公开(公告)号：US20190221882A1

公开(公告)日：2019-07-18

申请号：US16102849

申请日：2018-08-14

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Young Whan CHO ,  Ju Young JANG ,  In Yeong KANG ,  Young Su LEE ,  Jin Yoo SUH ,  Chan Soon KANG

IPC: H01M10/0525 ,  H01M4/38 ,  H01M4/133 ,  H01M4/66

CPC classification number: H01M10/0525 ,  H01M4/133 ,  H01M4/386 ,  H01M4/668

Abstract: Provided is an anode active material for a lithium (Li) secondary battery, the material including silicon (Si)-based alloy powder, a carbonized layer at least partially surrounding the Si-based alloy powder serving as cores, and carbon nanofibers (CNFs) extending outward from a surface of the Si-based alloy powder through the carbonized layer.

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.

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.