公开(公告)号：US20240167182A1

公开(公告)日：2024-05-23

申请号：US17783210

申请日：2022-04-21

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zhongwei ZHAO ,  Lihua HE ,  Wenhua XU

IPC: C25C7/02 ,  C25C1/02

CPC classification number: C25C7/02 ,  C25C1/02

Abstract: The present disclosure relates to a high-selectivity hydrophilic electrode for electrochemically extracting lithium and a preparation method thereof. The preparation method includes the step of carrying out surface coating modification on an electrode active material by using polydopamine. The interception of impurity ions is achieved by utilizing the advantages, which polydopamine has, of preferentially accumulating and transporting lithium ions, thereby improving the selectivity of the electrode active material on lithium. In the pulping process of an electrode adsorption material, a hydroxyl-containing polar hydrophilic organic polymer compound is introduced to perform blending modification, thereby improving the hydrophilicity of a binder polyvinylidene fluoride (PVDF). In addition, pore formation via inorganic salts is combined with a drying mode of “low temperature-high temperature” so that the “porous-microcrack” morphology is formed on the electrode, thereby improving the mass transfer effect of the solution inside the electrode. The preparation method of the electrode disclosed by the present disclosure has the characteristics of simplicity, practicability, environmental friendliness, low cost and the like, and is easy for industrial production.

公开(公告)号：US20230212769A1

公开(公告)日：2023-07-06

申请号：US18086697

申请日：2022-12-22

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zhongwei ZHAO ,  Lihua HE ,  Xuheng LIU

IPC: C25C1/02 ,  C25C7/02 ,  C25C7/04

CPC classification number: C25C1/02 ,  C25C7/02 ,  C25C7/04

Abstract: An electrochemical method and an apparatus for extracting lithium from a solution using bipolar electrodes are provided. The apparatus adopts electrodes respectively coated with a lithium-rich electroactive material and a lithium-deficient electroactive material as end plates, which are separated by a plurality of bipolar electrodes coated with a lithium-rich electroactive material and a lithium-deficient electroactive material respectively on two sides, where the side of the bipolar electrode facing the end plate of the lithium-rich electroactive material is coated with the lithium-deficient electroactive material, and the side of the bipolar electrode facing the end plate of the lithium-deficient electroactive material is coated with the lithium-rich electroactive material. The apparatus adopts a conventional voltage, requires a small total current and a simple power supply, greatly reduced the amount of busbar required, allows for easy process control, and is suitable for industrial production.

公开(公告)号：US20230158424A1

公开(公告)日：2023-05-25

申请号：US17992949

申请日：2022-11-23

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Jiangtao LI ,  Zhongwei ZHAO ,  Zhichao LI ,  Xingyu CHEN ,  Xuheng LIU ,  Lihua HE ,  Fenglong SUN ,  Yongjin LUO ,  Muye CUI

IPC: B01D9/00 ,  C01G39/00

CPC classification number: B01D9/0063 ,  B01D9/005 ,  C01G39/006 ,  B01D2009/0086 ,  C01P2002/72 ,  C01P2004/03

Abstract: A method for crystallization of β-ammonium tetramolybdate includes: performing a stepwise pH-adjusting treatment of an ammonium molybdate solution via zoning to obtain the β-ammonium tetramolybdate. When feeding the ammonium molybdate solution into a reaction system from a first zone and then into second to sixth zones successively, pH1 of a resultant solution in the first zone is 7.0-6.0; pH2 of a resultant solution in the second zone is less than 6 and greater than or equal to 4; pH3 of a resultant solution in the third zone is less than 4 and greater than or equal to 2.5; pH4 of a crystallized slurry in the fourth zone is less than 2.5 and greater than or equal to 1; pH5 of a crystallized slurry in the fifth zone is 2.5-4.0; and pH6 of a crystallized slurry in the sixth zone is less than 2.5 and greater than or equal to 2.0.

公开(公告)号：US20230203687A1

公开(公告)日：2023-06-29

申请号：US18086681

申请日：2022-12-22

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Lihua HE ,  Zhongwei ZHAO ,  Xuheng LIU

IPC: C25C1/02 ,  C25C7/02 ,  C25C7/04

CPC classification number: C25C1/02 ,  C25C7/02 ,  C25C7/04

Abstract: A membrane-stacked electrolytic bath for lithium extraction from salt lakes by electrochemical intercalation/deintercalation includes a positioning supporting plate as well as a first compressing plate, a first rubber gasket, at least one electrochemical intercalation/deintercalation unit, a second rubber gasket, and a second compressing plate which are sequentially arranged in an overlapped manner; a compressing apparatus for abutting against the second compressing plate is arranged on one side of the second compressing plate to enable peripheral edges of the first compressing plate, the first rubber gasket, the electrochemical intercalation/deintercalation unit, the second rubber gasket, and the second compressing plate to be sealed; the first compressing plate is provided with water outlet pipes communicated with the electrochemical intercalation/deintercalation unit; and the second compressing plate is provided with water inlet pipes communicated with the electrochemical intercalation/deintercalation unit.