Electrochemical cell
US-2018151916-A1 · May 31, 2018 · US
Phosphonium-based ionic liquids for lithium metal-based batteries
US10446875B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10446875-B2 |
| Application number | US-201715606964-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 26, 2017 |
| Priority date | May 26, 2017 |
| Publication date | Oct 15, 2019 |
| Grant date | Oct 15, 2019 |
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- Title
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Abstract
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An electrolyte for Li-ion and other secondary electrochemical cells includes an FSI anion and at least one of methyltriethylphosphonium; trimethylisobutylphosphonium; methyltributylphosphonium; and trihexyltetradecylphosphonium. The electrolyte uniquely enables stable cell cycling even when water is present in the electrolyte at levels as high as 5000 ppm. Methyltriethylphosphonium and trimethylisobutylphosphonium-containing electrolytes are particularly effective in this water-stabilizing capacity.
First claim
Opening claim text (preview).
What is claimed is: 1. A secondary electrochemical cell comprising: an anode; a cathode; and an electrolyte comprising: a salt comprising an active metal cation, configured to be reduced at the anode during charging, and bis(fluorosulfonyl)imide (FSI); an ionic liquid comprising FSI and an organic cation selected from the group consisting of: methyltriethylphosphonium; trimethylisobutylphosphonium; methyltributylphosphonium; and trihexyltetradecylphosphonium; and water, present at a concentration of at least 50 ppm. 2. The cell as recited in claim 1 , wherein the active metal cation comprises Li+. 3. The cell as recited in claim 2 , wherein the anode comprises lithium metal. 4. The cell as recited in claim 1 , wherein the salt is present, relative to the ionic liquid, at a molar ratio of at least 1:1. 5. The cell as recited in claim 1 , wherein the salt is present at its saturation point in the ionic liquid. 6. The cell as recited in claim 1 , wherein the organic cation comprises trimethylisobutylphosphonium. 7. The cell as recited in claim 1 , wherein the organic cation comprises methyltriethylphosphonium. 8. The cell as recited in claim 1 , wherein water is present at a concentration of at least 100 ppm. 9. The cell as recited in claim 1 , wherein water is present at a concentration of at least 500 ppm. 10. The cell as recited in claim 1 , wherein water is present at a concentration of at least 1000 ppm. 11. The cell as recited in claim 1 , wherein water is present at a concentration of at least 4000 ppm. 12. An electrolyte composition comprising: a salt comprising an active metal cation and bis(fluorosulfonyl)imide (FSI); an ionic liquid comprising FSI and an organic cation selected from the group consisting of: methyltriethylphosphonium; trimethylisobutylphosphonium; methyltributylphosphonium; and trihexyltetradecylphosphonium; and water, present at a concentration of at least 50 ppm. 13. The electrolyte composition as recited in claim 12 , wherein the active metal cation comprises Li+. 14. The electrolyte composition as recited in claim 12 , wherein the organic cation comprises trimethylisobutylphosphonium. 15. The electrolyte composition as recited in claim 12 , wherein the organic cation comprises methyltriethylphosphonium. 16. The electrolyte composition as recited in claim 12 , wherein water is present at a concentration of at least 100 ppm. 17. The electrolyte composition as recited in claim 12 , wherein water is present at a concentration of at least 500 ppm. 18. The electrolyte composition as recited in claim 12 , wherein water is present at a concentration of at least 1000 ppm. 19. The electrolyte composition as recited in claim 12 , wherein water is present at a concentration of at least 4000 ppm. 20. The electrolyte composition as recited in claim 12 , wherein the salt is present at its saturation point in the ionic liquid.
Assignees
Inventors
Classifications
characterised by the solutes · CPC title
Room temperature molten salts comprising at least one organic ion · CPC title
Acyclic saturated phosphonium compounds · CPC title
- H01M10/0566Primary
Liquid materials · CPC title
Li-accumulators · CPC title
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- What does patent US10446875B2 cover?
- An electrolyte for Li-ion and other secondary electrochemical cells includes an FSI anion and at least one of methyltriethylphosphonium; trimethylisobutylphosphonium; methyltributylphosphonium; and trihexyltetradecylphosphonium. The electrolyte uniquely enables stable cell cycling even when water is present in the electrolyte at levels as high as 5000 ppm. Methyltriethylphosphonium and trimethy…
- Who is the assignee on this patent?
- Toyota Eng & Mfg North America, Univ Deakin, Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M10/0566. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Oct 15 2019 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).