Method and apparatus for extracting lithium from solution using bipolar electrodes

An apparatus for extracting lithium from a solution using bipolar electrodes, comprising a cell body, end electrodes, at least one conductive separator, and anion membranes, wherein a number of the anion membranes is greater than a number of the at least one conductive separator;

• wherein the end electrodes comprise a first end electrode and a second end electrode respectively disposed at two ends of the cell body, the first end electrode is configured to connect to a first electrode, and the second end electrode is configured to connect to a second electrode;
• a surface of the first end electrode facing the second end electrode is coated with a lithium-deficient electroactive material, and a surface of the second end electrode facing the first end electrode is coated with a lithium-rich electroactive material;
• wherein the at least one conductive separator is disposed inside the cell body to physically divide the cell body into two or more independent chambers, and the at least one conductive separator is located between the first end electrode and the second end electrode;
• a first surface of the at least one conductive separator facing the first end electrode is coated with the lithium-rich electroactive material, and a second surface of the at least one conductive separator facing the second end electrode is coated with the lithium-deficient electroactive material;
• and
• wherein one of the anion membranes is disposed in each of the independent chambers to divide the each of the independent chambers into two working areas, one of the two working areas is on a lithium-deficient electroactive material side and is used for introducing a lithium-containing raw material solution and is called a first working area, and the other of the two working areas is on a lithium-rich electroactive material side and is used for introducing a supporting electrolyte solution and is called a second working area.