Fluorosurfactant as a zinc corrosion inhibitor

Patent metadata

Field	Value
Publication number	US-10826060-B2
Application number	US-201916437429-A
Country	US
Kind code	B2
Filing date	Jun 11, 2019
Priority date	Oct 8, 2014
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

An alkaline electrochemical cell, preferably a zinc/air cell which includes a container; a negative electrode, a positive electrode, wherein said negative electrode and said positive electrode are disposed within the container, a separator located between the negative electrode and the positive electrode, and an alkaline electrolyte, wherein the negative electrode comprises zinc, and a branched chain fluorosurfactant. The fluorosurfactant is preferably a sulfotricarballylate surfactant with multiple fluorinated end groups.

First claim

What is claimed is:

1. An alkaline electrochemical cell, comprising:
a container, a negative electrode, a positive electrode, wherein said negative electrode and said positive electrode are disposed within the container, a separator located between the negative electrode and the positive electrode, and an alkaline electrolyte, wherein the negative electrode comprises zinc and a sulfotricarballylate surfactant;
wherein the sulfotricarballylate is present in an amount from 100 to 1,000 ppm based on the total weight of the zinc.

2. The cell according to claim 1 , wherein the sulfotricarballylate is characterized by the formula

and where Z 1 =Z 2 =Z 3 =F 3 C(CF 2 ) ai (CH 2 ) bi (O(CH 2 ) ci ) di —, where ai =1-2, bi =1-2, ci =2, and di =1-3.

3. The cell according to claim 1 , wherein the sulfotricarballylate is characterized by the formula

and where Z i =Z 2 =Z 3 =F 3 C(CF 2 )(CH 2 )(O(CH 2 CHCH 2 CH 3 )).

4. The cell according to claim 1 , wherein the sulfotricarballylate contains three fluorinated end groups.

5. The cell according to claim 1 , wherein the sulfotricarballylate 0 is in the form of a mixture.

6. The cell according to claim 1 , wherein the positive electrode comprises manganese dioxide.

7. The cell according to claim 1 , wherein the positive electrode is an air electrode.

8. The cell according to claim 4 , wherein each of said fluorinated end groups comprises F 3 C(CF 2 ) 2 .

9. The cell according to claim 4 , wherein each of said fluorinated end groups comprises F 3 C(CF 2 ).

10. An alkaline electrochemical cell, comprising:
a container; an electrode assembly disposed within the container and comprising a negative electrode, a positive electrode, a separator located between the negative electrode and the positive electrode, and an alkaline electrolyte, wherein the negative electrode comprises zinc and a fluorosurfactant, wherein said fluorosurfactant has more than one fluorinated end group;
wherein the sulfotricarballylate is present in an amount from 100 to 1,000 ppm based on the total weight of the zinc.

11. The cell according to claim 10 , wherein said fluorosurfactant has three fluorinated end groups.

12. The cell according to claim 10 , wherein said fluorosurfactant further has an anionic polar group.

13. The cell according to claim 10 , wherein said fluorinated end groups are identical.

14. The cell according to claim 10 , wherein said fluorosurfactant is of the formula

where the groups Z 1 , Z 2 , and Z 3 are, independently of one another, branched or unbranched alkyl groups or groups of the structure R i (A 9 CR 1 R 2 ) ci —(CR 3 R 4 ) c′i ) di —, where the respective indices ci and c′i are, independently of one another, 0-10, and di =0-5, where R i is a branched or unbranched, fluorine-containing alkyl radical, R 1 to R 4 are, independently of one another, hydrogen or a branched or unbranched alkyl group, ci and c′i are not simultaneously 0 , and A=O, S and/or N, Y 1 is an anionic polar group and Y 2 is a hydrogen atom, or vice versa,

X is a cation, and at least one of the groups Z 1 , Z 2 , and Z 3 is a group of the structure R i (A(CR 1 R 2 ) ci —(CR 3 R 4 ) c′i ) di —.

15. The cell according to claim 12 , wherein said anionic polar group is a sulfonate group.

16. The cell according to claim 7 , wherein the surfactant forms at least one monolayer on the surface of said zinc.

17. The cell according to claim 10 , wherein said fluorosurfactant has a molecular weight of between 800 and 1320.

18. The cell according to claim 1 , wherein the sulfotricarballylate is characterized by the formula

and where Z i =Z 2 =Z 3 =F 3 C(CF 2 )(CH 2 )(O(CH 2 CH 2 CH 2 CH 2 )).

Assignees

• Energizer Brands Llc

Inventors

• Marple Jack W

Classifications

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/42 Primary

  Alloys based on zinc · CPC title

• H01M10/24

  Alkaline accumulators · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title