Samsung Sdi Co., Inc.

Ickkyu Choi

Young-Ki Kim

Soonrewl Lee

Jungjoon Park

Soonkie Hong

Mingzi Hong

Youngjoo Chae

Kitae Kim

Young-Hun Lee

Hyun Soh

Yangseob Kim

Hyeonsun Choi

Sam-Jin Park

Jinkyu Park

Dongwan Seo

Heeyoung Chu

Yungu Cho

Doori Oh

Changhong Ko

Dong-Hwan Yu

Kisoo Lee

Hyerim Lee

Jiyeon Jang

Yoonyoung Choi

A composite anode and a secondary battery including the same are disclosed. The composite anode includes a silicon-containing structure; a first carbon material; a second carbon material; and a conductive material, wherein the first carbon material has a specific surface area (BET) value of 1.5 m/g or less, a rate of change of the specific surface area (m/g) to an increase in particle size (μm) is −0.07 to −0.04 m/μm·g, and an area occupied by pores in a cross-section of the first carbon material is 10% or less.

Composite anode, and lithium secondary battery comprising the same

A positive active material for a rechargeable lithium battery includes a first compound represented by Chemical Formula 1, and a second compound having a smaller particle diameter than the first compound and represented by Chemical Formula 2, wherein the first compound and the second compound have a Ni content of about 50 at % to about 60 at % based on a total amount of metal elements excluding Li. A rechargeable lithium battery including the first compound and the second compound satisfies Relation 1:V&#x3c;V&#x2264;3.6.&#x2003;&#x2003;[Relation 1]In Relation 1, Vis a voltage value at a point where a tangent line to a value corresponding to 50% of the first peak value intersects the line dQ/dV=0, and Vis a charge start voltage, as determined from a differential capacity (dQ/dV)-voltage charge/discharge plot.

Positive active material 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 and having a smaller particle diameter than the first compound, wherein at least one of the first compound and the second compound includes a core and a surface layer surrounding the core:LiNiCoMO,&#x2003;&#x2003;Chemical Formula 1LiNiCoMO,&#x2003;&#x2003;Chemical Formula 2wherein Mand Mare each independently at least one selected from Mn, Al, Cr, Fe, V, Mg, Ti, Zr, Nb, Mo, W, Cu, Zn, Ga, In, Sn, La, and Ce. The atomic concentration (at %) of nickel (Ni) with respect to the total amount of non-lithium metals is higher in the surface layer than in the core, and an amount of cation mixing is less than or equal to about 3%.

A positive active material for a rechargeable lithium battery includes a nickel-based lithium transition metal oxide including a secondary particle in which a plurality of primary particles are agglomerated, wherein the secondary particle includes a core and a surface layer surrounding the core, and the surface layer includes a plurality of primary particles and a nano-sized cobalt-based lithium transition metal oxide absorbed in the surface layer, between the primary particles.

The present invention relates to a separator for a secondary battery and a lithium secondary battery including the separator, the separator including: a porous substrate and a heat-resistant layer disposed on at least one surface of the porous substrate, wherein the heat-resistant layer includes an acrylic heat-resistant binder, an adhering binder, and a filler, the acrylic heat-resistant binder including a structural unit derived from (meth)acrylate or (meth)acrylic acid, a cyano group-containing structural unit, and a sulfonate group-containing structural unit, the adhering binder includes a structural unit including a structural unit including hydroxyl group, a structural unit including an acetate group, and a structural unit including an alkali metal.

Separator for secondary battery and lithium secondary battery comprising same

A positive active material for use in a positive electrode and a rechargeable lithium battery includes a lithium cobalt oxide including a secondary particle having an average particle diameter of about 15 &#x3bc;m to about 25 &#x3bc;m, wherein the secondary particle includes a plurality of primary particles having an average particle diameter of about 2 &#x3bc;m to about 10 &#x3bc;m, and the positive active material has a pellet density of greater than or equal to about 3.80 g/cm. A method of manufacturing the positive active material includes heat-treating a cobalt-containing compound at a temperature of greater than or equal to about 900&#xb0; C. to form a cobalt oxide comprising CoOand CoO, and reacting the cobalt oxide with a lithium compound to prepare the lithium cobalt oxide.

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

A positive active material for a rechargeable lithium battery, and a rechargeable lithium battery and a battery module including the same are provided. The positive active material may include a lithium nickel-manganese-cobalt composite oxide with a coating layer on the surface. The coating layer on the surface may include a lithium oxide including Al and/or W, for example, Al and W.

Positive electrode for rechargeable lithium battery, rechargeable lithium battery including same and battery module

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Yongin-si, South Korea

Ickkyu Choi