Samsung Sdi Co., Inc.

Jungjoon Park

Ickkyu Choi

Young-Ki Kim

Soonrewl Lee

Youngjoo Chae

Soonkie Hong

Mingzi Hong

Kitae Kim

Yangseob Kim

Hyeonsun Choi

Sam-Jin Park

Dongwan Seo

Jinkyu Park

Dong-Hwan Yu

Kisoo Lee

Changhong Ko

Suho Song

Hyerim Lee

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 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

A positive electrode active material for a lithium secondary battery, the material represented by the formulas: LiNiCoAlOor LiNiCoMnO(0.1&#x3c;x&#x2266;0.15 and 0.03&#x3c;y&#x3c;0.1), and whose X-ray diffraction peak intensity ratio 1(2&#x3b8;=45 degrees)/I(2&#x3b8;=18 degrees) of an X-ray diffraction peak intensities found in the vicinity of an X-ray diffraction-scanning angle 2&#x3b8; of about 45 degrees, to an X-ray diffraction peak intensity found in the vicinity of an X-ray diffraction-scanning angle 2&#x3b8; of about 18 degrees, is in the range of from 46% to 51%. The positive electrode active material is fabricated by mixing NiCoAlOor NiCoMnO(0.1&#x3c;x&#x2266;0.15 and 0.03&#x3c;y&#x3c;0.1) with lithium hydrates (LiOH.HO); and calcinating the mixture at a temperature of 750&#xb0; C., for more than 30 hrs, under an oxygen atmosphere.

Growing community of inventors

Yongin-si, South Korea

Jungjoon Park