Method for manufacturing electrode active material

Abstract

The present invention provides particulate cathode active material, cathode, and battery that achieve high energy density. [Solution] A general formula Li containing secondary particles which are aggregates from primary particles. 1+x (M 2 y TM 1-y ) (1-x) A particulate cathode active material made of O2, wherein TM is Ni, or TM contains Ni and at least one of Mn and Co, x is in the range of 0 to 0.2, y is in the range of 0.001 to 0.01, M 2 However, particulate cathode active materials are provided, which are selected from Zr, Nb, and Ta, and are concentrated on the crystallite surface of primary particles, or otherwise uniformly distributed within such cathode active materials.

Claims

1. The following steps: (a) A step of providing an (oxy) hydroxide or oxide of TM, wherein TM is Ni or a combination of metals, and TM contains Ni and at least one of Mn and Co. (b) The oxide or (oxy) hydroxide from step (a) is M ２ A step of treating with a non-aqueous solution or aqueous solution of the compound, M ２ A process in which the material is selected from Ti, Zr, Nb, or Ta, (c) A step of removing the solvent(s) to obtain a solid residue, (d) A step of mixing the solid residue from step (c) with a lithium source and optionally at least one compound of Ti, Al, or Zr, (e) A step of heat-treating the mixture obtained from step (d) at a temperature in the range of 550 to 900°C, A method for producing an electrode active material containing [the specified element].

2. TM is general formula (I) (Ni a Co b Mr c ) 1-d M d (I) (In the formula, a is in the range of 0.6 to 0.99, b is 0 or in the range of 0.01 to 0.

2. c is in the range of 0 to 0.

2. d is in the range of 0 to 0.

1. M is at least one of Al, Mg, Ti, Mo, and W. b + c > 0, a + b + c = 1) The method according to claim 1, wherein the combination of metals is as follows.

3. The method according to claim 1 or 2, wherein the (oxy)hydroxide provided in step (a) has a water content in the range of 50 to 2000 ppm by mass.

4. Said M ２ compound is selected from C １ to C ４ -alkanolates, the method according to any one of claims 1 to 3.

5. M ２ The method according to any one of claims 1 to 4, wherein is selected from Nb and Ta.

6. The method according to any one of claims 1 to 5, wherein step (c) is carried out by evaporation of one or more solvents.

7. The solvent in step (b) is water and C １ ~C ４ - The method according to any one of claims 1 to 6, selected from alkanols.

8. M ２ The method according to any one of claims 1 to 7, wherein the molar ratio of to TM is in the range of 1:100 to 1:1000.

9. The general formula Li includes secondary particles which are aggregates of primary particles. １＋ｘ (M ２ ｙ TM １－ｙ ) （１－ｘ） O ２ A particulate cathode active material wherein TM is Ni, or TM contains Ni and at least one of Mn and Co, x is in the range of 0 to 0.2, and y is in the range of 0.001 to 0.01, M ２ A particulate cathode active material, selected from Zr, Nb, and Ta, which is concentrated on the crystallite surface of primary particles, or otherwise uniformly distributed within such cathode active material.

10. M ２ The particulate cathode active material according to claim 9, wherein the compound is concentrated on the crystallite surface of primary particles in the form of a layer having an average thickness of 2 to 30 nm.

11. M ２ The particulate cathode active material according to claim 9 or 10, wherein is selected from Nb and Ta.

12. TM is general formula (I) (Ni a Co b Mr c ) 1-d M 1 d (I) (In the formula, a is in the range of 0.6 to 0.99, b is 0 or in the range of 0.01 to 0.

2. c is in the range of 0 to 0.

2. d is in the range of 0 to 0.

1. M １ is at least one of Al, Mg, Ti, Mo, and W. a + b + c = 1) A particulate cathode active material according to any one of claims 9 to 11, which is a combination of metals.

13. (E) At least one particulate cathode active material according to any one of claims 9 to 12, (F) Conductive carbon, (G) Binder material A cathode containing this substance.

14. (1) at least one cathode according to claim 13, (2) at least one anode, (3) at least one type of electrolyte A battery containing [something].

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