Abstract: An electrolyte for a secondary battery is provided. The electrolyte for a secondary battery according to an embodiment of the present invention comprises: a non-aqueous organic solvent including propyl propionate (PP) and ethyl propionate (EP); a lithium salt; and an additive. The lithium salt is contained in a concentration of 0.6-1.6 M. Accordingly, when the electrolyte is applied to a battery and a flexible battery, excellent discharge performance can be exhibited in extremely low temperature and high temperature. In addition, the flexible battery of the present invention can prevent or minimize the deterioration of physical properties required as a battery even if repeated bending occurs. Such an electrolyte for a secondary battery of the present invention can be applied to various fields which require high discharge capacity at extremely low temperature and high temperature.

Abstract: A method of manufacturing a rechargeable battery pouch having three sealed sides, an apparatus for manufacturing the same, and a rechargeable battery manufactured thereby in which a pouch film may be bent, and an uneven portion may then be formed in a bent portion by using a bending knife, thereby reducing a gap between a lower end of the pouch film and an electrode assembly when the electrode assembly is accommodated in the pouch film. In this manner, it is possible to reduce a size of a bat-ear shaped fold to increase a contact area between the battery pouch and a cooling plate, and improve a space efficiency of the rechargeable battery.

Abstract: A ceramic-polymer film includes a polymer matrix; a plasticizer; a lithium salt; and AlxLi7-xLa3Zr1.75Ta0.25O12 where x ranges from 0.01 to 1 (LLZO), wherein the LLZO are nanoparticles with diameters that range from 20 to 2000 nm and wherein the film has an ionic conductivity of greater than 1×10?3 S/cm at room temperature. The nanocomposite film can be formed on a substrate and the concentration of LLZO nanoparticles decreases in the direction of the substrate to form a concentration gradient over the thickness of the film. The film can be employed as a non-flammable, solid-state electrolyte for lithium electrochemical cells and batteries. The LLZO serves as a barrier to dendrite growth.

Abstract: A positive electrode active material in which a capacity decrease caused by charge and discharge cycles is suppressed is provided. Alternatively, a positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. The positive electrode active material contains titanium, nickel, aluminum, magnesium, and fluorine, and includes a region where titanium is unevenly distributed, a region where nickel is unevenly distributed, and a region where magnesium is unevenly distributed in a projection on its surface. Aluminum is preferably unevenly distributed in a surface portion, not in the projection, of the positive electrode active material.

Abstract: Disclosed are a separator for fuel cells capable of minimizing the volume of a system and the use of sealants, and a stack for fuel cells, more particularly, a stack for solid oxide fuel cells, including the same. Specifically, by adding a metal sheet having a specific shape, position and size to the separator, the stress applied to the sealant can be uniformized, and thus the oxidizing agent and fuel can be separated and electrically isolated using only a piece of sealant. Therefore, the stack for fuel cells is characterized in that there is no variation in temperature, reactant concentration, power, or the like between respective unit cells, so delamination and microcracks do not occur, the volume is minimized, and the power density per unit volume is very high.

Abstract: The present invention relates to a battery cell for evaluating an internal short circuit, and a method for evaluating using the battery cell, wherein an internal short circuit state of a battery cell can be easily induced and, at the same time, an effective internal short circuit evaluation is possible, and the battery cell comprising: first and second electrodes which comprise a coated region on which an electrode mixture layer is coated on a metal current collector and a non-coated region on which an electrode mixture layer is not coated, and which comprise first and second electrode tabs which protrude in one direction from the coated region and do not have an electrode mixture layer coated thereon.

Abstract: A separator for a rechargeable lithium battery and a rechargeable lithium battery, the separator including a porous substrate; and a coating layer on at least one surface of the porous substrate, wherein the coating layer includes a binder and inorganic particles, the binder including a polyurethane and a polyvinyl alcohol, and the polyurethane and the polyvinyl alcohol are included in a weight ratio of about 5:5 to about 9:1.

Abstract: A fuel cell system conduit assembly includes a dielectric tube having a first end and a second end, a metallic first flange press-fit to the first end of the dielectric tube, a metallic second flange press-fit to the second end of the dielectric tube, a first snap ring disposed between the first flange and the dielectric tube, and a second snap ring disposed between the second flange and the dielectric tube.

Abstract: A polycrystalline fused product based on brownmillerite, includes, for more than 95% of its weight, of the elements Ca, Sr, Fe, O, M and M?, the contents of the elements being defined by the formula XyMzFetM?uO2.5, wherein the atomic indices are such that 0.76?y?1.10, z?0.21, 0.48?t?1.15 and u?0.52, 0.95?y+z?1.10, and 0.95?t+u?1.10, X being Ca or Sr or a mixture of Ca and Sr, M being an element chosen from the group formed by La, Ba and mixtures thereof, M? being an element chosen from the group formed by Ti, Cu, Gd, Mn, Al, Sc, Ga, Mg, Ni, Zn, Pr, In, Co, and mixtures thereof, the sum of the atomic indices of Ti and Cu being less than or equal to 0.1.

Abstract: One embodiment of the present invention provides a non-aqueous electrolyte solution for a lithium secondary battery, including a lithium salt, an organic solvent and a compound represented by Formula 1 as a first additive, wherein, R1 and R2 are described herein.

Abstract: A fuel cell includes a cell structure, an oxidizing agent flow path, a fuel flow path, and an anode-side current collector. The cell structure includes a cathode, an anode, and a solid electrolyte layer disposed between the cathode and the anode. The oxidizing agent flow path is formed adjacent to the cathode and away from the solid electrolyte layer. The oxidizing agent flow path is a flow path for supplying a gas that contains an oxidizing agent to the cathode. The fuel flow path is formed adjacent to the anode and away from the solid electrolyte layer. The fuel flow path is a flow path for supplying a fuel gas that contains water vapor and a hydrocarbon to the anode. The anode-side current collector is disposed adjacent to the anode and away from the solid electrolyte layer. The anode-side current collector is in contact with the anode.

Abstract: A polymer electrolyte is provided, which includes a polymer including an ethylene oxide unit; and a lithium salt, wherein the terminal of the polymer is substituted with one to four functional groups selected from the group consisting of a nitrogen compound functional group and phosphorus compound functional group, and the terminal of the polymer and the one to four functional groups are linked by one selected from the group consisting of a C2 to C20 alkylene linker, a C2 to C20 ether linker, and a C2 to C20 amine linker. A method for preparing the same is also provided.

Abstract: A solid polymer electrolyte and a method of manufacturing the same are provided. More particularly, a solid polymer electrolyte having a high content of solids and exhibiting a flame retardant property and a method of manufacturing the same, wherein the solid polymer electrolyte includes a multifunctional acrylate-based polymer, a C2 to C10 polyalkylene oxide, a lithium salt and a non-aqueous solvent and wherein the multifunctional acrylate-based polymer is cross-linked with the polyalkylene oxide to form a semi-interpenetrating polymer network (semi-IPN).

Abstract: A multilayer electrode includes a current collector, a first electrode mixture layer disposed on at least one surface of the current collector, and a second electrode mixture layer disposed on the first electrode mixture layer. The first and second electrode mixture layers include one or more types of conductive materials. A porosity of the conductive material contained in the second electrode mixture layer is greater than that of the conductive material contained in the first electrode mixture layer. Ion mobility to the inside of an electrode may be improved while maintaining electrical conductivity, by including a conductive material having a relatively great average particle diameter and pores in the conductive material itself. Output characteristics of a lithium secondary battery and charging and discharging performance may be improved.

Abstract: A method of producing a positive-electrode active material for a non-aqueous electrolyte secondary battery is provided. The method includes obtaining a precipitate containing nickel and manganese from a solution containing nickel and manganese, heat-treating the resulting precipitate at a temperature of from 850° C. to less than 1100° C. to obtain a first heat-treated product, mixing the first heat-treated product and a lithium compound, and heat-treating the resulting lithium-containing mixture at a temperature of from 550° C. to 1000° C. to obtain a second heat-treated product. The second heat-treated product contains a group of lithium transition metal composite oxide particles having an average particle diameter DSEM of from 0.5 ?m to less than 3 ?m and D50/DSEM of 1 to 2.5. The lithium transition metal composite oxide particles have a spinel structure based on nickel and manganese.

Abstract: A compound according to an embodiment is represented by Formula 1. An electrolyte includes a lithium salt, an organic solvent, and the compound. A lithium secondary battery includes a cathode, an anode disposed to face the cathode, a separation membrane interposed between the cathode and the anode, and the electrolyte. In a method for preparing the compound, a compound represented by Formula 2 and a compound represented by Formula 3 are reacted.

Abstract: Oxygen electrodes are provided, comprising a perovskite compound having Formula (I), Sr(Ti1-xFex-yCoy)O3-?wherein 0.90?x?0.40 and 0.02?y?0.30. Electrochemical devices comprising such oxygen electrodes are also provided, comprising a counter electrode in electrical communication with the oxygen electrode, and a solid oxide electrolyte between the oxygen electrode and the counter electrode. Methods of using such electrochemical devices are also provided, comprising exposing the oxygen electrode to a fluid comprising O2 under conditions to induce the reaction O2+4e??2O2?, or to a fluid comprising O2? under conditions to induce the reaction 2O2??O2+4e?.

Abstract: A rechargeable metal halide battery shows increased metal halide utilization with the introduction of electronegative heteroatom-enriched conductive additives into a metal halide cathode incorporated into an electrically conductive material. The electronegative heteroatom-enriched conductive additives include nitrogen-doped carbon, such as nitrogen-doped single layer graphene, and oxygen-enriched carbon, such as acid-treated carbon black. The modified batteries utilize 20-30% more metal halide than unmodified batteries resulting in enhanced specific capacity and energy density.

Abstract: The present disclosure relates to a composition for a polymer electrolyte, a polymer electrolyte comprising the same, and a method for producing the polymer electrolyte, and specifically, to a composition for a polymer electrolyte comprising an ion conductive monomer and a polymerizable comonomer, and a polymer electrolyte comprising the same.

Abstract: A separator that includes a porous polymer substrate, a first porous coating layer and a second porous coating layer. First inorganic particles contained in the first porous coating layer have a lower hardness as compared to the second inorganic particles contained in the second porous coating layer. Since the separator is provided with at least two porous coating layers including inorganic particles having a different hardnesses, it is possible to increase the dielectric breakdown voltage, and thus to provide a battery with improved safety. It is also possible to reduce deformation of the separator caused by heat or pressure.