POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES AND MANUFACTURING METHOD THEREOF, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

• Main Authors: INOUE KATSUYA, TOYA HIROMASA
• Format: Patent
• Language: English; Japanese
• Published: 10.03.2016
• 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 provide: a positive electrode active material for nonaqueous electrolyte secondary batteries which can achieve superior battery characteristics in a nonaqueous electrolyte secondary battery; a manufacturing method of such a positive electrode active material; and a nonaqueous electrolyte secondary battery.SOLUTION: A positive electrode active material for nonaqueous electrolyte secondary batteries comprises lithium nickel cobalt manganese complex oxide particles of secondary particles, each including an outer shell part of a high manganese concentration, and a center part of a low manganese concentration lower than the outer shell part in manganese concentration. The high-manganese concentration outer shell part of each secondary particle includes primary particles each having an outer peripheral part of a low manganese concentration and an inside part of a high manganese concentration. The ratio of the inside manganese concentration to the manganese concentration of the primary particle outer peripheral part is 1.5-2.5.SELECTED DRAWING: None 【課題】非水系電解質二次電池の電池特性を優れたものとすることができる非水系電解質二次電池用の正極活物質及びその製造方法、並びに非水系電解質二次電池を提供する。【解決手段】リチウムニッケルコバルトマンガン複合酸化物粒子の二次粒子が高マンガン濃度の外殻部と外殻部よりマンガン濃度が低い低マンガン濃度の中心部からなり、二次粒子の高マンガン濃度の外殻部を構成する一次粒子は、低マンガン濃度の外周部と高マンガン濃度の内部からなり、一次粒子の外周部のマンガン濃度に対する内部のマンガン濃度の比が１．５〜２．５である非水系電解質二次電池用の正極活物質を得る。【選択図】なし