POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR PRODUCING THE SAME, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE POSITIVE ELECTRODE ACTIVE MATERIAL

• Main Authors: YAMAUCHI MITSURU, USHIO RYOZO
• Format: Patent
• Language: English; Japanese
• Published: 08.12.2016
• 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 a nonaqueous electrolyte secondary battery in which cycle characteristics and high-temperature storage characteristics are improved without damaging the advantage of high capacity inherent to a lithium nickel composite oxide.SOLUTION: A positive electrode active material for a nonaqueous electrolyte secondary battery is manufactured with at least an oxidizing roasting step S12, a mixing step S13, and a firing step S14, the positive electrode active material containing a lithium nickel composite oxide represented by general formula (1): LiNiCoMnMgO(where u, x, y, and z in the formula satisfy the conditions 0.015≤u≤0.030, 0.05≤x≤0.20, 0.01≤y≤0.10, 0.01≤z≤0.05 and 0.10≤x+y+z≤0.25.), and having a crystallite diameter of 100-130 nm.SELECTED DRAWING: Figure 1 【課題】リチウムニッケル複合酸化物が本来有する高容量という利点を損なわずに、サイクル特性と高温保存特性とを向上させた非水系電解質二次電池用正極活物質を提供する。【解決手段】一般式（１）：Ｌｉ１＋ｕＮｉ１−ｘ−ｙ−ｚＣｏｘＭｎｙＭｇｚＯ２（ただし、式中のｕ、ｘ、ｙ及びｚは、０.０１５≦ｕ≦０．０３０、０．０５≦ｘ≦０．２０、０．０１≦ｙ≦０．１０、０．０１≦ｚ≦０．０５、０．１０≦ｘ＋ｙ＋ｚ≦０．２５を満たす。）で表されるリチウムニッケル複合酸化物を含み、結晶子径が１００ｎｍ〜１３０ｎｍである非水系電解質二次電池用正極活物質を、少なくとも、酸化焙焼工程Ｓ１２、混合工程Ｓ１３及び焼成工程Ｓ１４を経ることにより作製する。【選択図】図１