Lithium metal recovery and synthesis
A process and system for creating a lithium ion anolyte from lithium alloys. Metal and lithium alloys are processed to remove the metal with lithium from the alloy remaining. A lithium ion anolyte formed may be used in a process to form lithium metal. Alternatively, a process and system for recovering lithium from sources such as lithium alloys and lithium metal oxides and other feedstock such as recycled batteries into a thin lithium metal film via electrodeposition in an organic electrolyte contacting both anode (holder for lithium source) and cathode (substrate for lithium deposition) in a single-compartment electrolysis cell.
1. A method of producing a lithium ion containing anolyte comprising:
dispersing lithium-aluminum alloy powder in aqueous solvent;
forming a lithium-ion aqueous solution with aluminum dispersed therein;
filtering the lithium-ion aqueous solution, removing the aluminum; and
increasing the concentration of lithium ions in the filtered lithium-ion aqueous solution.
2. The method of claim 1 , further comprising, after filter, collecting solid aluminum.
3. The method of claim 1 , wherein the powder comprises nanopowder or micropowder of a lithium-aluminum material.
4. The method of claim 1 , wherein the lithium-ion aqueous solution is free from surfactants.
5. The method of claim 1 , further comprising, prior to dispersing the lithium-aluminum powder, cleaning the lithium-aluminum.
6. The method of claim 1 , wherein the lithium-ion containing solution is heated to up to 100° C. prior to filtering.
7. A method of producing a lithium ion containing anolyte comprising:
dissolving lithium-M alloy powder in an aqueous acid bath, forming an aqueous acidic solution; and
removing M from the aqueous acidic solution;
wherein the M is selected from a group consisting of lithium-aluminum (Li—Al), lithium-tin (Li—Sn), lithium-antimony (Li—Sb), lithium-bismuth (Li—Bi), lithium-silicon (Li—Si), lithium-gold (Li—Au), lithium-mercury (Li—Hg), lithium-thallium (Li—Tl), lithium lead (Li—Pb), lithium-aluminum-copper (Li—Al—Cu), lithium tin oxide, lithium iron oxide (LFP), lithium cobalt oxide (LCO), lithium copper oxide, lithium chromium oxides, lithium manganese oxides, lithium nickel oxides, lithium molybdenum oxides, and lithium titanium-based oxides.
8. The method of claim 7 further comprising, after removal of M, increasing the concentration of lithium ions in the filtered lithium-ion aqueous acid solution.
9. The method of claim 7 , wherein removing M comprises:
selectively precipitate M from the aqueous acidic solution; and
filtering the aqueous acidic solution, removing precipitated M.
10. The method of claim 9 , wherein selective precipitation is by addition of a precipitating agent.
11. The method of claim 7 , wherein removing M comprises selectively removing M by electrodeionization.
12. The method of claim 7 , wherein removing M comprises passing the aqueous solution through a lithium-ion conducting membrane.
13. The method of claim 7 , wherein the aqueous acid bath comprises an acid selected from nitric acid (HNO 3 ) and sulfuric acid (H 2 SO 4 ).
14. The method of claim 7 , wherein the aqueous acid bath has a pH of 1-3.
15. The method of claim 7 , wherein the aqueous acid bath has a pH of 2-4 and a temperature of 30-100° C.