active material in which the above active material is a complex oxide represented as Li 1+a M 2 b M 1 M T c O 2+d X e . However, M₂ represents at least one element selected from the group consisting of Na, K, Ca, Sr, Ba, and Mg, and M1 represents at least one element selected from the group consisting of Ni, Co, Mn, Fe, Al, and P, and M T represents at least one element selected from the group consisting of transition metal elements other than Ni, Co, Mn, and Fe, and X represents at least one element selected from the group consisting of non-metallic elements excluding oxygen O and P, and -0.4 < a < 1.5, 0 ≤ b < 0.5, 0 ≤ c < 0.5, -0.5 < d < 1.5, and 0 ≤ e < 0.5 are satisfied.
  6. In Article 5, A method for manufacturing an active material in which the mole fraction of Ni included in M1 in the above-mentioned composite oxide is 0.5 or higher.
  7. In any one of paragraphs 4 through 6, A method for manufacturing an active material in which the above-mentioned composite oxide has a hexagonal crystal structure.
  8. In any one of paragraphs 1 to 7, A method for manufacturing an active material having a discharge capacity of 150 mAh/g or more of the recovered active material.
  9. In any one of paragraphs 1 through 8, A method for manufacturing an active material, wherein at least one alkali metal compound included in the above-mentioned activating agent comprises an alkali metal element identical to the alkali metal element contained in the above-mentioned active material.
  10. In any one of paragraphs 1 through 9, A method for manufacturing an active material in which at least one of the alkali metal compounds contained in the above-mentioned activating agent is an alkali metal compound that exhibits alkalinity when dissolved in water.
  11. In Article 10, A method for manufacturing an active material wherein the alkali metal compound exhibiting alkalinity when dissolved in the above water is one or more selected from the group consisting of alkali metal hydroxides, carbonates, bicarbonates, oxides, peroxides, and superoxides.
  12. In any one of paragraphs 1 to 11, A method for manufacturing an active material, wherein the melting initiation temperature of the above-mentioned activating agent is 700 ℃ or lower.

Description

Method for manufacturing active material The present invention relates to a method for manufacturing an active material. Active materials of batteries contain rare metal components such as cobalt, nickel, manganese, and lithium, and in particular, compounds with the above rare metal components as the main component are used as positive electrode active materials for non-aqueous electrolyte secondary batteries. In order to conserve resources of rare metal components, a method is required to regenerate rare metal components from waste materials of secondary batteries. For example, Patent Document 1 discloses a method of mixing an electrode composite with an activating agent containing an alkali metal compound, heating the mixture to decompose the binder, and removing the decomposition product or the activating agent with water or the like to recover the active material. This method is cost-effective in that it does not use organic solvents and directly recovers the active material from waste batteries. Hereinafter, embodiments of the present invention will be described. A method for manufacturing an active material related to an embodiment of the present invention comprises the following process. (1) A process of mixing an activating agent containing one or more alkali metal compounds into an electrode composite including an active material and a binder. (2) A process of heating the obtained mixture to a temperature higher than the melting start temperature of the activating agent in an atmosphere where the oxygen partial pressure is 0.3 atm or higher. (3) Process for recovering active material from the mixture after heating Hereinafter, each process in the method for recovering active material from battery waste according to the present invention will be described in detail. Process (1): Process of mixing an activating agent into the electrode composite. First, prepare the electrode composite material. <Electrode Composite> The electrode composite is a material comprising an active material and a binder, wherein the active material is bound to each other by the binder. The electrode composite may also include a conductive material, in which case the active material and the conductive material are bound to each other by the binder. <Active Substance> The active material may be a positive electrode active material or a negative electrode active material. Examples of positive electrode active materials are complex compounds composed of constituent elements such as lithium, oxygen, fluorine, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, potassium, calcium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, yttrium, niobium, molybdenum, silver, indium, tungsten, etc. Also, examples of negative electrode active materials are complex compounds composed of constituent elements such as lithium, oxygen, fluorine, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, potassium, calcium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, yttrium, niobium, molybdenum, silver, indium, tungsten, etc. In addition, the active material may consist of a single compound or may be composed of multiple compounds. Examples of suitable positive electrode active materials are complex compounds composed of constituent elements such as lithium, oxygen, sodium, potassium, calcium, magnesium, aluminum, phosphorus, sulfur, vanadium, manganese, iron, nickel, copper, cobalt, gallium, molybdenum, indium, tungsten, etc. In addition, the active material in the present invention is preferably a positive electrode active material for a non-aqueous secondary battery. An example of a positive electrode active material for a non-aqueous secondary battery is a composite oxide containing one or more elements selected from the following element group 1 and one or more metals selected from element group 2. Group 1 of elements: Ni, Co, Mn, Fe, Al, and P Group 2: Li, Na, K, Ca, Sr, Ba, and Mg Among these, a lithium transition metal composite oxide in which element group 1 is one or more selected from Ni, Co, Mn, Fe, and P, and element group 2 is Li, or a sodium transition metal composite oxide in which element group 2 is Na is preferred, and in particular, a lithium transition metal composite oxide is preferred. Specifically, examples of lithium transition metal composite oxides include LiCoO2 , LiNiO2 , Li(Ni,Co) O2 , Li(Ni,Co,Al)O2, Li(Ni,Mn)O2, Li(Ni,Mn,Co)O2, LiMn2O4, Li(Mn,Fe)2O4 , Li2MnO3 , Li2NiO3 , Li2 ( Ni ,Mn ) O3 , LiFePO4 , LiMnPO4, etc. , and these can be used in combination of one or more types. As sodium transition metal complex oxides, specifically, examples include NaCoO2 , NaNiO2 , Na(Ni,Co) O2 , Na(Ni,Mn) O2 , Na(Ni,Mn,Co) O2 , Na( Fe ,Ni,Mn) O2 , NaMn2O4 , Na(Mn,Fe) 2O4 , NaFePO4 , NaMnPO4 , etc. , and one or more of these can be used. In particular, it is desirable for the complex oxide to be represented as Li 1+a M 2 b M 1 M T c O 2+d X e (Equatio