899results about How to "Improve life characteristics" patented technology

A nitride semiconductor laser device has a group III nitride semiconductor multilayer structure. The group III nitride semiconductor multilayer structure includes an n-type semiconductor layer, a p-type semiconductor layer and a light emitting layer held between the n-type semiconductor layer and the p-type semiconductor layer, and the p-type semiconductor layer is formed by successively stacking a p-side guide layer, a p-type electron blocking layer in contact with the p-side guide layer and a p-type cladding layer in contact with the p-type electron blocking layer from the side closer to the light emitting layer. The p-side guide layer is formed by stacking a layer made of a group III nitride semiconductor containing Al and a layer made of a group III nitride semiconductor containing no Al. The p-type cladding layer is made of a group III nitride semiconductor containing Al, and the p-type electron blocking layer is made of a group III nitride semiconductor having a larger Al composition than the p-type cladding layer.

A vehicle including a fuselage having a longitudinal axis and a transverse axis, two Ducted Fan lift-producing propellers carried by the fuselage on each side of the transverse axis, a pilot's compartment formed in the fuselage between the lift-producing propellers and substantially aligned with one side of the fuselage, a payload bay formed in the fuselage between the lift-producing propellers and opposite the pilot's compartment, and two pusher fans located at the rear of the vehicle. Many variations are described enabling the vehicle to be used not only as a VTOL vehicle, but also as a multi-function utility vehicle for performing many diverse functions including hovercraft and ATV functions. Also described is an Unmanned version of the vehicle. Also described are unique features applicable in any single or multiple ducted fans and VTOL vehicles.

An electrolyte for a lithium secondary battery, the electrolyte including: a lithium salt; a non-aqueous organic solvent; and a piperazine derivative represented by Formula 1 having an oxidation potential lower than an oxidation potential of the non-aqueous organic solvent by about 2 V to about 4 V:wherein, in Formula 1, X, Y, and R1 to R4 are defined in the specification.

In a stacked display device with light-emitting units composed of organic layers and stacked together, the use of a stable material in at least a portion of a charge generation layer makes it possible to achieve improvements in environmental stability and also to attain an improvement in the efficiency of injection of charges from the charge generation layer into the light-emitting units. The display device can be readily fabricated. In a display device (11) provided with a plurality of light-emitting units (14-1)(14-2), each of which includes at least an organic light-emitting layer (14c), stacked together between a cathode (16) and an anode (13), and also with a charge generation layer (15) held between the respective light-emitting units (14-1)(14-2), at least a portion of the charge generation layer (15) is composed of an oxide or fluoride which contains at least one of alkali metals and alkaline earth metals.

The invention relates to an electroluminescent compound and an electroluminescent device comprising the same. The electroluminescent compound is characterized in that the electroluminescent compound is indicated by the following chemical formula (1) and has a non-symmetric structure with L---L' as a benchmark. According to the electroluminescent compound, substituent groups having high efficiency or long service life are respectively combined with pryene compound in a non-symmetric way, so illuminating efficiency and service life are improved and excitation purity and thermal stability are enhanced; the electroluminescent device comprising the same also has excellent excitation purity, illuminating efficiency and long service life; and the electroluminescent compound can be applied to various displaying elements.

Provided is a reliable secondary battery with improved life characteristics. The lithium-ion secondary battery (secondary battery) has: a positive electrode which includes a positive electrode active material layer; a negative electrode which includes a negative electrode active material layer and which is arranged to face the positive electrode; a housing container in which the positive and negative electrodes are housed; and a lid member which seals the opening of the housing container. The positive and negative electrodes have edge portions respectively, and are housed in the housing container with a pressing force applied to a region of the positive and negative electrode active material layers excluding at least part of the edge portions.

Disclosed is a multilayer body comprising an active material layer and a solid electrolyte layer which is bonded to the active material layer by sintering. The active material layer contains a crystalline first substance capable of discharging and adsorbing lithium ions, and the solid electrolyte layer contains a crystalline second substance having lithium ion conductivity. Incidentally, when this multilayer body is analyzed by an X-ray diffraction method, there is detected no component other than the constituents of the active material layer and the constituents of the solid electrolyte layer. Also disclosed is an all-solid lithium secondary battery comprising such a multilayer body and a negative electrode active material layer.

Provided are a positive active material that has a decreased amount of Li-containing impurities that remain on a lithium transition metal composite oxide surface to decrease an amount of gas generation and has improved lifespan properties, a method of preparing the same, a positive electrode for a lithium secondary battery including the positive active material, and a lithium secondary battery including the same.

Provided are a nickel-based active material, a method of preparing the same, and a lithium secondary battery including a positive electrode including the nickel-based active material. The nickel-based active material includes at least one secondary particle including an aggregate of two or more primary particles, wherein at least a portion of the secondary particle has a radial array structure, and a hetero-element compound is positioned between the primary particles.

A multilayer ceramic capacitor has a laminate comprising dielectric layers stacked alternately with internal electrode layers of different polarities, wherein: the dielectric layers contain ceramic grains whose primary component is BaTiO3; the ceramic grains contain at least one type of donor element (D) selected from the group that includes Nb, Mo, Ta, and W, and at least one type of acceptor element (A) selected from the group that includes Mg and Mn; and the ratio of the concentration of the donor element (D) and that of the acceptor element (A) (D / A) is greater than 1 at the center parts of the ceramic grains, while the D / A ratio is less than 1 at the outer edge parts of the ceramic grains (if A=0, then D / A=∞ and D=A=0 never occurs).

The present invention relates to a gel polymer electrolyte and a lithium secondary battery comprising same, the gel polymer electrolyte comprising a polymer network and an electrolyte solution impregnated on the polymer network, wherein the polymer network is formed having an oligomer bound in a three-dimensional structure, the oligomer comprising: a unit A which is derived from a monomer comprising at least one or more of a copolymerizable acrylate or acrylic acid; a unit C which comprises urethane; and a unit E which comprises siloxane.

A negative active material including: a porous silicon-carbon secondary particle including: a plurality of silicon-carbon primary particles including a plurality of silicon-carbon primary particles including a silicon material, and a first carbonaceous material, wherein an apparent density of a silicon-carbon primary particle of the plurality of silicon-carbon primary particles is about 2 grams per cubic centimeter or greater; and a second carbonaceous material, wherein the second carbonaceous material is disposed on the plurality of silicon-carbon primary particles.

The present invention relates to an anode for a lithium secondary battery, comprising: an electrode collector; and a multilayer structure including a primary anode active material layer including a first anode active material formed on the electrode collector, and a secondary anode active material layer including a second anode active material formed on the first anode active material layer and having a relatively low density and a relatively large average particle size. The anode according to one embodiment of the present invention can improve a charging characteristic and a lifespan characteristic of the lithium secondary battery by improving the porosity of the surface of an electrode after a rolling process by including a multilayer active material layer including two kinds of anode active materials having different rolling densities and average particle sizes on the electrode collector, so as to improve mobility of ions into the inside of the electrode.

Disclosed is a light-emitting diode drive device that improves the utilization efficiency and power factor of LEDs while maintaining power supply efficiency. Said light-emitting diode drive device is provided with: a rectification circuit (2) that can be connected to an AC power supply and rectifies the AC voltage from said AC power supply into a pulsed voltage; a first LED block (11) comprising a plurality of light-emitting diodes, a second LED block (12) comprising a plurality of light-emitting diodes, and a third LED block (13) comprising a plurality of light-emitting diodes, connected sequentially in series to the output side of the rectification circuit (2); a first switching means that turns a first bypass path (BP1), which bypasses the second LED block (12), on or off on the basis of the amount of power supplied to the first LED block (11); and a second switching means that turns a second bypass path (BP2), which bypasses the third LED block (13), on or off on the basis of the amount of power supplied to the first LED block (11) and the second LED block (12).

The invention relates to a lithium-transition metal compound powder for a positive-electrode material for lithium secondary battery which comprises secondary particles configured of primary particles having two or more compositions and a lithium-transition metal compound having a function of being capable of insertion and release of lithium ions, wherein the powder gives a pore distribution curve having a peak at a pore radium 80 nm or greater but less than 800 nm, and the secondary particles include primary particles of a compound represented by a structural formula including at least one element selected from As, Ge, P, Pb, Sb, Si and Sn, wherein the primary particles of the compound are present at least in an inner part of the secondary particles.

Disclosed is an electrolyte comprising a compound having both a sulfonate group and a cyclic carbonate group. The electrolyte forms a more stable and dense SEI layer on the surface of an anode, and thus improves the capacity maintenance characteristics and lifespan characteristics of a battery. Also, disclosed is a compound represented by the following Formula 1, and a method for preparing the same by reacting 4-(hydroxyalkyl)-1,3-dioxolan-2-one with a sulfonyl halide compound:wherein each of R1 and R2 independently represents a C1˜C6 alkylene group optionally containing a C1˜C6 alkyl group or C2˜C6 alkenyl group introduced thereto; R3 is selected from the group consisting of a hydrogen atom, C1˜C20 alkyl group, C3˜C8 cyclic alkyl group, C2˜C6 alkenyl group, halo-substituted alkyl group, phenyl group and benzyl group.

Disclosed is a cathode comprising a complex formed between the surface of a cathode active material and an aliphatic mono-nitrile compound, and an electrochemical device comprising the cathode. A non-aqueous electrolyte containing a lithium salt, a solvent and an aliphatic mono-nitrile compound, and an electrochemical device comprising the electrolyte are also disclosed. The electrochemical device shows excellent low-temperature characteristics, high-temperature life characteristics and safety.

The present disclosure relates to a multilayer negative electrode comprising a negative electrode current collector configured to transfer electrons between an outer lead and a negative electrode active material, a first negative electrode mixture layer formed on one surface or both surfaces of the current collector and containing natural graphite as a negative electrode active material and a second negative electrode mixture layer formed on the first negative electrode mixture layer and containing artificial graphite as a negative electrode active material, and a lithium secondary battery including the same.

Provided are a phosphor which is capable of emitting green light of high luminance and in which unfavorable effects on other members has been reduced so as to be applicable to white light having excellent light emitting characteristics, a light emitting device using the phosphor, and a method for manufacturing the phosphor. The phosphor containing silicon, magnesium, and chlorine, and activated with europium and capable of emitting green light, in which the molar ratio of chlorine to magnesium is in a range of 1.0≦Cl / Mg≦1.9. Introduction of chlorine at such a composition ratio improves the light emitting characteristics and the amount of chlorine dissolved.

A nitride semiconductor laser device comprises a nitride semiconductor substrate (101); a nitride semiconductor lamination structure that has an n-type semiconductor layer (102), an active layer (104) and a p-type semiconductor layer (103) laminated on or above the nitride semiconductor substrate (101), and has a stripe-shaped waveguide region for laser light; and end surface protective films (110) on the both end surfaces substantially perpendicular to the waveguide region. In the nitride semiconductor laser device, the nitride semiconductor substrate (101) has a luminescent radiation region (112) that absorbs light emitted from the active layer (104) and emits luminescent radiation with a wavelength longer than the wavelength of the emitted light, and the end surface protective films (110) have a high reflectivity for the wavelength of the luminescent radiation from the luminescent radiation region (112). Accordingly, a nitride semiconductor laser device that does not improperly operate and has excellent FFP is provided.

An additive for an electrolyte solution includes a lithium salt having an oxalato complex as an anion and a compound represented by following Chemical Formula 1.Wherein, a represents C or Si, b represents H or F, and n represents an integer of 1 to 5. A non-aqueous electrolyte solution including the additive and a lithium secondary battery including the electrolyte solution also are provided.

The present invention provides a positive electrode active material for a secondary battery and a secondary battery including the same, which includes a core; a shell located to surround the core; and a buffer layer located between the core and the shell, and including a three-dimensional network structure connecting the core and the shell and a pore, in which the core, the shell, and the three-dimensional network structure in the buffer layer each independently include a lithium nickel-manganese-cobalt-based composite metal oxide, and the positive electrode active material has a BET specific surface area of 0.2 m2 / g to 0.5 m2 / g, a porosity of 30 vol % or less, and an average particle size (D50) of 8 μm to 15 μm. The decomposition of the active material may be minimized by a rolling process in the manufacture of an electrode by controlling the specific surface area, average particle diameter and porosity of the active material particles as well as the specific structure, the reactivity with an electrolyte solution may be maximized, and the output and lifespan characteristics of the secondary battery may be improved since the particles forming the shell have crystal structure with orientation which facilitates intercalation and deintercalation of lithium ions.

A method for producing a lithium ion secondary battery includes the steps of: forming a positive electrode mixture layer on a positive electrode substrate to obtain a positive electrode; forming a negative electrode mixture layer on a negative electrode substrate to obtain a negative electrode; forming an electronically insulating porous film that is bonded to a surface of at least one of the positive electrode and the negative electrode; interposing a separator between the positive electrode and the negative electrode to form an electrode plate assembly; and impregnating the electrode plate assembly with a non-aqueous electrolyte. The step of forming a porous film includes the steps of: preparing a porous film paste that contains a film binder comprising a thermo-cross-linkable resin and a particulate filler; and applying the porous film paste onto a surface of at least one of the positive electrode and the negative electrode and heating the resultant applied film.

The present invention provides a lithium secondary battery manufacturing method comprising: a pretreatment step of forming a solid electrolyte interphase (SEI) membrane on an electrode by immersing the electrode in an SEI membrane formation composition containing a lithium salt, a non-aqueous organic solvent, and an SEI membrane formation agent capable of forming the SEI membrane by means of an electrochemical oxidation reaction or an electrochemical reduction reaction, and then applying voltage to the composition; and a step of using the electrode, having the SEI membrane formed thereon, so as to manufacture a battery assembly, putting the battery assembly into a battery case, and performing, at least once, a combined step of electrolyte injection and charging. According to the manufacturing method, the SEI membrane is formed on the electrode in advance by the electrode pretreatment, the electrode having the SEI membrane formed thereon is put into the battery case, and the electrolyte is injected, at least once, into the case in steps, and thus the output characteristics and lifetime characteristics of a lithium secondary battery can be further improved.

An anode, a lithium battery including the anode, and a method of preparing the anode. The anode includes a current collector; a first anode layer disposed on the current collector; a second anode layer disposed on the first anode layer; and an inorganic protection layer disposed on the second anode layer, wherein an oxidation / reduction potential of the first anode layer and an oxidation / reduction potential of the second anode layer are different from each other.

A nitride semiconductor laser diode includes a substrate, an n-side nitride semiconductor layer formed on the substrate, an active layer formed on the n-side nitride semiconductor layer and having a light emitting layer including InxAlyGa1−x−yN (0<x<1, 0 y<1, 0<x+y<1), and a p-side nitride semiconductor layer formed on the active layer. In the nitride semiconductor laser diode, the lasing wavelength of the nitride semiconductor laser diode is 500 nm or greater, dislocations originated in the active layer penetrate through the p-side nitride semiconductor layer, with the dislocation density in the p-side nitride semiconductor layer being 1×106 cm−2 or greater, and the concentration distribution of p-type impuritys in the depth direction is such that, from the light emitting layer toward the surface of the p-side nitride semiconductor layer, the concentration of the p-type impurity reaches a maximum value of 5×1018 cm−3 or greater within a range of 300 nm from the top portion of the light emitting layer which is closest to the p-side nitride semiconductor layer, and after reaching the maximum value, the concentration remains at 6×1017 cm−3 or greater in the above-described range of 300 nm.

Provided are a compound for an organic optoelectronic device represented by Chemical Formula 1, an organic light emitting diode including the same, and a display device including the organic light emitting diode. The structure of Chemical Formula 1 is shown in the specification.The compound for an organic optoelectronic device provides an organic light emitting diode having life-span characteristics due to excellent electrochemical and thermal stability, and having high luminous efficiency at a low driving voltage.

The present specification provides an organic electroluminescent element comprising a capping layer on one surface of an electrode.