Positive electrode active material, method for producing positive electrode active material, positive electrode, and secondary battery

Patent metadata

Field	Value
Publication number	US-2020403226-A1
Application number	US-201816646654-A
Country	US
Kind code	A1
Filing date	Sep 12, 2018
Priority date	Sep 15, 2017
Publication date	Dec 24, 2020
Grant date	—

Abstract

The invention discloses a positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, including: a particle including a nucleus and a crystal of vanadium oxide grown from the nucleus as a starting point and having a maximum length of 5 μm or less in the major axis direction.

First claim

1 . A positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, comprising:
a particle comprising
a nucleus and
a crystal of vanadium oxide grown from the nucleus as a starting point and having a maximum length of 5 μm or less in a major axis direction.

2 . The positive electrode active material according to claim 1 , wherein the nucleus is formed of at least one selected from the group consisting of a titanium compound, an iron compound, and graphite.

3 . A positive electrode comprising the positive electrode active material according to claim 1 .

4 . A secondary battery comprising the positive electrode according to claim 3 , wherein the secondary battery is a lithium ion secondary battery or a magnesium secondary battery.

5 . A method for producing a positive electrode active material for a magnesium secondary battery or a lithium ion secondary battery, comprising:
a step (1) of mixing a nucleation material solution in which the nucleation material is dissolved or dispersed and a solution containing a vanadium compound to form a mixed solution; a step (2) of adjusting the mixed solution to be acidic; and a precipitation step (3) of precipitating a crystal of vanadium oxide, wherein the precipitation step (3) is a step (3a) of precipitating vanadium oxide starting from a nucleus by precipitating the nucleus in the mixed solution, or a step (3b) of precipitating vanadium oxide starting from the nucleation material dispersed in the mixed solution.

6 . The method for producing a positive electrode active material according to claim 5 , wherein the nucleation material is at least one selected from the group consisting of a titanium compound, an iron compound, and graphite.

7 . The method for producing a positive electrode active material according to claim 5 , wherein the precipitation step is performed at a temperature of 50 to 100° C.

8 . The method for producing a positive electrode active material according to claim 5 , wherein the mixed solution comprises a carbonate compound.

9 . The method for producing a positive electrode active material according to claim 8 , wherein the carbonate compound is at least one selected from the group consisting of sodium carbonate, ammonium carbonate, potassium carbonate, lithium carbonate, sodium hydrogen carbonate, ammonium hydrogen carbonate, and potassium hydrogen carbonate.

10 . The method for producing a positive electrode active material according to claim 5 , further comprising a step of firing the vanadium oxide crystals precipitated in the precipitation step at a temperature of 260 to 315° C.

11 . A positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, comprising:
a particle comprising a crystal of a vanadium oxide which is grown from a nucleus as a starting point and whose growth is suppressed to a maximum length of 5 μm or less in a major axis direction.

12 . The positive electrode active material according to claim 11 , wherein the nucleus is formed of at least one selected from the group consisting of a titanium compound, an iron compound, and graphite.

13 . A positive electrode comprising the positive electrode active material according to claim 11 .

14 . A secondary battery comprising a positive electrode according to claim 13 , which is a lithium ion secondary battery or a magnesium secondary battery.

15 . A positive electrode comprising the positive electrode active material according to claim 2 .

16 . A secondary battery comprising the positive electrode according to claim 15 , wherein the secondary battery is a lithium ion secondary battery or a magnesium secondary battery.

17 . A positive electrode comprising the positive electrode active material according to claim 12 .

18 . A secondary battery comprising a positive electrode according to claim 17 , which is a lithium ion secondary battery or a magnesium secondary battery.

Assignees

• Sanoh Ind Co Ltd

Inventors

• Arai Koga-Shi
• Sugita Kazuyuki
• Honda Atsushi
• Takimoto Yuichiro
• Kurihara Hideki
• Inamoto Masashi
• Doumae Kyousuke

Classifications

• C01G31/02

  Oxides · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title