Lg Chem, Ltd

Jae Bin Chung

Joon Sung Bae

Chang-Wan Koo

Dong-Myung Kim

Byung Chun Park

Byoung Hoon Ahn

Eun Seok Choi

Soo Jung Kim

Shin Hyo Cho

Moon Kyu Cho

Byung Ouk Park

Disclosed herein are an electrode stack including at least one positive electrode, at least one negative electrode, and at least one separator, wherein the positive electrode, the negative electrode, and the separator are stacked such that the separator is disposed between the positive electrode and the negative electrode, one end of each of the positive electrode and the negative electrode does not intersect the other end of each of the positive electrode and the negative electrode, a stacked surface of each of the positive electrode, the negative electrode, and the separator includes a curved surface, and the negative electrode has an arc length equal to or greater than that of the positive electrode while the separator has an arc length greater than that of the positive electrode in a state in which the positive electrode, the negative electrode, and the separator are curved, and a battery pack including the same.

Curved electrode stack and battery pack including the same

Disclosed is an anode active material for lithium secondary batteries that includes natural graphite particles consisting of spherical particles of agglomerated graphite sheets, outer surfaces of which are not coated with a carbon-based material, wherein the surfaces of the particles have a degree of amorphization of at least 0.3 within a range within which an R value [R=I/I] (Iis the intensity of Raman around 1350 cmand Iis the intensity of Raman around 1580 cm) of a Raman spectrum is in the range of 0.30 to 1.0.

Lithium secondary battery comprising spherical graphite as anode active material

Disclosed are a cathode active material for secondary batteries and a lithium secondary battery including the same. More particularly, a cathode active material for secondary batteries having an operating voltage area of 2.50 V to 4.35 V, including a lithium cobalt-based oxide and a surface-treated lithium nickel-based oxide and having high rolling density by a bimodal form in which an average diameter of the cobalt-based oxide and an average diameter of the lithium nickel-based composite oxide are different, and a lithium secondary battery including the same are disclosed.

Cathode active material for secondary battery and lithium secondary battery comprising the same

Disclosed is a cathode active material for secondary batteries in which a carboxymethyl cellulose derivative is coated on surfaces of particles of a lithium transition metal oxide having the formula LiMOwhere M: NiMnCowherein 0&#x2266;a&#x2266;0.9, 0&#x2266;b&#x2266;0.9, 0&#x2266;c&#x2266;0.5, and 0.85&#x2266;a+b+c&#x2266;1.05 and x+y=2, wherein 0.95&#x2266;x&#x2266;1.15.

Cathode active material and lithium secondary battery comprising same

Disclosed herein are an electrode stack including at least one positive electrode, at least one negative electrode, and at least one separator, wherein the separator is laminated to one surface or opposite surfaces of at least one of the electrodes, the positive electrode, the negative electrode, and the separator are stacked such that the separator is disposed between the positive electrode and the negative electrode, and a stacked surface of each of the positive electrode, the negative electrode, and the separator includes a curved surface, and a battery cell including the same.

Curved electrode stack and battery cell including the same

Disclosed are an electrode assembly for secondary batteries and a lithium secondary battery including the same. More particularly, an electrode assembly including a cathode, an anode and a separator, wherein the cathode includes a lithium cobalt-based oxide, and a lithium nickel-based composite oxide forming a coating layer over a surface of the lithium nickel-based composite oxide by reacting with a fluorine-containing polymer, as a cathode active material, the anode includes carbon and a silicon oxide as an anode active material, an operating voltage is 2.50 V to 4.35 V, and the cathode active material has high rolling density by a bimodal form in which an average diameter of the cobalt-based oxide and an average diameter of the lithium nickel-based composite oxide are different, and a lithium secondary battery including the same are disclosed. In addition, an electrode assembly including a lithium cobalt-based oxide surface-coated with alumina (AlO), and a lithium secondary battery including the same are disclosed.

Electrode assembly for secondary batteries and lithium secondary battery including the same

Disclosed is a lithium secondary battery that includes an anode coated with an anode mixture including an anode active material, a cathode coated with a cathode mixture including a cathode active material, and a non-aqueous electrolyte, wherein the anode mixture includes, as aqueous binders, carboxymethyl cellulose (CMC) having a degree of substitution of a hydroxyl group (&#x2014;OH) with a carboxymethyl group (&#x2014;CHCOH) of 0.7 to 1.2, a molecular weight (Mn) of 500,000 to 900,000, and a pH of 6.5 to 8.0 and styrene-butadiene rubber (SBR) having a particle diameter of 90 nm to 150 nm and a tensile strength of 90 kgf to 160 kgf, and the anode has an electrode coating amount of 10 to 20 mg/cmand that enhances electrode processability and reduces a swelling phenomenon.

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Daejeon, South Korea

Jae Bin Chung