Electrochemical production of alkali metal hydroxides and sulfuric acid from battery manufacturing and recycling outlet streams
AssigneeRedwood Materials, Inc.
InventorsWesley Luc, Henry von Schroeter, Paul Voigt
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Abstract
Methods of producing sodium hydroxide (NaOH) or lithium hydroxide (LiOH), and sulfuric acid (H2SO4), include generating sodium sulfate (Na2SO4) or lithium sulfate (Li2SO4) from battery manufacturing and recycling and converting the generated Na2SO4 or Li2SO4 to NaOH, LiOH, and H2SO4 via an electrochemical salt-splitting process. The processing steps can be carried out in a closed system such that the generated Na2SO4 or Li2SO4 can be used in the conversion process with optional purification steps. In particular, the LiOH, NaOH, and Na2SO4 are recycled into battery recycling or battery manufacturing processes.
Claims20
A method comprising:
- generating sodium sulfate (Na2SO4) from a battery manufacturing process;
- and
- converting the generated sodium sulfate (Na2SO4) to sodium hydroxide (NaOH) and sulfuric acid (H2SO4) via an electrochemical salt-splitting process.
A method comprising:
- generating lithium sulfate (Li2SO4) from a battery recycling process;
- and
- converting the generated lithium sulfate (Li2SO4) to lithium hydroxide (LiOH) and sulfuric acid (H2SO4) via an electrochemical salt-splitting process.
Dependencies are inferred from the claim text.