Lg Chem, Ltd

Sin Kyu Kim

Geun Chang Chung

Song Taek Oh

Sun Jung Hwang

Jae Hyun Lee

Hyun Kuk Noh

Won Hee Jeong

Sung Kyun Chang

Min Hee Lee

Sin Young Park

Yong Tae Lee

Song-Taek Oh

Geun-Chang Chung

Sun Kyu Kim

Jung Seok Choi

Jong Chan Kim

Hyun Seok Lee

Seung Ryul Choi

Su Hwan Kim

Jin Hyung Lim

Sang Uck Lee

Keun Wan An

KeunWan An

Bong Kook Youn

Sanguck Lee

Min Sun Cho

Kyungkoo Lee

Provided is a composite electrode for a lithium secondary battery for improving output and a lithium secondary battery including the composite electrode, in which, in a composite electrode having two or more active materials mixed therein, an active material having a small particle size is included in the composite electrode by being coagulated and secondarily granulated so as to allow mixed active material particles to have a uniform size, and thus, electrical conductivity is improved to have high output characteristics.

Active material for lithium secondary battery composite electrode for improving output and lithium secondary battery including the active material

Disclosed is a positive electrode for secondary batteries manufactured by coating and rolling a slurry for a positive electrode mix including positive electrode active material particles on a current collector, wherein the positive electrode active material particles include one or more selected from the group consisting of lithium iron phosphate particles having an olivine crystal structure and lithium nickel-manganese-cobalt composite oxide particles according to Formula 1, the lithium nickel-manganese-cobalt composite oxide particles existing as secondary particles formed by agglomeration of primary particles, in an amount of greater than 50% and less than 90% based on the total volume of lithium nickel-manganese-cobalt composite oxide, and the lithium iron phosphate particles existing as primary particles in an amount of greater than 50% and less than 100% based on the total volume of lithium iron phosphate (Formula 1 is the same as defined in Claim).

Positive electrode for secondary batteries and secondary battery including the same

Disclosed herein is a lithium secondary battery including a positive electrode including lithium iron phosphate and layered lithium nickel manganese cobalt oxide as a positive electrode active material and a negative electrode including a negative electrode active material having a potential difference of 3.10 V or higher from the lithium iron phosphate at a point of 50% state of charge (SOC) afforded by the entirety of the lithium iron phosphate.

Secondary battery

Disclosed herein is a cathode active material including a lithium manganese oxide, in which the lithium manganese oxide has a spinel structure with a predetermined constitutional composition represented by Formula 1 described in the detailed description, wherein a conductive material is applied to the surface of lithium manganese oxide particles, so as to exhibit charge-discharge properties in the range of 2.5 to 3.5V as well as in the 4V region.

Cathode active material comprising lithium manganese oxide capable of providing excellent charge-discharge characteristics at 3V region as well as 4V region

A high capacity lithium secondary battery includes a lithium manganese oxide having a layered structure exhibiting a great irreversible capacity in the event of overcharging at a high voltage and a spinel-based lithium manganese oxide. Because it is activated at a high voltage of 4.45 V or higher based on a positive electrode potential, additional lithium for utilizing a 3V range of the spinel-based lithium manganese oxide can be provided and an even profile in the entire SOC area can be obtained. Because the lithium secondary battery includes the mixed positive electrode active material including the spinel-based lithium manganese oxide and the lithium manganese oxide having a layered structure, and is charged at a high voltage, its stability can be improved. Also, the high capacity battery having a large available SOC area and improved stability without causing an output shortage due to a rapid voltage drop in the SOC area can be implemented.

Positive electrode active material with high capacity and lithium secondary battery including the same

Provided are a positive electrode active material for improving an output and a lithium secondary battery including the same. Particularly, graphite and conductive carbon which have shapes and sizes different from each other, may be simultaneously coated on a mixed positive electrode material of a 3-component system lithium-containing metal oxide having a layered structure and expressed as following Chemical Formula 1 and LiFePOhaving an olivine structure as an conductive material to improve high resistance occurrence and conductivity reduction phenomenon of a 3-component system lithium metal oxide due to a difference between particle sizes and surface areas of the 3-component system lithium-containing metal oxide and LiFePOolivine.LiNiCoMnO, 0&#x2266;&#x3c;0.5, 0&#x3c;&#x3c;1, 0&#x3c;&#x3c;0.5&#x2003;&#x2003;[Chemical formula 1]

Lithium secondary battery positive electrode material for improving output characteristics and lithium secondary battery including the same

An object of the present invention is a cathode active material including a lithium manganese-based oxide. The lithium manganese-based oxide has a spinel structure, exhibits core-shell phase transition by which phase transition of a crystal structure occurs from a cubic structure to a tetragonal structure in a direction from the surface of particles to the center of the particles during discharging to the 3V region, and includes a conductive material at the shell to improve electrical conductivity of the tetragonal structure.

Cathode active material with high capacity and improved conductivity and non-aqueous electrolyte secondary battery comprising the same

Growing community of inventors

Daejeon, South Korea

Sin Kyu Kim