公开(公告)号：US20210320378A1

公开(公告)日：2021-10-14

申请号：US17226999

申请日：2021-04-09

Applicant: Samsung SDI Co., Ltd.

Inventor： Jungyoon Lee ,  Hyeonsun Choi ,  Yangseob Kim ,  Jinyoung Kim

IPC: H01M50/446 ,  H01M50/414 ,  H01M50/431 ,  H01M50/449 ,  H01M10/0525 ,  H01M10/0587

Abstract: This application relates to a separator and a lithium battery employing the same. In one aspect, the separator includes a porous substrate and a coating layer disposed on a surface of the porous substrate. The coating layer includes organic particles, a first binder, and inorganic particles. The organic particles have a first melting point of about 100° C. to about 130° C. The first binder has a second melting point higher than the first melting point by about 30° C. or more. The organic particles are coated by or embedded in the first binder. The separator can maintain a network structure even at a high temperature, making it possible to improve the high-temperature stability of a lithium battery by employing the separator, as well as delaying a rapid increase in temperature and heat generation when a shutdown occurs.

公开(公告)号：US20220311095A1

公开(公告)日：2022-09-29

申请号：US17656333

申请日：2022-03-24

Applicant: Samsung SDI Co., Ltd.

Inventor： Hyeonsun Choi ,  Dongwan Seo ,  Jinyoung Kim

IPC: H01M50/449 ,  H01M50/434 ,  H01M50/417 ,  H01M10/0525

Abstract: Provided are a separator and a lithium battery, the separator including: a porous substrate; a first coating layer on a surface of the porous substrate, the first coating layer including an organic particle having a melting point (Tm) in a range of about 100° C. to about 130° C., a particle-type boehmite, a needle-shaped ceramic particle, and a first binder; a first adhesive layer on another surface of the porous substrate, the first adhesive layer having a glass transition temperature (Tg) of 50° C. or higher, and including a particle-type second binder; and a second adhesive layer on the first coating layer, the second adhesive layer having a glass transition temperature (Tg) of 50° C. or higher, and including a particle-type second binder.

公开(公告)号：US12300807B2

公开(公告)日：2025-05-13

申请号：US17657316

申请日：2022-03-30

Applicant: Samsung SDI Co., Ltd.

Inventor： Jungsue Jang ,  Donghyun Kil ,  Minhan Kim ,  Jinyoung Kim ,  Jinhwa Kim ,  Jihyun Seog ,  Jaeha Shim ,  Kiyong Ahn ,  Donggyu Chang ,  Youngjoo Chae ,  Aram Choi ,  Jeuk Ha

IPC: H01M4/36 ,  C01G53/40 ,  C01G53/44 ,  H01M4/04 ,  H01M4/505 ,  H01M4/525 ,  H01M4/02

Abstract: Disclosed are a positive active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same. The positive active material includes a first positive active material in a form of secondary particles including a plurality of primary particles that are aggregated together, and a second positive active material having a single crystal form, wherein both of the first positive active material and the second positive active material are nickel-based positive active materials, each of the first positive active material and the second positive active material is coated with cobalt, and a maximum roughness of a surface of the second positive active material is greater than or equal to about 15 nm.

公开(公告)号：US11349122B2

公开(公告)日：2022-05-31

申请号：US16817163

申请日：2020-03-12

Applicant: Samsung SDI Co., Ltd.

Inventor： Youngsun Kong ,  Kiyong Ahn ,  Jinyoung Kim ,  Sung Ho Choo ,  Seonyoung Kwon

IPC: H01M4/525 ,  H01M4/505 ,  H01M10/0525 ,  H01M4/02

Abstract: A positive active material for a rechargeable lithium battery includes nickel-based lithium transition metal oxide secondary particles, in which a plurality of primary particles are aggregated. The primary particles include polycrystalline primary particles composed of 2 to 10 single crystals, and each of the single crystals has a particle diameter of about 0.5 μm to about 3 μm.