Simultaneous production method of lithium hydroxide and sulfuric acid

A method for simultaneously preparing lithium hydroxide and sulfuric acid, the method comprising:

• preparing a bipolar membrane electrodialysis device including a first bipolar membrane, an anion exchange membrane, a cation exchange membrane, and a second bipolar membrane in which an acid chamber is formed between the first bipolar membrane and the anion exchange membrane, a salt chamber is formed between the anion exchange membrane and the cation exchange membrane, and a base chamber is formed between the cation exchange membrane and the second bipolar membrane;
• adding a lithium sulfate aqueous solution to the salt chamber, adding a sulfuric acid aqueous solution to the acid chamber, and adding a lithium hydroxide aqueous solution to the base chamber of the bipolar membrane electrodialysis device;
• and
• discharging a desalination solution formed in the salt chamber, discharging the sulfuric acid aqueous solution formed in the acid chamber, and discharging the lithium hydroxide aqueous solution formed in the base chamber of the bipolar membrane electrodialysis device,
• wherein a migration amount weight ratio between water (H2O) and a lithium cation (Li+) in the cation exchange membrane of the bipolar membrane electrodialysis device is 40 or less.