Sk on Co., Ltd.

Sk Innovation Co., Ltd.

Yong Hyun Cho

Min Gu Kang

Young Hoon Do

Soo Ho Kim

Sang Han Lee

Jeong Bae Yoon

Yoon Ji Lee

In Haeng Cho

Byoung Beom Lim

Sang Wook Lee

Min Suk Kang

Jae Woong Kim

Whee Sung Kim

Jeong Hoon Jeun

A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer including a first cathode active material layer and a second cathode active material layer sequentially stacked on the cathode current collector. The first cathode active material layer includes first cathode active material particles having a secondary particle structure, and the second cathode active material layer includes second cathode active material particles having a single particle shape. A ratio of a SPAN value of the second cathode active material particles relative to a SPAN value of the first cathode active material particles is in a range from 2 to 4.5.

Cathode for lithium secondary battery and lithium secondary battery including the same

Provided is a lithium secondary battery, and the lithium secondary battery of the present invention includes: a positive electrode including a first lithium-metal oxide including secondary particles formed by aggregating primary particles having a particle diameter of 2 μm or less and a second lithium-metal oxide including nickel and at least one or more metals selected from the group consisting of manganese (Mn) and cobalt (Co) and including particles having a primary particle diameter of 2 μm or more; a negative electrode; a separator interposed between the positive electrode and the negative electrode; and an electrolyte, wherein the electrolyte includes a lithium salt, a nonaqueous organic solvent, and a difluorophosphite compound containing at least one or more difluorophosphite groups.

Lithium secondary battery

A cathode active material for a lithium secondary battery including a lithium-transition metal composite oxide particle is provided. A crystal grain size of the lithium-transition metal composite oxide particle measured by an XRD analysis is 250 nm or more, and an XRD peak intensity ratio of the lithium-transition metal composite oxide particle is 9.8% or less. A lithium secondary battery including the lithium-transition metal composite oxide particle and having improved life-span and rate capability is provided.

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

A lithium secondary battery comprises a cathode, an anode, a separator and a nonaqueous electrolyte solution. The cathode includes a first cathode active material in which at least one of metals included in the first cathode material has a concentration gradient region between a central portion and a surface portion, and a second cathode active material having a single particle structure. The lithium secondary battery has improved life-span and penetration stability.

A positive electrode active material may include a lithium layer doped with a first doping element and a transition metal layer doped with a second doping element. An I(003)/I(006) peak intensity ratio in X-ray diffraction measurement is equal to or less than 23.8.

Positive electrode active material, manufacturing method thereof, and positive electrode for lithium secondary battery comprising the same

A lithium secondary battery according to an embodiment of the present invention includes an electrode assembly including a separation layer, and a plurality of cathodes and a plurality of anodes separated by the separation layer and repeatedly stacked, and a gas adsorption layer coated on a single surface of an outermost anode among the plurality of anodes.

A cathode active material for a lithium secondary battery includes a lithium-transition metal composite oxide particle having a lattice strain (η) of 0.18 or less, which is calculated by applying Williamson-Hall method defined by Equation 1 to XRD peaks measured through XRD analysis, and having an XRD peak intensity ratio of 8.9% or less, which is defined by Equation 2. By controlling the lattice strain and XRD peak intensity ratio of the lithium-transition metal composite oxide particle, a lithium secondary battery with improved life-span characteristics as well as output characteristics is provided.

A cathode for a lithium secondary battery according to an embodiment of the present invention includes a cathode current collector, and a cathode active material layer on the cathode current collector. The cathode active material layer includes cathode active material particles. The cathode active material particles include first lithium metal oxide particles having a shape of a secondary particle in which a plurality of primary particles are aggregated, and second lithium metal oxide particles having a shape of a single particle. A closed pore ratio of the cathode active material layer is 5% or less.

Cathode for lithium secondary battery, lithium secondary battery including the same and method of fabricating lithium secondary battery

A lithium secondary battery includes a cathode formed from a cathode active material including a first cathode active material particle and a second cathode active material particle, an anode and a separation layer interposed between the cathode and the anode. The first cathode active material particle includes a lithium metal oxide in which at least one metal forms a concentration gradient. The second cathode active material particle includes primary particles having different shapes or crystalline structures from each other.

Provided is a lithium secondary battery, and the lithium secondary battery of the present invention includes: a positive electrode including a first lithium-metal oxide including secondary particles formed by aggregating primary particles having a particle diameter of 2 &#x3bc;m or less and a second lithium-metal oxide including nickel and at least one or more metals selected from the group consisting of manganese (Mn) and cobalt (Co) and including particles having a primary particle diameter of 2 &#x3bc;m or more; a negative electrode; a separator interposed between the positive electrode and the negative electrode; and an electrolyte, wherein the electrolyte includes a lithium salt, a nonaqueous organic solvent, and a difluorophosphite compound containing at least one or more difluorophosphite groups.

A cathode active material for a lithium secondary battery includes a lithium-transition metal composite oxide particle having a lattice strain (&#x3b7;) of 0.18 or less, which is calculated by applying Williamson-Hall method defined by Equation 1 to XRD peaks measured through XRD analysis, and having an XRD peak intensity ratio of 8.9% or less, which is defined by Equation 2. By controlling the lattice strain and XRD peak intensity ratio of the lithium-transition metal composite oxide particle, a lithium secondary battery with improved life-span characteristics as well as output characteristics is provided.

A lithium secondary battery includes a cathode formed from a cathode active material including a first cathode active material particle and a second cathode active material particle, an anode and a separation layer interposed between the cathode and the anode. The first cathode active material particle includes a lithium metal oxide including a concentration gradient and has a secondary particle structure formed from an assembly of primary particles. The second cathode active material particle includes a lithium metal oxide having a single particle structure. The first and second cathode active material particles each includes at least two metals except from lithium, and an amount of nickel is the largest among those of the metals in each of the first and second cathode active material particles.

Lithium secondary battery and method of manufacturing the same

A lithium secondary battery includes a plurality of electrode cells, each of which includes a first electrode, a second electrode having a different polarity from that of the first electrode and a separation layer interposed between the first electrode and the second electrode, and at least one ion permeation barrier between neighboring ones of the electrode cells. The ion permeation barrier has an air permeability less than that of the separation layer.

Growing community of inventors

Daejeon, South Korea

Yong Hyun Cho