Patent application number | Description | Published |
20100203388 | CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES WITH HIGH SAFETY, METHOD OF PREPARING THE SAME, AND LITHIUM SECONDARY BATTERIES COMPRISING THE SAME - The present invention relates to a cathode active material for lithium secondary batteries with high safety, a method of preparing the same and lithium secondary batteries comprising the same. The cathode active material of the present invention comprises a lithium metal oxide secondary particle core portion formed by aggregation of lithium metal oxide primary particles; and a shell portion formed by coating the secondary particle core portion with an olivine-structured lithium iron phosphate oxide. The cathode active material of the present invention allows to manufacture lithium secondary batteries with improved safety, especially overcharge characteristics. | 08-12-2010 |
20100310940 | CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES WITH HIGH SAFETY, METHOD OF PREPARING THE SAME AND LITHIUM SECONDARY BATTERIES COMPRISING THE SAME - A cathode active material for a lithium secondary battery includes a lithium metal oxide secondary particle core formed by agglomerating lithium metal oxide primary particles; and a shell formed by coating the secondary particle core with barium titanate and metal oxide. This cathode active material allows making a lithium secondary battery having improved safety, particularly in thermal stability and overcharging characteristics. | 12-09-2010 |
20110052991 | CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES, METHOD FOR PREPARING THE SAME, AND LITHIUM SECONDARY BATTERIES COMPRISING THE SAME - Disclosed are a cathode active material for lithium secondary batteries, a method for preparing the same, and lithium secondary batteries comprising the same. The cathode active material for lithium secondary batteries comprises a lithium metal oxide secondary particle core formed by aggregation of a plurality of lithium metal oxide primary particles; a first shell formed by coating the surface of the secondary particle core with a plurality of barium titanate particles and a plurality of metal oxide particles; and a second shell formed by coating the surface of the first shell with a plurality of olivine-type lithium iron phosphate oxide particles and a plurality of conductive material particles. The cathode active material for lithium secondary batteries allows manufacture of lithium secondary batteries having excellent thermal stability, high-temperature durability and overcharge safety. | 03-03-2011 |
20110244322 | CORE-SHELL TYPE ANODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES, METHOD FOR PREPARING THE SAME AND LITHIUM SECONDARY BATTERIES COMPRISING THE SAME - Provided are a core-shell type anode active material for lithium secondary batteries including a carbonaceous material core; and a shell formed outside the carbonaceous material core, the shell including a PTC (Positive Temperature Coefficient) medium. The core-shell type anode active material for lithium secondary batteries has the shell including the PTC medium, and thus has the improved conductivity and high output density, exhibiting excellent electrical characteristics. And, a lithium secondary battery manufactured using the anode active material has excellent safety, in particular safety against overcharge and external short circuit. | 10-06-2011 |
20120135303 | CORE-SHELL TYPE ANODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, METHOD FOR PREPARING THE SAME AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME - The present invention relates to a core-shell type anode active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery comprising the same. The anode active material for a lithium secondary battery according to the present invention comprises a carbon based material core portion; and a shell portion formed outside of the carbon based material core portion by coating the carbon based material core portion with a spinel-type lithium titanium oxide. The anode active material for a lithium secondary battery according to the present invention has the metal oxide shell portion, and thus has the improved conductivity, a high output density, and consequently excellent electrical characteristics. | 05-31-2012 |
20120225344 | SEPARATOR FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME - Disclosed is a separator for a lithium secondary battery and a lithium secondary battery comprising the same. The separator may include a thermoplastic polyolefin-based polymer porous sheet and an aramid-based non-woven fabric sheet stacked on at least one surface of the polyolefin-based polymer porous sheet, wherein the polyolefin-based polymer sheet and the aramid-based non-woven fabric sheet are adhered with an adhesive, and the adhesive loses an adhesive performance at 80° C. or more to separate the two sheets. The separator has a shut-down function and excellent high-temperature shape stability. | 09-06-2012 |
20120241666 | CATHODE ACTIVE MATERIAL PRECURSOR AND ACTIVE MATERIAL FOR A RECHARGEABLE LITHIUM BATTERY COMPRISING HOLLOW NANOFIBROUS CARBON, AND PRODUCTION METHOD THEREOF - A cathode active material precursor for a rechargeable lithium battery including hollow nanofibrous carbon may be a composite cathode active material precursor for a rechargeable lithium battery including hollow nanofibrous carbon; and a cathode active material precursor joined to the skeleton of the hollow nanofibrous carbon, wherein the cathode active material precursor includes a metal composite of Ma(PO | 09-27-2012 |
20130059203 | ANODE ACTIVE MATERIAL FOR A LITHIUM SECONDARY BATTERY, METHOD FOR PREPARING SAME, AND LITHIUM SECONDARY BATTERY INCLUDING SAME - Provided are an anode active material for a lithium secondary battery, a method for preparing same, and a lithium secondary battery including same. An anode active material for a lithium secondary battery according to the present invention includes: active particles by means of which lithium ions may be absorbed/released; and a coating layer coated on the surface of the active particles, wherein the coating layer includes a first material which is a hollow nanofiber and a second material which is a carbon precursor or LTO. | 03-07-2013 |
20140087233 | LITHIUM SECONDARY BATTERY - The present invention relates to a lithium secondary battery. More specifically, according to embodiments of the present invention the lithium battery, which includes a cathode, an anode, and a separate membrane inserted between the cathode and the anode, is characterized in that the separator membrane is a polyolefin porous membrane which has an aramid coating layer; and the cathode includes a lithium metal oxide cathode active material which has an olivine-type iron phosphate lithium coating layer, or the anode includes a carbon anode active material which has a spinel-type lithium titanium oxide coating layer. The lithium secondary battery in accordance with embodiments of the present invention has excellent basic electric performance and improved stability. | 03-27-2014 |
20140370358 | HIGH HEAT RESISTANCE COMPOSITE SEPARATOR FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY INCLUDING SAME - Disclosed is a high heat resistance composite separator including a porous substrate having a plurality of pores, an inorganic coating layer formed on one surface of the porous substrate, the inorganic coating layer including a plurality of inorganic particles and a binder polymer disposed on a portion or all of surfaces of the inorganic particles to connect and bind the inorganic particles, and a high heat resistance polymer coating layer formed on the other surface of the porous substrate, the high heat resistance polymer coating layer including a high heat resistance polymer and inorganic particles dispersed in the high heat resistance polymer. | 12-18-2014 |