公开(公告)号：US20230231129A1

公开(公告)日：2023-07-20

申请号：US18002596

申请日：2021-06-23

Applicant: SAFT

Inventor： Cécile TESSIER ,  Patrick BERNARD ,  Kamen NECHEV ,  Carine STEINWAY ,  Xilin CHEN ,  Cédric GOUSSET ,  Sylvie HERREYRE

IPC: H01M4/58 ,  H01M10/052 ,  H01M4/505 ,  H01M4/525 ,  H01M50/578 ,  H01M50/581

CPC classification number: H01M4/5825 ,  H01M10/052 ,  H01M4/505 ,  H01M4/525 ,  H01M50/578 ,  H01M50/581 ,  H01M2220/20 ,  H01M2004/021

Abstract: The use of a blend of a lithium nickel oxide and a lithium manganese iron phosphate as an active material composition in the cathode of a lithium secondary electrochemical cell for automotive applications, such as hybrid and electric vehicles. This blend allows decreasing the porosity of a lithium manganese iron phosphate-based cathode. It also allows improving the detectability of a gas release in the cell in case of an abnormal operation of the cell. It allows lowering the cell impedance at a low state of charge, typically less than 30%, and reducing the impedance increase of the cell during the cell lifespan.

公开(公告)号：US20220367842A1

公开(公告)日：2022-11-17

申请号：US17319654

申请日：2021-05-13

Applicant: SAFT AMERICA

Inventor： Xilin CHEN ,  Frank CAO ,  Tyler RUFF ,  Jian DONG ,  Carine MARGEZ STEINWAY ,  Thomas GRESZLER ,  Kamen NECHEV

IPC: H01M4/04 ,  H01M10/0525 ,  H01M4/58 ,  H01M10/44

Abstract: Pre-lithiation methods using lithium vanadium fluorophosphate (e.g., LiVPO4F and its derivatives) (“LVPF”) as a cathode active material in a lithium-ion secondary battery. The pre-lithiation methods include compensating for an expected loss of active lithium by selecting LVPF having a specific pre-lithiated chemistry (or a blend of LVPF selected to have a specific pre-lithiated chemistry) and selecting a total amount of the pre-lithiated LVPF. The pre-lithiation methods may include initially charging the lithium-ion secondary battery at the lower of the two charge/discharge plateaus of LVPF to release active lithium.

公开(公告)号：US20190006667A1

公开(公告)日：2019-01-03

申请号：US16062977

申请日：2015-12-18

Applicant: SAFT

Inventor： Kamen NECHEV ,  Yannick BORTHOMIEU ,  Chengsong MA ,  Thomas GRESZLER ,  Cecile TESSIER

IPC: H01M4/485 ,  H01M10/0525

Abstract: A Low Earth Orbit (LEO) satellite has 95 to 105 minutes orbit time with only 60-65 minutes available for recharging. Due to the low charge capability of a Li-ion graphite cell, depth of discharge is limited for this application. The cell of the invention using a lithiated titanate oxide or a titanate oxide able to be lithiated in the negative electrode allows increase of depth of discharge. Increasing charge rate without amplifying capacity loss per cycle allows improvement of useful specific energy per cycle. Depth of discharge values up to 70-80% can be envisioned. Even if the cell exhibits low specific energy, the LEO application is a specific case where useful energy per cycle can be optimized to 70 to 80 Wh/kg.