Purification and use of ferrocyanide solutions

Patent metadata

Field	Value
Publication number	US-10147947-B2
Application number	US-201715840463-A
Country	US
Kind code	B2
Filing date	Dec 13, 2017
Priority date	Mar 20, 2017
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A system and method for efficiently purifying a starting material for a TMCC final product as well as a system and method for efficiently producing high quality TMCC material using the purified starting material.

First claim

What is claimed as new and desired to be protected by Letters Patent of the United States is:

1. A method for manufacturing a transition metal coordination compound (TMCC) material having well faceted cubic crystal grains and possessing a crystallite aggregate size of greater than 10 microns, comprising:
a) reacting an aqueous solution including a ferrocyanide salt and a first quantity of a reducing agent with a first quantity of an oxidizing agent to produce a purified aqueous solution having a second quantity of said reducing agent less than said first quantity; and
b) reacting said purified aqueous solution with an aqueous solution including a set of salts of a transition metal to produce the TMCC material.

2. The method of claim 1 wherein said first quantity of said oxidizing agent is in a range of 10 ppm to 1000 ppm.

3. The method of claim 1 wherein said purified aqueous solution includes a second quantity of said oxidizing agent less than said first quantity of said oxidizing agent.

4. The method of claim 3 wherein said purified aqueous solution includes a reduced oxidizing agent.

5. The method of claim 4 wherein said oxidizing agent includes a first class oxidizing agent wherein said reduced oxidizing agent includes said ferrocyanide salt.

6. The method of claim 5 wherein said first class oxidizing agent includes one or more materials selected from the group consisting of potassium ferricyanide, sodium ferricyanide, and combinations thereof.

7. The method of claim 4 wherein said oxidizing agent includes a second class oxidizing agent wherein said reduced oxidizing agent includes a material that dissipates from said purified aqueous solution prior to said reacting step b.

8. The method of claim 4 wherein said oxidizing agent includes a third class oxidizing agent wherein said reduced oxidizing agent includes a material that is generally inert in said reacting step b.

9. The method of claim 4 wherein said oxidizing agent includes a fourth class oxidizing agent wherein said reduced oxidizing agent includes a particular quantity of a material that degrades said reacting step b less than said particular quantity of said reducing agent degrades said reacting step b.

10. The method of claim 1 wherein said aqueous solution includes a pH in a range of 3-12.

11. The method of claim 1 wherein said purified aqueous solution includes a pH in a range of 3-12.

12. The method of claim 1 wherein both said aqueous solution and said purified aqueous solution includes a pH in a range of 3-12.

13. The method of claim 1 wherein said oxidizing agent includes one or more materials selected from the group consisting of hexacyanometallates such as sodium ferricyanide, potassium ferricyanide, and combinations thereof.

14. The method of claim 1 wherein said oxidizing agent includes one or more materials selected from the group consisting of non-metallic mineral oxidants producing one or more of hypervalent iodine compounds, perchlorates, peroxides, peroxy acids, and combinations thereof.

15. A method for manufacturing a transition metal coordination compound (TMCC) material having well faceted cubic crystal grains and possessing a crystallite aggregate size of greater than 10 microns, comprising:
a) reacting an aqueous solution including a ferrocyanide salt and a first quantity of a reducing agent with a first quantity of an oxidizing agent to produce a purified aqueous solution having a second quantity of said reducing agent less than said first quantity; and
b) reacting said purified aqueous solution with an aqueous solution including a set of salts of a transition metal to produce the TMCC material;
wherein said oxidizing agent includes one or more materials selected from the group consisting of sulfur containing compounds such as sulfur trioxide.

Assignees

• Natron Energy Inc

Inventors

• Motallebi Shahrokh
• Wessells Colin Deane

Classifications

• C01C3/12 Primary

  Simple or complex iron cyanides · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• C01P2004/50

  Agglomerated particles · CPC title

• C01P2002/30

  Three-dimensional structures · CPC title