Samsung Electronics Co., Ltd.

Samsung Sdi Co., Inc.

Dongsu Ko

Jusik Kim

Byungjin Choi

SeWon Kim

Kwangjin Park

Hyoungwoo Choi

Gabin Yoon

Changhoon Jung

Kyoungmin Min

Hyomin Kim

Seungrim Yang

Yoonphil Eo

Yongsu Kim

Youngnam Kwon

Youngsuk Jung

Boksoon Kwon

Jaewoo Kam

Junho Yun

Jae Shik Yoo

A composite cathode active material and a cathode and a lithium battery including the composite cathode active material. The composite cathode active material has a core including a plurality of primary particles including a nickel-containing first lithium transition metal oxide having a layered crystal structure; a grain boundary disposed between adjacent primary particles of the plurality of primary particles; and a shell on the core, the shell including a second lithium transition metal oxide having a spinel crystal structure, wherein the grain boundary includes a first composition having a spinel crystal structure.

Composite cathode active material, cathode and lithium battery including the same, and method of preparing the composite cathode active material

A charging control device includes: a battery state detector configured to detect a cell voltage of at least one cell of a battery and a charging current between the battery and a charging device; and a controller configured to perform a cell over voltage protection (COVP) function on the battery based on a cell over voltage protection voltage, and to vary the cell over voltage protection voltage in response to the charging current.

Charging control device and method

A composite separator, a method of preparing the composite separator, and a secondary battery including the composite separator are provided. The composite separator includes a heat-resistant nonwoven fabric, and a porous coating film on at least one surface of the heat-resistant nonwoven fabric and including a multi-phase polymer including a stationary phase segment and a reversible phase segment, wherein an amount of the stationary phase segment is larger than an amount of the reversible phase segment.

Composite separator, method of preparing the same, and secondary battery including the same

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Seoul, South Korea

Dongsu Ko