Systems and methods for recycling electrochemical energy storage devices
View Patent ↗The present disclosure provides systems and methods for dismantling and/or recycling liquid metal batteries. Such methods can include cryogenically freezing liquid metal battery components, melting and separating liquid metal battery components, and/or treating liquid metal battery components with water.
1. A method for recycling a battery, the method comprising:
(a) providing an electrochemical cell of the battery, the electrochemical cell comprising:
a first electrode comprising a first material, wherein the first electrode is an anode during discharge, and wherein the first material is in a liquid state at an operating temperature of the electrochemical cell;
a second electrode comprising a second material, wherein the second electrode is a cathode during discharge, and wherein at least a portion of the second material is in a liquid state at the operating temperature of the electrochemical cell;
an electrolyte disposed between the first electrode and the second electrode, wherein the electrolyte is capable of conducting ions of the first material that dissolve into the electrolyte during discharge or charge at the operating temperature of the electrochemical cell, and wherein at least a portion of the electrolyte is in a liquid state at the operating temperature of the electrochemical cell; and
a solid or semi-solid intermetallic layer adjacent to the electrolyte, wherein the solid or semi-solid intermetallic layer is formed of the first and second materials; and
(b) recovering at least a portion of the second material from the electrochemical cell to recycle the battery, wherein recovering the at least a portion of the second material from the electrochemical cell comprises (i) sequentially melting at least two of the first electrode, second electrode, electrolyte, and/or intermetallic layer, (ii) immersing the electrochemical cell in water at a rate such that a reaction between the water and a reactive material of the first electrode, second electrode, electrolyte, and/or intermetallic layer does not produce an uncontrollable release of energy, or (iii) removing a reactive material from the electrochemical cell by contacting the first electrode, second electrode, electrolyte and/or intermetallic layer with superheated steam.
2. The method of claim 1 , wherein the first material is a liquid metal.
3. The method of claim 1 , wherein the second material includes one or more of a metal, metalloid and a non-metal.
4. The method of claim 1 , further comprising recovering antimony from the electrochemical cell.
5. The method of claim 1 , wherein the solid or semi-solid intermetallic layer comprises an alloyed product of the first and second materials.
6. The method of claim 1 , wherein the solid or semi-solid intermetallic layer comprises antimony.
7. The method of claim 1 , further comprising recovering at least a portion of the first material from the solid or semi-solid intermetallic layer.
8. The method of claim 1 , wherein the electrochemical cell comprises a reactive metal.
9. The method of claim 8 , wherein the reactive metal includes lithium, sodium, potassium, magnesium or calcium.
10. The method of claim 1 , wherein the operating temperature of the electrochemical cell is at least about 100° C.
11. The method of claim 10 , wherein the operating temperature of the electrochemical cell is at least about 250° C.
12. The method of claim 1 , wherein the first electrode comprises lithium, sodium, potassium, rubidium, cesium, magnesium, barium, calcium, or combinations thereof.
13. The method of claim 1 , wherein the second electrode comprises zinc, cadmium, mercury, aluminum, gallium, indium, silicon, germanium, tin, lead, arsenic, bismuth, antimony, tellurium, selenium, or combinations thereof.
14. The method of claim 1 , wherein the ions of the first material are formed when the first material releases one or more electrons (i) at the first electrode during discharge or (ii) at the second electrode during charge.
15. The method of claim 1 , further comprising recovering at least a portion of the second material from the electrochemical cell when the electrochemical cell is in a cooled state relative to the operating temperature of the electrochemical cell.
16. The method of claim 15 , wherein the electrochemical cell is in a solidified state.
17. The method of claim 1 , wherein the electrochemical cell has an energy storage capacity of at least about 25 Wh.
18. The method of claim 1 , wherein the solid or semi-solid intermetallic layer is between the electrolyte and the second electrode or within the second electrode.
19. The method of claim 1 , wherein the electrochemical cell further comprises a stainless steel casing and wherein the stainless steel casing is recovered and/or recycled.
20. The method of claim 1 , wherein recovering the at least a portion of the second material from the electrochemical cell comprises sequentially melting at least two of the first electrode, second electrode, electrolyte, and/or intermetallic layer.
21. The method of claim 1 , wherein recovering the at least a portion of the second material from the electrochemical cell comprises immersing the electrochemical cell in water at a rate such that a reaction between the water and a reactive material of the first electrode, second electrode, electrolyte, and/or intermetallic layer does not produce an uncontrollable release of energy.
22. The method of claim 21 , wherein the rate of immersing the electrochemical cell is proportional to the rate of gas production.
23. The method of claim 1 , wherein recovering the at least a portion of the second material from the electrochemical cell comprises removing a reactive material from the electrochemical cell by contacting the first electrode, second electrode, electrolyte, and/or intermetallic layer with superheated steam.