Abstract: Disclosed are a secondary battery, an active material, a method for preparing the same, and a lithium secondary battery including the same. In an embodiment, provided is a secondary battery including a positive electrode, a negative electrode and an electrolyte, wherein the secondary battery further includes a reaction-inducing substance located in any one of the positive electrode, the negative electrode and the electrolyte, wherein the reaction-inducing substance forms a reaction product by consuming thermal energy when exposed to a predetermined temperature or higher in a use environment of the secondary battery, thereby improving thermal safety of the secondary battery.

Abstract: The present invention relates to a cathode active material, and a lithium secondary battery comprising the same, the present invention provides a cathode active material, represented by the following Chemical Formula 1, wherein I003/I104 ratio is 1.6 or more, and R-factor value represented by the following Formula 1 is 0.40 to 0.44, and c-axis lattice constant (c) and a-axis lattice constant (a) satisfy 3(a)+5.555?(c)?3(a)+5.580: R-factor=(I102+I006)/(I101)??Formula 1 wherein I003, I006, I101, I102, and I104 are the intensity of diffraction peaks on the (003), (006), (101), (102), and (104) planes by X-ray diffraction analysis using CuK?-rays, Li?[(NixCoy)1-?A?]Oz??Chemical Formula 1 in the Chemical Formula 1, 0.95???1.1, 0.75?x?0.95, 0.03?y?0.25, 0<??0.2, and 1.9?z?2.1, and A is a dopant metal element, and the average oxidation number N of A is 3.05?N?3.35.

Abstract: Disclosed is a secondary battery including a positive electrode, a negative electrode and an electrolyte, wherein the secondary battery further includes a reaction-inducing substance located in any one of the positive electrode, the negative electrode and the electrolyte, wherein the reaction-inducing substance forms a reaction product when exposed to a predetermined temperature or higher in a use environment of the secondary battery, wherein the reaction product is a non-conductor.

Abstract: The present invention relates to a metal oxide powder, a method of preparing the same, and a lithium secondary battery using the same, which comprises: a metal oxide powder is represented by Formula (1), Lix(M1-m-zAmDz)Ot??Formula (1) in the above Formula (1), 0.85?x?1.2, 0?m?0.01, 0<z?0.04, 1.85?t?2.2, M is selected from the group consisting of Ni, Co, Mn and combinations thereof, A is selected from the group consisting of Mg, Ca, Sr, Ba and combinations thereof, D is selected from the group consisting of Ti, Zr, Ce, Ge, Sn and combinations thereof, and E is an average oxidation number of A and D, and E>3.5.

Abstract: A positive active material for a rechargeable lithium battery, a method for manufacturing the same, and a rechargeable lithium battery including the same are provided. A positive active material for a rechargeable lithium battery includes a compound that is capable of reversibly intercalating or deintercalating lithium, wherein the compound is formed of a core portion and a coating layer, the core portion is doped with M, and the coating layer includes Al and B, wherein M is Zr, Ti, Mg, Ca, Al, B, V, Zn, Mo, Ni, Co, Mn, or a combination thereof.

Abstract: In an embodiment of the present invention, a positive active material for a lithium secondary battery is represented by Formula 1, and includes a core including a compound having a core portion and a surface portion, and the compound has a lower L3/L2 intensity ratio of Ni in the surface portion than an L3/L2 intensity ratio of Ni in the core portion. Li[LizA(1-z-a)Da]EbO2-b??[Formula 1] (In the above formula (1), A is Ni?Co?Mn?, D is at least one element selected from the group consisting of Na, K, Mg, Ca, Sr, Ni, Co, Ti, Al, B, Si, Sn, Mn, Cr, Fe, V, Zr, Nb, and Mo, E is at least one element selected from the group consisting of P, F, and S, ?0.05?z?0.1, 0?a?0.05, 0?b?0.05, 0.3???0.9, 0.05???0.4, and 0.05???0.4.) (The L3/L2 intensity ratio of Ni is the oxidation number of Ni measured by electronic energy loss spectroscopy (EELS).).

Abstract: Disclosed are a secondary battery, an active material, a method for preparing the same, and a lithium secondary battery including the same. In an embodiment, provided is a secondary battery including a positive electrode, a negative electrode and an electrolyte, wherein the secondary battery further includes a reaction-inducing substance located in any one of the positive electrode, the negative electrode and the electrolyte, wherein the reaction-inducing substance forms a reaction product by consuming thermal energy when exposed to a predetermined temperature or higher in a use environment of the secondary battery, thereby improving thermal safety of the secondary battery.

Abstract: Disclosed is a secondary battery including a positive electrode, a negative electrode and an electrolyte, wherein the secondary battery further includes a reaction-inducing substance located in any one of the positive electrode, the negative electrode and the electrolyte, wherein the reaction-inducing substance forms a reaction product when exposed to a predetermined temperature or higher in a use environment of the secondary battery, wherein the reaction product is a non-conductor.

Abstract: The present invention relates to a nickel-based composite oxide for a lithium secondary battery, and a lithium secondary battery including the same, and provides a nickel-based composite oxide for a lithium secondary battery, which comprises: a core part; and at least one tunnel connected from the inside of the core part to the outside thereof, wherein the tunnel has a diameter of 100 nm or larger, and the composite oxide further comprises coating layers located inside the tunnel and outside the core part.

Abstract: There are provided a cathode active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery containing the same. The cathode active material for a lithium secondary battery includes: a compound reversibly intercalating and deintercalating lithium; and a coating layer positioned on at least a portion of a surface of the compound, wherein the coating layer is a composite coating layer containing Li3PO4 and further containing a lithium metal oxide, a metal oxide, and/or a combination thereof, the lithium metal oxide or the metal oxide containing Zr.

Abstract: There are provided a cathode active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery containing the same. The cathode active material for a lithium secondary battery includes: a core made of a compound reversibly intercalating and deintercalating lithium; and a coating layer positioned on at least a portion of a surface of the compound, wherein the coating layer is a composite coating layer containing Li3PO4 and LiF, and further containing a lithium metal compound, a metal oxide, a metal fluoride compound, and/or a combination thereof, and the core is doped with fluorine.

Abstract: A method for preparing a cathode active material for a lithium secondary battery is provided. The preparing method includes: adding a phosphorus compound to a transition metal oxide dispersion liquid to prepare a coating liquid; drying the coating liquid to prepare a powder including phosphorus oxide coated on the surface of the transition metal oxide; and dry-mixing the powder coated with the phosphorus oxide with a lithium intercalation compound, and then firing the mixture to form a solid solution compound of L1-M1-M2-P—O (where M1 is a transition metal derived from transition metal oxide, and M2 is a metal derived from lithium intercalation compound) on the surface of the lithium intercalation compound. The method for preparing a cathode active material for a lithium secondary battery simplifies the conventional preparing process to save process cost, and it provides comparable electrochemical characteristics to a cathode active material obtained from a wet process.

Abstract: The present invention relates to a positive active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same. More particularly, the present invention relates to a positive active material for a rechargeable lithium battery including a compound that can reversibly intercalate/deintercalate lithium and a lithium metal phosphate produced through binding with lithium of the compoound, the lithium metal phosphate existing from the surface of the compound to a predetermined depth, a method of preparing the positive active material, and a rechargeable lithium battery having the positive active material. The positive active material can accomplish excellent cycle-life characteristic and also, suppress battery swelling at a high temperature.

Abstract: Disclosed is a method for preparing a cathode active material for a lithium secondary battery, and the preparing method includes: adding a phosphorus compound to a transition metal oxide dispersion liquid to prepare a coating liquid; drying the coating liquid to prepare a powder including phosphorus oxide coated on the surface of the transition metal oxide; and dry-mixing the powder coated with the phosphorus oxide with a lithium intercalation compound, and then firing the mixture to form a solid solution compound of Li-M1-M2-P—O (where M1 is a transition metal derived from transition metal oxide, and M2 is a metal derived from lithium intercalation compound) on the surface of the lithium intercalation compound. The method for preparing a cathode active material for a lithium secondary battery simplifies the conventional preparing process to save process cost, and it provides comparable electrochemical characteristics to a cathode active material obtained from a wet process.

Abstract: The positive active material according to one embodiment of the present invention includes a composite metal oxide of the following Formula 1, and a compound being capable of intercalating and deintercalating lithium having the composite metal oxide coated on the surface thereof. M1-xAlO2 ??[Chemical Formula 1] Wherein, in the above Formula 1, M is selected from the group consisting of an alkali metal, an alkaline-earth metal, and combinations thereof, and 0.03?x?0.95. The composite metal oxide increases impregnation of an electrolyte, improves lithium mobility, and decreases internal resistance of a rechargeable lithium battery, and thereby improves discharge capacity and cycle-life characteristics.

Abstract: A negative active material for a lithium secondary battery according to an embodiment of the present invention includes a core material including an inorganic particulate that is capable of forming a compound by a reversible reaction with lithium, and a surface-treatment layer disposed on the surface of the core material. The surface-treatment layer includes a metal having electronic conductivity of 103 S/cm or more. The negative active material can improve high-rate performance of a lithium secondary battery.

Abstract: The positive active material according to one embodiment of the present invention includes a composite metal oxide of the following Formula 1, and a compound being capable of intercalating and deintercalating lithium having the composite metal oxide coated on the surface thereof. M1-xAlO2 [Chemical Formula 1] Wherein, in the above Formula 1, M is selected from the group consisting of an alkali metal, an alkaline-earth metal, and combinations thereof, and 0.03?x?0.95. The composite metal oxide increases impregnation of an electrolyte, improves lithium mobility, and decreases internal resistance of a rechargeable lithium battery, and thereby improves discharge capacity and cycle-life characteristics.

Abstract: The present invention relates to a positive active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same. More particularly, the present invention relates to a positive active material for a rechargeable lithium battery including a compound that can reversibly intercalate/deintercalate lithium and a lithium metal phosphate produced through binding with lithium of the compound, the lithium metal phosphate existing from the surface of the compound to a predetermined depth, a method of preparing the positive active material, and a rechargeable lithium battery having the positive active material. The positive active material can accomplish excellent cycle-life characteristic and also, suppress battery swelling at a high temperature.