Samsung Sdi Co., Inc.

Jeuk Ha

Kiyong Ahn

Yumi Song

Eunok Oh

Jinhwa Kim

Donggyu Chang

Jungsue Jang

Minkyu Kim

Seonyoung Kwon

Minhan Kim

Soonrewl Lee

Youngjoo Chae

Donghyun Kil

Jinyoung Kim

Jihyun Seog

Naoyuki Hase

Jaeha Shim

Aram Choi

Taehee Kwak

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 electrode for a rechargeable lithium battery includes a positive active material including small particle diameter monolith particles having a particle diameter of about 1 μm to about 8 μm and including a first nickel-based lithium metal oxide, and large particle diameter secondary particles having a particle diameter of about 10 μm to about 20 μm and including a second nickel-based lithium metal oxide. An X-ray diffraction peak intensity ratio (I(003)/I(104)) of the positive electrode is greater than or equal to about 3. A rechargeable lithium battery includes the positive electrode.

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

A positive active material for a rechargeable lithium battery includes a first compound represented by Chemical Formula 1 and a second compound represented by Chemical Formula 2, the second compound having a smaller particle size than that of the first compound, wherein cation mixing in the surface portion of the positive active material is less than or equal to about 7.5%, cation mixing in the bulk of the positive active material is less than or equal to about 3%, a residual lithium content on the surface of the positive active material is less than or equal to about 3,000 ppm, and the first compound and the second compound each independently include 90 at % to about 98 at % of Ni with respect to the metals excluding Li.LiNiCoMO,  Chemical Formula 1LiNiCoMO.  Chemical Formula 2

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

A positive electrode for a rechargeable lithium battery includes a positive active material including small particle diameter monolith particles having a particle diameter of about 1 &#x3bc;m to about 8 &#x3bc;m and including a first nickel-based lithium metal oxide, and large particle diameter secondary particles having a particle diameter of about 10 &#x3bc;m to about 20 &#x3bc;m and including a second nickel-based lithium metal oxide. An X-ray diffraction peak intensity ratio (I(003)/I(104)) of the positive electrode is greater than or equal to about 3. A rechargeable lithium battery includes the positive electrode.

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Yongin-si, South Korea

Jeuk Ha