METHOD OF PREPARATION OF ELECTRODE ACTIVE MATERIALS FOR ENHANCING PERFORMANCE OF LITHIUM SECONDARY BATTERIES AND LITHIUM SECONDARY BATTERIES CONTAINING ELECTRODE ACTIVE MATERIALS PREPARED BY THE SAME

• Main Authors: KIM, SOO CHAN, CHOI, SEON JU, YANG, WOO YOUNG, KIM, KEON IL, KIM, CHUN JOONG, CHANG, DONG GYU
• Format: Patent
• Language: English; Korean
• Published: 31.12.2012
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; 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 manufacturing method of electrode active material is provided not to form precipitate on the electrode surface after high speed charging and discharging reaction for long time. CONSTITUTION: A manufacturing method of electrode active material comprises the following steps: mixing lithium compound with titanic compound; and heat-treating the reactive mixture at 700-900 deg. Celsius for 4-8 hours. The composition ratio of Ti / Li on the surface is controlled to higher than 0.8. The lithium titanium oxide controls the lithium element constitution on the surface as less than 20%. The mixing reaction of the lithium compound with titanic compound is completed by injecting the lithium compound and titanium compound into the solvent and agitates on the slurry. [Reference numerals] (AA) Atom; (BB) Fraction rate; (CC) Total sum