Potassium compound and positive electrode active material for potassium ion secondary batteries containing same

Patent metadata

Field	Value
Publication number	US-10811684-B2
Application number	US-201615781254-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Dec 7, 2015
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

Provided is a material that can be used as a potassium secondary battery positive electrode active material (particularly a potassium ion secondary battery positive electrode active material), other than Prussian blue, by using a potassium compound and a potassium ion secondary battery positive electrode active material comprising the potassium compound, the potassium compound being represented by general formula (1):

K n A k BO m ,

wherein A is a positive divalent element in groups 7 to 11 of the periodic table; B is positive tetravalent silicon, germanium, titanium or manganese, excluding a case in which A is manganese and B is titanium, and a case in which A is cobalt and B is silicon; n is 1.5 to 2.5; and m is 3.5 to 4.5.

First claim

The invention claimed is:

1. A potassium ion secondary battery positive electrode active material comprising a potassium compound represented by general formula (1): K n A k BO m ,
wherein A is positive divalent manganese, iron, or copper; B is positive tetravalent silicon, germanium or manganese k is 0.6 to 1.5; n is 1.5 to 2.5; and m is 3.5 to 4.5.

2. The potassium ion secondary battery positive electrode active material according to claim 1 , wherein the potassium compound has at least one member selected from the group consisting of a cubic structure, a tetragonal structure, an orthorhombic structure, and a monoclinic structure.

3. The potassium ion secondary battery positive electrode active material according to claim 1 , wherein the potassium compound has a mean particle diameter of 0.2 to 200 μm.

4. A method for producing the potassium ion secondary battery positive electrode active material according to claim 1 , the method comprising a heating step of heating a mixture containing potassium; manganese, iron, or copper; silicon, germanium, or manganese; and oxygen.

5. The production method according to claim 4 , wherein the heating temperature in the heating step is 600 to 1500° C.

6. A potassium ion secondary battery positive electrode comprising the potassium ion secondary battery positive electrode active material according to claim 1 .

7. The potassium ion secondary battery positive electrode according to claim 6 , further comprising a conductive material.

8. A potassium ion secondary battery comprising the potassium ion secondary battery positive electrode according to claim 6 .

Assignees

• Aist

Inventors

• Masese Titus Nyamwaro
• Shikano Masahiro
• Sakaebe Hikari
• Senoh Hiroshi
• Sano Hikaru

Classifications

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• C01G51/42

  containing alkali metals, e.g. LiCoO2 · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title