Additive for electrolyte of lead-acid batteries

• US 4,617,244 A
• Filed: 06/24/1985
• Issued: 10/14/1986
• Est. Priority Date: 06/24/1985
• Status: Expired due to Fees

• Current Assignee: Roland M. Greene
• Original Assignee: Roland M. Greene
• Inventors: Greene, Roland M.
• Primary Examiner(s): Hearn, Brian E.
• Assistant Examiner(s): Kalafut, Stephen J.
• Application Number:
  US06/747,927
• Time in Patent Office: 477 Days
• Field of Search: 429/198, 429/203, 429/205
• US Class Current: 429/203
• CPC Class Codes: H01M 10/08 Selection of materials as electrolytes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A new type of additive to be added to the electrolyte of lead-acid storage batteries to improve their operation, such as chargeability and startability, comprising a mixture of an iron chelate and a magnesium salt or chelate.

Claims

1. A lead-acid storage battery containing as an electrolyte for each cell, an aqueous sulfuric acid solution containing an activating amount of an additive comprising a mixture of an iron chelate and a magnesium salt or chelate, the chelates for the iron and magnesium being formed from chelating agents which form 4 to 6 membered rings with the iron and magnesium and which contain a member of the group consisting of amine groups, phenol groups and aldehyde groups.

2. A lead-acid storage battery as defined in claim 1 wherein the mixture contains the iron and magnesium in a mole ratio of 1:

1 to 2;

1.

3. A lead-acid storage battery as defined in claim 1 wherein the iron chelate is a chelate of iron and a polyalkylene polyamine polyalkanoic acid.

4. A lead-acid storage battery as defined in claim 1 wherein the iron chelate is a chelate of iron and a polyethylene polyamine polytetracetic acid.

5. A lead-acid storage battery as defined in claim 1 wherein the iron chelate is a chelate of iron and ethylene diamine tetracetic acid.

6. A lead-acid storage battery as defined in claim 1 wherein the magnesium salt is magnesium sulfate.

7. A lead-acid storage battery as defined in claim 1 wherein the additive is prepared by adding a chelating agent and an iron salt to water and then adding a substantially water-soluble magnesium salt or chelate, and combining this mixture with an aqueous sulfuric acid solution.

8. A lead-acid storage battery as defined in claim 1 wherein the chelating agent is an alkylene polyamine polyalkanoic acid.

9. A lead-acid storage battery as in claim 1 wherein the additive is one containing a chelate of iron and a polyalkylene polyamine polyalkanoic acid and magnesium sulfate.