PRECURSOR FOR POSITIVE ELECTRODE MATERIAL OF LITHIUM ION SECONDARY BATTERY

• Main Authors: TAZAKI HIROSHI, KAJITANI YOSHIO
• Format: Patent
• Language: English
• Published: 06.10.2011
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To establish a simple means of providing a positive electrode material of a lithium ion secondary battery with minimal impurities affecting battery characteristics, excellent composition stability and favorable battery characteristics.SOLUTION: When charging an aqueous chloride solution of Ni, Mn or Co or a mixture of the solution and an aqueous chloride solution of Mg, Al, Ti, Cr, Fe, Cu or Zr in lithium carbonate suspension, the carbonate containing Li is precipitated by determining the amount of the suspension of a lithium carbonate (w) in accordance with a formula of "w (mol)=amount of total metal component other than Li (mol)×(1+0.5x)" (where, x=amount of Li necessary for battery positive-electrode material/amount of total metal component other than Li), and the obtained carbonate is cleaned by a saturated lithium carbonate or ethanol. The precursor for positive-electrode material which is thus obtained with a molar ratio of the amount of Li to the total metal other than Li being 0.5 to 1.3 is used as the positive-electrode material (active material) in a simple method for performing high-temperature oxidation treatment as it is.