Abstract: Provided are a method of preparing a metal oxide-silica composite aerogel, which includes preparing metal oxide-silica composite precipitates by adding a metal salt solution to a silicate solution and performing a reaction, and washing the metal oxide-silica composite precipitates with a washing solvent having a surface tension at 20±5° C. of 30 mN/m or less and drying the washed metal oxide-silica composite precipitates, and a metal oxide-silica composite aerogel having increased specific surface area and pore properties as well as tap density, which is significantly reduced by a maximum of 78.6% in comparison to a composite aerogel prepared by using water as a typical washing solvent, prepared by the method.

Abstract: Disclosed is a method for manufacturing a separator for an electrochemical device. The method contributes to formation of a separator with good bondability to electrodes and prevents inorganic particles from detaching during an assembling process of an electrochemical device.

Abstract: A photonic radiator device forming a photonic phased array antenna includes a light waveguide including a waveguide clad and a waveguide core using a semiconductor material, and a grating periodically formed an upper or lower part of the light waveguide. The photonic radiator device receives an input light wave in a direction of the grating and the light waveguide and radiates an output light wave to a space by using scattering from the grating.

Abstract: The present invention relates to a method of preparing a metal oxide-silica composite aerogel having a uniform particle size and excellent pore characteristics and a metal oxide-silica composite aerogel prepared thereby. The preparation method according to the present invention may not only have good economic efficiency because production costs are relatively reduced in comparison to the related art, but may also effectively prevent the collapse of a pore structure by suppressing a shrinkage phenomenon during drying. Thus, a metal oxide-silica composite aerogel prepared by the above preparation method may have higher specific surface area and better pore characteristics than a conventional metal oxide-silica composite aerogel prepared by oven drying while having low tap density.

Abstract: A method for producing a plate type metal-silica composite aerogel and a plate type metal-silica composite aerogel produced thereby in which the metal salt concentration and the basic catalyst concentration are adjusted to form a plate type intermediate first, and then an appropriate amount of a water glass solution is added, thereby enabling the plate type metal-silica composite aerogel to be produced in a short time under conditions of low temperature and atmospheric pressure, so that the process is simpler than the conventional production method, and the cost is reduced, which is excellent in economy. Also provided is a plate type metal-silica composite aerogel, which is produced by the claimed method and has excellent dispersibility that requires no additional surface modifier.

Abstract: Disclosed is a negative electrode active material including artificial graphite having a large particle diameter and natural graphite having a small particle diameter, wherein the average particle diameter ratio of the small particle and the large particle is 1:1.5-1:5. A secondary battery including the negative electrode active material is also disclosed.

Abstract: The present invention relates to a separator for a secondary battery which is capable of improving a shut-down function of a cellulose-based multilayer separator physically having high strength. The separator for a secondary battery comprises a substrate formed of cellulose-based nanofibers and polyethylene nanoparticles; and a resin layer stacked on one surface or both surfaces of the substrate, the resin being formed from a polyolefin.

Abstract: The present invention relates to a method of preparing a metal oxide-silica composite aerogel containing a high ratio of a metal oxide and a metal oxide-silica composite aerogel prepared thereby. The method of preparing a metal oxide-silica composite aerogel according to the present invention may adjust a metal oxide ratio to a high level while easily forming a uniform network structure by performing a primary reaction under an acidic condition and a secondary reaction under a basic condition, and thus, since the prepared metal oxide-silica composite aerogel may contain a high ratio of the metal oxide, mechanical properties may not only be excellent, but high specific surface area and low tap density characteristics may also be exhibited.

Abstract: The present invention provides a battery cell of a plate shape, including: an electrode assembly in which a separator is interposed between a positive electrode and a negative electrode, wherein the electrode assembly may be mounted on a receiving part; and sealing parts formed by heat fusion at an external side of the receiving part, wherein lateral sealing parts adjacent to one of the sealing parts at which an electrode terminal is positioned may closely contact an outer surface of the receiving part while being bent toward the receiving part of a battery case, and a phase change material (PCM) that is phase-changed in response to a thermal change may be added to surplus surfaces of the lateral sealing parts or to surplus spaces between the receiving parts and the bent lateral sealing parts.

Abstract: Disclosed are a nuclear fuel pellet having enhanced thermal conductivity and a method of manufacturing the same, the method including (a) a step of manufacturing a mixture including a nuclear fuel oxide powder and a thermally conductive plate-shaped metal powder; and (b) a step of molding and then heat-treating the thermally conductive plate-shaped metal powder to have an orientation in a horizontal direction in the mixture, thereby forming a pellet.

Abstract: Provided is a method of preparing a metal oxide-silica composite aerogel and a metal oxide-silica composite aerogel having an excellent weight reduction property prepared by the method. The method comprises adding an acid catalyst to a first water glass solution to prepare an acidic water glass solution (step 1); adding a metal ion solution to the acidic water glass solution to prepare a precursor solution (step 2); and adding a second water glass solution to the precursor solution and performing a gelation reaction (step 3).

Abstract: Provided are a method of preparing a metal oxide-silica composite aerogel, which includes preparing metal oxide-silica composite precipitates by adding a metal salt solution to a silicate solution and performing a reaction, and drying the metal oxide-silica composite precipitates by irradiation with infrared rays in a wavelength range of 2 ?m to 8 ?m, and a metal oxide-silica composite aerogel having excellent physical properties, such as low tap density and high specific surface area, as well as excellent pore properties prepared by the method.

Abstract: The present invention relates to a method for producing synthetic hectorite at a low temperature and atmospheric pressure and synthetic hectorite produced by the same, and more particularly, to a method for producing synthetic hectorite and synthetic hectorite produced by the same in which: a step of forming Li—Mg precipitates is introduced and thereby ensures an improved crystallization reaction condition and synthetic hectorite having excellent properties; and composition ratios of reactants are controlled, and thus, property control is easy.

Abstract: The present invention provides a method of preparing a separator for a lithium secondary battery, comprising: forming a porous coating layer on at least one surface of a porous substrate, the porous coating layer comprising inorganic particles; bringing polymer particles into electric charging to obtain electrically charged polymer particles; transferring the electrically charged polymer particles on the top surface the porous coating layer to form a functional coating layer; and fixing the functional coating layer with heat and pressure, a separator prepared by the method, and a lithium secondary battery comprising the separator.

Abstract: The present invention relates to a method of preparing a hydrophobic metal oxide-silica composite aerogel having a high specific surface area and a low tap density and a hydrophobic metal oxide-silica composite aerogel prepared thereby. Thus, the preparation method may not only have excellent productivity and economic efficiency due to a relatively simpler preparation process and shorter preparation time than the related art, but may also prepare a hydrophobic metal oxide-silica composite aerogel having a high specific surface area and a low tap density.

Abstract: The present invention relates to a method for producing potassium titanate, and the present invention provides a method for producing potassium titanate which uses anatase-phased titanium dioxide to simplify the process by a hydrothermal method, and thus may improve economical efficiency and productivity, and in which the reaction temperature, the reaction time and the molar ratio of a precursor may be controlled to produce a high-purity potassium titanate whisker having a nano size of an uniform shape.

Abstract: The present invention provides a method for manufacturing a separator, comprising the steps of (S1) preparing a porous planar substrate having multiple pores; (S2) coating a coating solution obtained by dissolving a binder polymer in a solvent and dispersing inorganic particles therein on the porous substrate to form a porous coating layer and drying the porous coating layer; and (S3) applying a binder solution on the surface of the dried porous coating layer to form an adhesive layer, wherein the binder solution has a surface energy of at least 10 mN/m higher than that of the porous coating layer and a contact angle of the binder solution to the surface of the porous coating layer maintained at 80° or more for 30 seconds. In accordance with the present invention, a separator capable of obtaining sufficient adhesion force with minimizing the amount of an adhesive used for the adhesion with an electrode, and minimizing the deterioration of battery performances can be easily manufactured.

Abstract: The present invention relates to a low-temperature/atmospheric-pressure method for producing synthetic hectorite and synthetic hectorite produced using the same, and more particularly, provides a method for producing synthetic hectorite at a low temperature and atmospheric pressure and synthetic hectorite produced using the same such that: a crystallization reaction may be carried out under a low-temperature/atmospheric-pressure condition by introducing a step of forming a precipitate and using a weak basic catalyst when the Li—Mg precipitates are formed; a reaction time may be reduced; synthetic hectorite with excellent major application properties may be prepared; and the properties may be easily controlled by controlling a composition ratio of a reactant.

Abstract: A pouch type secondary battery includes an electrode assembly and a pouch sheath material including a first pouch portion and a second pouch portion. The pouch-type secondary battery includes dual electrode leads wherein a first electrode lead is attached to the first pouch portion and a second electrode lead is attached to the second pouch portion. In the pouch-type secondary battery, electric current is interrupted by using a volumetric swelling phenomenon caused by swelling or pressure generated upon overcharge so that the battery may be prevented from being further charged. In addition, when pressure is increased by an additional reaction, venting occurs toward the inner lead portion of each of the dual electrode leads. As a result, it is possible to increase the stability of a battery cell, module and a pack received in the pouch, and thus to improve the life of a battery.

Abstract: A waveguide having a bi-directional optical transmission structure comprises: a main waveguide which is formed in a preset direction; a branch waveguide which is connected to at least one of both ends of the main waveguide; and a reflector which is placed at an intersection where the branch waveguide and the at least one of both ends of the main waveguide are connected, and which has a different refraction index from the refraction index of the main waveguide and the refraction index of the branch waveguide, wherein the reflector refracts or reflects in different forms the bidirectional light signals for transmission and reception, and thereby directs the light signal for transmission to the main waveguide, and separates the light signal for reception to the branch waveguide.