LITHIUM TITANIUM OXIDE FOR PROVIDING LITHIUM SECONDARY BATTERIES WITH ENHANCED PROPERTIES AND METHODS OF PREPARING THE SAME

• Main Authors: KIM, SOO CHAN, CHOI, SEON JU, YANG, WOO YOUNG, KIM, KEON IL, CHANG, DONG GYU
• Format: Patent
• Language: English; Korean
• Published: 04.10.2012
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PURPOSE: A lithium titanium oxide and a manufacturing method thereof are provided to control particle size distribution of lithium titanium oxide powder. CONSTITUTION: A lithium titanium oxide has a particle size distribution R expressed in the following equation: R>1.40 (R=A/B, A=D50/D10, B=D90/D50). D10, D50 and D90 in the particle size distribution curve of LTO power are particle diameters when distribution rate is 10%, 50% and 90%. In the particle size distribution curve of the lithium titanium oxide, more than two particle diameters which accomplish a peak of particle distribution exist. A manufacturing method of the lithium titanium oxide comprises the following steps: mixing two or more lithium titanium oxide particles having different average particle diameters, or pulverizing the lithium titanium oxide particle, or manufacturing primary lithium titanium oxide particle having particle diameter of less than 300 nanometers; and manufacturing secondary particle having particle diameter of 10-100 um from the same. [Reference numerals] (AA) Comparative example 1; (BB) Comparative example 2; (CC) Comparative example 3; (DD) Comparative example 4; (EE) Comparative example 5; (FF) Practical example 1; (GG) Practical example 2; (HH) Practical example 3; (II) Practical example 4