Water-activated permanganate electrochemical cell

Patent metadata

Field	Value
Publication number	US-10115975-B2
Application number	US-201514609719-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Jan 31, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A water-activated permanganate electrochemical cell includes at least one anode, a solid cathode configured to be electrically coupled to the anode, an electrolyte between the at least one anode and the cathode, and a housing configured to hold the at least one anode, the cathode, and the electrolyte. The electrolyte includes water and permanganate configured to be reduced within the cell in at least a two-step reduction process.

First claim

What is claimed is:

1. A water-activated permanganate electrochemical cell comprising:
at least one anode;
a solid cathode configured to be electrically coupled to the at least one anode, the cathode comprising a porous NiC matrix material;
an electrolyte between the at least one anode and the cathode, the electrolyte including water and a permanganate salt and;
wherein the electrolyte permanganate is configured to be reduced within the cell in at least a two-step reduction process,
the electrolyte includes an amount of water sufficient to support both steps of the two-step reduction process,
the permanganate produces a first reaction product in step one of the reduction process, and
the cathode includes a high-porosity region in the upper section of the cathode and a low-porosity catchment region toward the bottom section of the cathode that is configured to hold the first reaction product from step one in contact with the cathode in order to facilitate step two in the reduction process;
a housing configured to hold the at least one anode, the cathode, and the electrolyte, the housing comprises an injection port configured to introduce water into the housing so that the water flows through the cathode.

2. The electrochemical cell according to claim 1 , wherein the electrolyte injection port is configured to introduce the water and dissolved permanganate into the housing so that the water and the permanganate flow through the cathode.

3. The electrochemical cell according to claim 1 , wherein the electrolyte injection port is configured to introduce the permanganate into the housing so that the permanganate flows through the cathode.

4. The electrochemical cell according to claim 1 , further comprising one or more physical separators between the at least one anode and the cathode.

5. The electrochemical cell according to claim 4 , wherein the one or more physical separators are formed from a polymer mesh material having openings of about 100 μm or larger.

6. The electrochemical cell according to claim 1 , wherein each anode is a solid plate of material.

7. The electrochemical cell according to claim 6 , wherein a plurality of anode plates are disposed within the cathode.

8. The electrochemical cell according to claim 7 , wherein the plurality of anode plates are arranged in a vertical direction so that one end of each anode is surrounded by the cathode.

9. The electrochemical cell according to claim 1 , wherein each anode is an aluminum or aluminum alloy material.

10. The electrochemical cell according to claim 9 , wherein each anode is in a liquid phase and the housing includes an aluminum port configured to introduce the aluminum or aluminum alloy material in a solid phase into the housing.

11. The electrochemical cell according to claim 1 , wherein the electrolyte is a gel and the cathode is coated with the gel.

12. A water-activated permanganate electrochemical cell comprising:
at least one anode;
a solid cathode configured to be electrically coupled to the at least one anode, the cathode comprising a nickel plated graphite material;
an electrolyte between the at least one anode and the cathode, the electrolyte including water and a permanganate salt and;
wherein the electrolyte permanganate is configured to be reduced within the cell in at least a two-step reduction process,
the electrolyte includes an amount of water sufficient to support both steps of the two-step reduction process,
the permanganate produces a first reaction product in step one of the reduction process, and
the cathode includes a high-porosity region in the upper section of the cathode and a low-porosity catchment region toward the bottom section of the cathode that is configured to hold the first reaction product from step one in contact with the cathode in order to facilitate step two in the reduction process;
a housing configured to hold the at least one anode, the cathode, and the electrolyte, the housing comprises an injection port configured to introduce water into the housing so that the water flows through the cathode.

13. The electrochemical cell according to claim 1 , wherein the cathode has a surface area that is greater than or equal to 100 times a surface area of the at least one anode.

14. The electrochemical cell according to claim 1 , wherein the electrolyte includes an aqueous solution comprising sodium chloride.

15. The electrochemical cell according to claim 1 , the first step of the two-step reduction process requiring a first amount of water, the electrolyte including an amount of water greater than the first amount and sufficient to support the second step of the two-step reduction process.

16. The electrochemical cell according to claim 1 , wherein the electrolyte includes at least one inert compound to decrease the activity of water molecules in the solution to help trap the water molecules near the cathode.

17. The electrochemical cell according to claim 1 , wherein the electrolyte includes at least one anion conductivity promoter.

Assignees

• Massachusetts Inst Technology
• Open Water Power Inc

Inventors

• Mckay Ian Salmon

Classifications

• H01M50/417

  Polyolefins · CPC title

• H01M50/627

  Filling ports · CPC title

• H01M4/06

  Electrodes for primary cells · CPC title

• H01M2300/0002

  Aqueous electrolytes · CPC title

• H01M4/463

  Aluminium based · CPC title