Fluoride ion electrochemical cell
AssigneesCalifornia Institute of Technology, Centre National de la Recherche Scientifique (CNRS)
InventorRachid Yazami
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Abstract
Electrochemical cells of the present invention are versatile and include primary and secondary cells useful for a range of important applications including use in portable electronic devices. Electrochemical cells of the present invention also exhibit enhanced safety and stability relative to conventional state of the art primary lithium batteries and lithium ion secondary batteries. For example, electrochemical cells of the present invention include secondary electrochemical cells using anion charge carriers capable of accommodation by positive and negative electrodes comprising anion host materials, which entirely eliminate the need for metallic lithium or dissolved lithium ion in these systems.
Claims29
An electrochemical cell comprising:
- a positive electrode;
- a negative electrode;
- and
- an electrolyte provided between said positive electrode and said negative electrode;
- said electrolyte capable of conducting anion charge carriers;
- wherein said electrolyte comprises a solvent and a fluoride salt, wherein said fluoride salt is at least partially present in a dissolved state in said electrolyte, thereby generating fluoride ions in said electrolyte;
- wherein said positive electrode and negative electrode reversibly exchange said anion charge carriers with said electrolyte during charging or discharging of said electrochemical cell;
- wherein said anion charge carriers are said fluoride ions (F−).
An electrochemical cell comprising:
- a positive electrode comprising a first fluoride ion host material, wherein said first fluoride ion host material of said positive electrode is a subfluorinated carbonaceous material having a formula CFx, wherein x is an average atomic ratio of fluorine atoms to carbon atoms and is selected from the range of 0.3 to 1.0;
- a negative electrode comprising a second fluoride ion host material;
- and
- an electrolyte provided between said positive electrode and said negative electrode;
- said electrolyte capable of conducting anion charge carriers;
- wherein said electrolyte comprises a solvent and a fluoride salt, wherein said fluoride salt is at least partially present in a dissolved state in said electrolyte, thereby generating fluoride ions in said electrolyte;
- wherein said positive electrode and negative electrode reversibly exchange said anion charge carriers with said electrolyte during charging or discharging of said electrochemical cell;
- wherein said anion charge carriers are said fluoride ions (F−).
Dependencies are inferred from the claim text.