Process of preparing a chemically pre-formed (cpf) iron negative electrode with oxidizing compounds
US-2015060740-A1 · Mar 5, 2015 · US
Accelerated formation and increased performance in chemically pre-formed (CPF) iron negative electrodes
US9997767B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9997767-B2 |
| Application number | US-201414478843-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 5, 2014 |
| Priority date | Sep 5, 2013 |
| Publication date | Jun 12, 2018 |
| Grant date | Jun 12, 2018 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
Provided is a process for preparing an electrode comprising an iron active material. The process comprises first fabricating an electrode comprising an iron active material, and then treating the surface of the electrode with an oxidant to thereby create an oxidized surface. The resulting iron electrode is preconditioned prior to any charge-discharge cycle to have the assessable surface of the iron active material in the same oxidation state as in discharged iron negative electrodes active material.
First claim
Opening claim text (preview).
What is claimed is: 1. An electrode which has not been subject to a charge-discharge cycle, comprising an iron active material, a polyvinyl alcohol binder and sulfur, which electrode surface has an oxidized iron surface and areas of interparticle contact that are in an oxidized state different from the oxidized iron surface, which electrode is prepared by a process comprising: i) fabricating an electrode comprising an iron active material, and ii) treating the surface of the electrode with an oxidant to thereby create an oxidized surface prior to the electrode being subjected to a charge-discharge cycle. 2. The electrode of claim 1 , wherein the oxidation state of the oxidized iron surface is +2, +2/+3, +3 or +4. 3. The electrode of claim 1 , wherein the electrode further comprises a conductive additive. 4. The electrode of claim 3 , wherein the conductive additive comprises nickel, or copper or carbon black. 5. The electrode of claim 1 , wherein the electrode comprises an iron active material comprising about: 50-90 wt % iron powder 5-30 wt % nickel powder 0.5-5.0 wt % binder, and 0.25-20 wt % sulfur. 6. The electrode of claim 1 , wherein the electrode comprises a single layer of conductive substrate coated on at least one side with a coating comprising the iron active material. 7. The electrode of claim 6 , wherein the substrate is comprised of nickel plated steel. 8. The electrode of claim 1 , wherein the porosity of the electrode is in the range of about 15-50%.
Assignees
Inventors
Classifications
- H01M4/049Primary
Manufacturing of an active layer by chemical means · CPC title
Sulfides · CPC title
Electric conductive fillers · CPC title
Iron electrodes · CPC title
Processes of manufacture · CPC title
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- What does patent US9997767B2 cover?
- Provided is a process for preparing an electrode comprising an iron active material. The process comprises first fabricating an electrode comprising an iron active material, and then treating the surface of the electrode with an oxidant to thereby create an oxidized surface. The resulting iron electrode is preconditioned prior to any charge-discharge cycle to have the assessable surface of the …
- Who is the assignee on this patent?
- Encell Technology Inc
- What technology area does this patent fall under?
- Primary CPC classification H01M4/049. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 12 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).