Samsung Sdi Co., Inc.

Jinyoung Kim

Kiyong Ahn

Jinhwa Kim

Donggyu Chang

Jungsue Jang

Minhan Kim

Youngjoo Chae

Donghyun Kil

Jeuk Ha

Jihyun Seog

Jaeha Shim

Aram Choi

Jungyoon Lee

Yangseob Kim

Seonyoung Kwon

Hyeonsun Choi

Dongwan Seo

Youngsun Kong

Sung Ho Choo

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.

Separator and lithium battery including the same

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 particle 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.

Positive active material for rechargeable lithium battery, preparing method thereof and rechargeable lithium battery including the same

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.

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 &#x3bc;m to about 3 &#x3bc;m.

Positive active material for rechargeable lithium battery, method of preparing the same and rechargeable lithium battery including the same

Growing community of inventors

Yongin-si, South Korea

Jinyoung Kim