SK Innovation

A refrigeration oil composition according to embodiments of the present disclosure includes a silane compound represented by Formula 1 below, wherein any one or two of R₁ to R₄ are each independently selected from C₁-C₅ alkoxy groups, and the remaining groups are each independently C₁-C₁₄ alkyl groups.

A cathode active material for a lithium secondary battery according to the present disclosure includes lithium-metal oxide particles and a coating part formed on the lithium-metal oxide particles and including a metal-containing part and a sulfur-containing part. A metal area ratio of the cathode active material according to a specific equation may fall within a predetermined range. Accordingly, side reactions between the cathode active material and the electrolyte may be suppressed, and the stability and cycle life characteristics of the secondary battery may be improved.

A cathode active material for a lithium secondary battery according to exemplary embodiments of the present disclosure includes lithium metal oxide particles and a sulfur (S)-containing compound and a sodium (Na)-containing compound present on the surface or inside the lithium metal oxide particles. The surface portion of the lithium metal oxide particle has a concentration gradient of sulfur (S). The absolute value of the slope of the XPS signal of sulfur (S) in the surface portion is 20 cps/nm to 80 cps/nm.

An anode for a secondary battery includes an anode current collector, and an anode active material layer disposed on a surface of the anode collector and including an alcohol. In a 1H NMR analysis of the anode active material layer, a sum of a peak area of a first peak observed in a range of 4 ppm to 4.5 ppm and a peak area of a second peak observed in a range of 3.5 ppm to 4 ppm is greater than 0, and 0.15 or less. A peak area of a third peak observed in a range of 1.5 ppm to 2 ppm is greater than 0, and 0.15 or less. A peak area of a fourth peak observed in a range of 1 ppm to 1.5 ppm is greater than 0, and 0.8 or less.

Disclosed is an immersion cooling module and an immersion cooling method. The immersion cooling module includes a housing (10) configured to contain a cooling fluid at a predetermined level and to accommodate one or more battery cells (20) that are disposed to be at least partially immersed in the cooling fluid. The housing (10) has a first end inlet (11) and a second end inlet (12) at opposite sides, respectively. The module further includes: a connection pipe (30) separately coupled below the housing (10), extending from the first end inlet (11) to the second end inlet (12), a connection conduit (41, 42, 43, 44) formed on a lower surface of the housing (10) for each of cooling spaces (L1, L2, L3, L4), with the spaces (L1, L2, L3, L4) being divided by the battery cell(s), so that the cooling fluid is flowable between the spaces and the connection pipe (30); a heat exchanger (50) coupled to the connection pipe (30) and having a cooling fluid outlet formed therein, and a fluid pump (61, 62) coupled to the connection pipe (30) and configured to control a flow direction of the cooling fluid toward the first side and the second side of the heat exchanger (50).

A system, a use of said system, and a method for manufacturing and drying of one or more electrodes for a secondary battery are disclosed. The system (1) includes a coating portion (30) adapted to apply a coating material (6) to a coating substrate (5) travelling along a path; and a drying portion (40) adapted to dry the coating material (6), wherein the drying portion (40) includes at least one Coanda nozzle (71) that is adapted to spray hot air onto one surface of the coating substrate (5), and wherein the Coanda nozzle (71) includes at least one hot-air blocker (90) that is adapted to selectively block a spray port through which hot air is sprayable.

A cathode active material for a secondary battery according to one embodiment of the present disclosure includes a lithium metal oxide and has a C-axis lattice retention ratio (R<CL>) of 95% to 97%, as defined by Equation 1 below. R CL = C min / C max × 100 <img class="EMIRef" id="51ee46e0-3fd6-40b8-ad8e-5f161359beda-ia01" /> in Equation 1, R<CL> denotes the C-axis lattice retention ratio, and C<min> and C<max> respectively denote the minimum and maximum values of the C-axis lattice constant of the cathode active material, as observed by X-ray diffraction (XRD) analysis while the charge voltage is increased to a terminal voltage.

A catalyst for a Fischer-Tropsch (FT) reaction, which includes a composite carrier containing uniformly dispersed alumina and zeolite and a metal uniformly supported on the composite carrier. Herein, the metal includes Co. The catalyst leads to improved product selectivity. In addition, a method of preparing said catalyst is described.

A copolymer for an anion exchange membrane including a repeating unit represented by Formula 1 below and an anion exchange membrane including the copolymer are provided.in Formula 1, M₁, M₂, L₁, L₂, x and y refer to the definitions as defined herein.

Proposed is an immersion cooling module including a housing (10) in which an inlet (11) for cooling fluid to flow in and an outlet (12) for cooling fluid to flow out are formed, and in which the cooling fluid is accommodated at a predetermined level so as to form an upper space, a cooling chamber (20) coupled to a lower end of the housing (10), and configured to have a chamber inlet (21) through which the cooling fluid flows in and a chamber outlet (22) through which the cooling fluid is discharged, battery cells spaced apart from each other and immersed in the cooling fluid, and cooling fluid passage parts respectively formed in cooling spaces divided by the battery cells, wherein heat transfer members are arranged at predetermined intervals in a direction perpendicular to a flow direction of the cooling fluid.