公开(公告)号：US20210347787A1

公开(公告)日：2021-11-11

申请号：US17121347

申请日：2020-12-14

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Minah LEE ,  Jihyun HONG ,  Kyung Yoon CHUNG ,  Jin-Yoo SUH ,  Sang Ok KIM ,  Hyungseok KIM ,  Inyeong KANG ,  Ju Young JANG ,  Jin Kwan CHOI

IPC: C07F1/02 ,  H01M10/0525 ,  H01M4/04 ,  H01M4/36

Abstract: The present disclosure relates to a prelithiation solution and a method for preparing a prelithiated anode using the same. The prelithiation solution and the method for preparing a prelithiated anode using the same according to the present disclosure allow uniform intercalation of lithium ions throughout the anode chemically in a solution via a simple process of immersing the anode in a prelithiation solution having a sufficiently low redox potential as compared to an anode active material. A prelithiated anode prepared by this method has an ideal initial coulombic efficiency and a lithium secondary battery with a high energy density can be prepared based thereon. In addition, the prepared anode is advantageously applicable to large-scale production due to superior stability even in dry air.

公开(公告)号：US20230178793A1

公开(公告)日：2023-06-08

申请号：US17734788

申请日：2022-05-02

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Jihyun HONG ,  Minah LEE ,  Jin Kwan CHOI ,  Jina LEE

IPC: H01M10/056 ,  H01M10/0525

CPC classification number: H01M10/056 ,  H01M10/0525 ,  H01M2300/0025 ,  H01M2300/002 ,  H01M2220/20 ,  H01M2220/30

Abstract: The present disclosure relates to an electrolyte operable in wide temperature ranges and a lithium battery including the same. By dissolving two or more lithium salts in a mixture solvent including three or more different acyclic alkyl carbonate compounds, reactivity with lithium metal and freezing point are decreased at the same time and, therefore, the lifetime characteristics and electrochemical performance of a lithium-ion battery, a lithium-metal battery, or a lithium-ion capacitor using the same are improved significantly.

公开(公告)号：US20220127703A1

公开(公告)日：2022-04-28

申请号：US17131294

申请日：2020-12-22

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Young-Su LEE ,  Young Whan CHO ,  Jae-Hyeok SHIM ,  Jin-Yoo SUH ,  Jihyun HONG ,  Jee Yun JUNG ,  June Hyung KIM ,  Mohammad FAISAL

IPC: C22C38/14 ,  C22C38/12

Abstract: Provided is a hydrogen storage alloy including a ternary alloy of titanium (Ti), iron (Fe), and vanadium (V), wherein V sites in the ternary alloy correspond to some of Ti sites in a binary TiFe alloy including Ti and Fe, and some of Fe sites in the binary TiFe alloy.

公开(公告)号：US20210140862A1

公开(公告)日：2021-05-13

申请号：US17089567

申请日：2020-11-04

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Jin-Yoo SUH ,  Han-Jin KIM ,  Young Whan CHO ,  Woo Sang JUNG ,  Jae-Hyeok SHIM ,  Dong-Ik KIM ,  Young-Su LEE ,  Jihyun HONG

IPC: G01N3/18

Abstract: Provided is an apparatus for evaluating high-temperature creep behavior of metals, the apparatus including a chamber configured to fix a metal sample in an inner space sealed from an external environment, and including, at a lower portion, a metal tube stretchable in a length direction by a pressure of a gas, wherein the apparatus is configured in such a manner that a load received by the chamber in the length direction due to the pressure of the gas injected into the chamber is applied to the metal sample.

公开(公告)号：US20250062310A1

公开(公告)日：2025-02-20

申请号：US18680217

申请日：2024-05-31

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Jihyun HONG ,  Minah LEE ,  Jinkwan CHOI ,  Hun-Gi JUNG ,  Dong-Ik KIM

IPC: H01M4/04 ,  H01M4/02 ,  H01M4/485 ,  H01M4/62

Abstract: Provided are a prelithiation method of a silicon-based active material, the prelithiation method including step S1 of immersing the silicon-based active material in a prelithiation solution including an organic solvent and a lithium-hydrocarbon molecule complex, step S2 of obtaining a powder by washing the silicon-based active material with the organic solvent and drying the silicon-based active material, and step S3 of performing a heat treatment on the powder at a temperature of 400° C. to 800° C. in an inert gas atmosphere, and a silicon-based active material prelithiated by the method.

公开(公告)号：US20230178709A1

公开(公告)日：2023-06-08

申请号：US17741660

申请日：2022-05-11

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Minah LEE ,  Jihyun HONG ,  Hun-Gi JUNG ,  Jin Kwan CHOI

IPC: H01M4/04 ,  H01M4/38 ,  H01M4/587 ,  H01M10/0525

CPC classification number: H01M4/049 ,  H01M4/386 ,  H01M4/587 ,  H01M10/0525 ,  H01M2004/027

Abstract: The present disclosure relates to a delithiation solution and a method for forming an anode active material or an anode using the same. By chemically extracting reactive lithium from a high-capacity anode active material or anode, which has high initial coulombic efficiency due to high lithium content but exhibits decreased stability in dry air or in a solvent for preparation of a slurry, stability can be improve and initial coulombic efficiency can be maintained high. In addition, the method for forming an anode active material or an anode according to the present disclosure can greatly reduce the cost and time required for delivery after production of a lithium-ion battery.

公开(公告)号：US20220102721A1

公开(公告)日：2022-03-31

申请号：US17217413

申请日：2021-03-30

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Minah LEE ,  Jihyun HONG ,  Kyung Yoon CHUNG ,  Jin Kwan CHOI ,  Ju Young JANG

IPC: H01M4/583 ,  H01M10/0525 ,  H01M4/38 ,  H01M10/0569 ,  H01M10/0568 ,  H01M4/525 ,  H01M4/505 ,  H01M4/62 ,  H01M4/04

Abstract: The present disclosure provides a prelithiation solution for a graphite or graphite/silicon composite anode, which includes: (a) a cyclic or linear ether-based solvent; and (b) an aromatic hydrocarbon-lithium complex, and has a reduction potential of 0.25 V (vs Li/Li+) or lower.
According to the present disclosure, lithium ions can be chemically intercalated uniformly throughout a graphite or graphite composite anode in solution phase and a high level of prelithiation may be achieved. In addition, an anode having an initial coulombic efficiency close to 100% may be provided by prelithiating a graphite or graphite composite anode using the prelithiation solution and a commercially applicable lithium secondary battery exhibiting high energy density may be provided based thereon.