METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL

• Main Authors: AIDA TAIRA, KATO TOSHIHIRO, SUGANUMA SHINSUKE
• Format: Patent
• Language: English; Japanese
• Published: 01.03.2021
• 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

To provide a method for stably manufacturing a positive electrode active material capable of showing superior battery characteristics without causing a handling problem.SOLUTION: A method is arranged for manufacturing a positive electrode active material consisting of a lithium transition metal composite oxide manufactured by performing a thermal treatment on a mixture of a transition metal composite hydroxide of which the compositional formula is represented by e.g. NixMnyCozMt(OH)2+α (M is one or more additive elements selected from a group consisting of Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W), and a lithium compound. In the method, the thermal treatment is performed preferably in a low-oxidization gas atmosphere of 20-30 vol.% in oxygen density in a low-temperature region of a threshold temperature or below within a range of 700°C up to 900°C, and it is performed in a high-oxidization gas atmosphere of 40 vol.% or higher in oxygen density in a high-temperature region above the predetermined threshold temperature.SELECTED DRAWING: Figure 1 【課題】 優れた電池特性を示すことが可能な正極活物質を安定的に且つ取り扱い上の問題を生ずることなく製造する方法を提供する。【解決手段】 組成式が例えばＮｉｘＭｎｙＣｏｚＭｔ(ＯＨ)２＋α（Ｍは、Ｍｇ、Ｃａ、Ａｌ、Ｔｉ、Ｖ、Ｃｒ、Ｚｒ、Ｎｂ、Ｍｏ、Ｈｆ、Ｔａ、及びＷからなる群から選択される１種以上の添加元素）で示される遷移金属複合水酸化物とリチウム化合物との混合物を熱処理することで製造するリチウム遷移金属複合酸化物からなる正極活物質の製造方法であって、該熱処理は、好適には７００℃以上９００℃以下の範囲内にある閾値温度以下の低温域では酸素濃度２０容量％以上３０容量％以下の低酸化性ガス雰囲気で行い、該所定の閾値温度を超えた高温域では酸素濃度４０容量％以上の高酸化性ガス雰囲気で行う。【選択図】図１