Abstract:
Disclosed is a compound represented by the following formula 1: wherein, each of R1˜R13 independently represents —H, —F, —Cl, —Br, —I, —OH, —SH, —COOH, —PO3H2, —NH2, —NO2, —O(CH2CH2O)nH (wherein, n is an integer of 1˜5), C1˜C12 alkyl group, C1˜C12 aminoalkyl group, C1˜C12 hydroxyalkyl group, C1˜C12 haloalkyl group, C2˜C12 alkenyl group, C1˜C12 alkoxy group, C1˜C12 alkylamino group, C1˜C12 dialkylamino group, C6˜C18 aryl group, C6˜C18 aminoaryl group, C6˜C18 hydroxyaryl group, C6˜C18 haloaryl group, C7˜C18 benzyl group, C7˜C18 aminobenzyl group, C7˜C18 hydroxybenzyl group, C7˜C18 halobenzyl group, or nitrile group (—CN); and at least one of R4˜R13 is nitrile group (—CN). A non-aqueous electrolyte comprising: (i) a lithium salt, (ii) a solvent, and (iii) a compound represented by formula 1; and a secondary battery comprising the non-aqueous electrolyte are also disclosed. When the compound represented by formula 1 is added to a non-aqueous electrolyte, it is possible to improve the safety of a secondary battery in an overcharged state.
Abstract:
The present invention relates to a non-aqueous electrolyte additive for improving safety and a lithium secondary battery comprising the same, and more particularly to a non-aqueous electrolyte additive that can improve cycle life and safety properties of a lithium ion secondary battery. According to the present invention, an organometallic compound represented by the Chemical Formula 1 is added to a non-aqueous electrolyte of a battery as an additive, and thus if a battery voltage is out of normal operation voltage range due to a short circuit and overcharge of a battery, etc., the non-aqueous electrolyte additive decomposes and a part of the decomposed additive polymerizes to form an insulating film on a cathode surface, and a part of the metal reacts with an insulating film formed on a cathode surface to improve thermal stability of the battery, thereby improving safety of the battery.
Abstract:
Disclosed is a lithium secondary battery, which is low in capacity loss after overdischarge, having excellent capacity restorability after overdischarge and shows an effect of preventing a battery from swelling at a high temperature.
Abstract:
Disclosed is an electrolyte comprising: (a) an electrolyte salt; (b) a non-aqueous electrolyte solvent; and (c) a binary or multinary metal oxide salt. An electrochemical device comprising the same electrolyte is also disclosed. The metal oxide salt used in the electrolyte is dissolved in a non-aqueous solvent and generates oxyanions capable of improving corrosion resistance of metals. Therefore, the electrolyte prevents corrosion of metallic materials present in an electrochemical device, caused by extreme conditions, such as overcharge, overdischarge and high-temperature storage conditions, to which the device is exposed. Further, the electrolyte prevents degradation in the quality of an electrochemical device, caused by corrosion of metallic materials.
Abstract:
Disclosed are a cathode for a battery and a lithium ion battery. The cathode for a battery comprises a metal hydroxide having a large specific surface area as a cathode additive. The lithium ion battery comprises a cathode, an anode and a non-aqueous electrolyte, wherein the cathode comprises a metal hydroxide having a large specific surface area as a cathode additive. When a metal hydroxide having a large specific surface area is used as a cathode additive, excellent storage properties of a battery at a high temperature can be obtained, even if the metal hydroxide is used in a small amount.
Abstract:
Disclosed is an anode active material, comprising: (a) a carbonaceous material; and (b) a carbide coating layer partially or totally formed on a surface of the carbonaceous material, the carbide coating layer comprising at least one element selected from the group consisting of metals and metalloids. An anode obtained by using the anode active material and an electrochemical device comprising the anode are also disclosed. The carbonaceous material comprises a coating layer of metal-/metalloid-carbide obtained by treating it at high temperature under inert atmosphere, wherein the coating layer has increased interfacial boding force to the carbonaceous material and thus shows minimized reactivity to lithium. The carbonaceous material as anode active material can minimize the irreversible anode capacity needed for the formation of an SEI film during the first charge/discharge cycle, thereby providing high capacity, high efficiency and significantly improved anode qualities.
Abstract:
A superconducting magnesium diboride (MgB2) thin film having c-axial orientation and a method and apparatus for fabricating the same are provided. The fabrication method includes forming a boron thin film on a substrate and thermally processing the substrate on which the boron thin film is formed along with a magnesium source and cooling the resulting structure. The superconducting magnesium diboride thin film can be used in a variety of electronic devices employing superconducting thin films, such as precision medical diagnosis equipment using superconducting quantum interface devices (SQUIDs) capable of sensing weak magnetic fields, microwave communications equipment used for satellite communications, and Josephson devices. Computer systems with 100 times greater computing speed can be implemented with the superconducting magnesium diboride thin film.
Abstract translation:提供了具有c轴取向的超导二硼化镁(MgB 2 N 2)薄膜及其制造方法和装置。 制造方法包括在基板上形成硼薄膜,并与镁源一起热处理形成有硼薄膜的基板,并冷却所得到的结构。 超导二硼化镁薄膜可用于使用超导薄膜的各种电子装置,例如使用能够感测弱磁场的超导量子接口装置(SQUID)的精密医疗诊断装置,用于卫星通信的微波通信设备和 约瑟夫森设备。 使用超导二硼化镁薄膜可以实现计算速度提高100倍的计算机系统。
Abstract:
The present invention relates to a poly(2-vinylpyridine)-b-poly(n-hexylisocyanate) amphiphilic coil-rod block copolymer and a polymerization method thereof, more particularly to a poly(2-vinylpyridine)-b-poly(n-hexylisocyanate) amphiphilic coil-rod block copolymer polymerized by a process comprising synthesizing poly(2-vinylpyridine) having a narrow molecular weight distribution by living polymerization using potassium diphenylmethane (K-DPM) as initiator, adding sodium tetraphenylborate (NaBPh4) to replace the counter cation with a sodium ion (Na+) and adding n-hexylisocyanate and performing polymerization and a polymerization method thereof. According to the present invention, it is possible to control the molecular weight and the structure of each block of the copolymer. Therefore, coil-rod type amphiphilic block copolymers having a variety of structures can be obtained. The resultant block copolymer is a useful optical polymer material.
Abstract:
Disclosed is a lithium secondary battery, which is low in capacity loss after overdischarge, having excellent capacity restorability after overdischarge and shows an effect of preventing a battery from swelling at a high temperature.
Abstract:
The present invention relates to a non-aqueous electrolyte additive for improving safety and a lithium secondary battery comprising the same, and more particularly to a non-aqueous electrolyte additive that can improve cycle life and safety properties of a lithium ion secondary battery. According to the present invention, an organometallic compound represented by the Chemical Formula 1 is added to a non-aqueous electrolyte of a battery as an additive, and thus if a battery voltage is out of normal operation voltage range due to a short circuit and overcharge of a battery, etc., the non-aqueous electrolyte additive decomposes and a part of the decomposed additive polymerizes to form an insulating film on a cathode surface, and a part of the metal reacts with an insulating film formed on a cathode surface to improve thermal stability of the battery, thereby improving safety of the battery.