公开(公告)号：US20250137154A1

公开(公告)日：2025-05-01

申请号：US18934563

申请日：2024-11-01

Applicant: Worcester Polytechnic Institute

Inventor： Yan Wang ,  Panya Thanwisai ,  Zeyi Yao

IPC: C25C1/06

Abstract: Production of high purity iron powder employs high efficiency low temperature electrolysis resulting in a process requiring substantially less energy with no CO2 gas and has high energy reduction. Configurations provide a renewable electricity supply that is environmental benign with low energy consumption. A hematite (Fe2O3), carbon and highly concentrated NaOH combine to form an electronically and ionically conductive suspension for iron production. The suspension is flowable which can also be applied to a flow electrolysis system. High purity iron powder is produced at the cathode side while the anode side can produce O2 gas as a byproduct.

公开(公告)号：US20240258596A1

公开(公告)日：2024-08-01

申请号：US18427320

申请日：2024-01-30

Applicant: Worcester Polytechnic Institute

Inventor： Yan Wang ,  Zeyi Yao ,  Xiaotu MA

IPC: H01M10/54 ,  C01B32/21 ,  C22B1/16 ,  C22B7/00 ,  H01M4/02 ,  H01M4/583

CPC classification number: H01M10/54 ,  C01B32/21 ,  C22B1/16 ,  C22B7/007 ,  H01M4/583 ,  C01P2002/72 ,  C01P2002/82 ,  C01P2004/03 ,  C01P2006/40 ,  H01M2004/027

Abstract: A purification process for recycled graphite for use as anode material in Li-ion batteries includes a sequence of leaching and heat treatment followed by washing with deionized (DI) water and an acid wash. A graphite source results from a suitable process such as acid leaching of black mass from a battery recycling stream, where the leach removes a substantial portion of metal salts used for cathode materials. Impurities, most notably aluminum oxide and residual cathode materials, are often present in trace amounts in the graphite source. A sequence of heating (sintering) and pH adjusted washing further purifies the graphite into a modified, recycled graphite exceeding 99.5% purity for use in a recycled battery.