Electrode materials for rechargeable zinc cells and batteries produced therefrom
View Patent ↗The present disclosure discloses a rechargeable Zn battery based on layered/tunnelled structure vanadium/molybdenum oxides, with/without the presence of neutral/cationic/anionic species and/or water molecules inserted into the interlayers/tunnels, of nano/microparticle morphology as robust materials for high rate and long term reversible Zn 2+ ion intercalation storage at the positive electrode, that are coupled with a metallic Zn negative electrode, and an aqueous electrolyte. The positive electrode may include electronically conducting additives and one or more binders along with the Zn 2+ intercalation material: the negative electrode is Zn metal in any form; the aqueous electrolyte is of pH 1 to 9 and contains a soluble zinc salt in a concentration range from 0.01 to 10 molar.
1. A zinc ion battery, comprising:
a positive electrode compartment having enclosed therein an intercalation layered positive electrode material described by the formula M x V 2 O 5 .nH 2 O when the positive electrode is in a fully charged state, wherein x is in a range from 0.05 to less than 1, n is in a range from greater than 0 to 2, wherein M is any one or combination of a d-block metal ion, f-block metal ion and alkaline earth ion, the metal M ion being in a +2 to +4 valence state, and wherein said V 2 O 5 is a layered crystal structure having the metal ions M pillared between the layers, and waters of hydration coordinated to the metal ions M;
a negative electrode compartment having enclosed therein a negative electrode for storing zinc;
a separator electrically insulating and permeable to zinc ions separating the positive and negative compartments; and
an electrolyte comprising water and having a salt of zinc dissolved therein.
2. The zinc ion battery according to claim 1 wherein at least a portion of the waters of hydration are hydrogen bonded to the layers.
3. The zinc ion battery according to claim 1 wherein the negative electrode comprises zinc, and wherein the zinc ion battery is a zinc metal battery.
4. The zinc ion battery according to claim 1 wherein the electrolyte has a pH in a range from about 1 to about 8.
5. The zinc ion battery according to claim 1 wherein the intercalation layered positive electrode material has a particulate morphology being particles having a mean size in a range from about 5 nm to about 50 pm.
6. The zinc ion battery according to claim 5 wherein the particles are embedded in an electrically conducting matrix.
7. The zinc ion battery according to claim 6 wherein the electrically conducting matrix comprises any one or combination of carbon and conducting polymer, and including a binder.
8. The zinc ion battery according to claim 7 wherein the binder is any one or combination of styrene butadiene rubber (SBR), sodium carboxymethylcellulose (CMC), polyvinyl acetate (PVAc), polyacrylic acid (PAA), polyethylene glycol (PEG), polybutyl acrylate (PBA), polyurethane, acrylonitrile, polypyrrole, polyaniline, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), perfluorosulfonic acid (PFSA), and poly(3,4-ethylenedioxythiophene) (PEDOT).
9. The zinc ion battery according to claim 1 wherein the negative electrode comprises zinc metal or a zinc alloy in any form.
10. The zinc ion battery according to claim 1 wherein the negative electrode comprises a current collector, and a surface of the current collector facing into the negative electrode compartment having a layer of zinc bound thereto.
11. The zinc ion battery according to claim 10 wherein the current collector is comprised on any one or combination of carbon, boron, lead, vanadium, chromium, manganese, iron, cobalt, nickel, cadmium, tungsten, bismuth, tin, indium, antimony, copper, titanium, and zinc metal.
12. The zinc ion battery according to claim 1 wherein the negative electrode comprises a material that is configured to store elemental zinc by any one or combination of intercalation, conversion, and capacitive storage.
13. The zinc ion battery according to claim 1 wherein the electrolyte further comprises water dissolved zinc present in a range from about 0.01 to about 10 molar.
14. The zinc ion battery according to claim 13 wherein the salt of zinc comprises any one or combination of zinc sulfate, zinc acetate, zinc citrate, zinc iodide, zinc chloride, zinc perchlorate, zinc nitrate, zinc phosphate, zinc triflate, zinc bis(trifluoromethanesulfonyl)imide, zinc tetrafluoroborate, and zinc bromide.
15. The zinc ion battery according to claim 1 wherein the electrolyte further comprises water dissolved zinc present in a range from about 0.1 to about 4 molar.
16. The zinc ion battery according to claim 15 wherein the salt of zinc comprises any one or combination of zinc sulfate, zinc acetate, zinc citrate, zinc iodide, zinc chloride, zinc perchlorate, zinc nitrate, zinc phosphate, zinc triflate, zinc bis(trifluoromethanesulfonyl)imide, zinc tetrafluoroborate, and zinc bromide.