POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, MANUFACTURING METHOD THEREOF, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY ARRANGED BY USE THEREOF

• Main Authors: TOYA HIROMASA, FUKUI ATSUSHI, KUZUO RYUICHI
• Format: Patent
• Language: English; Japanese
• Published: 06.10.2016
• 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 which has good thermal stability and a high charge/discharge capacity when used as a positive electrode material of a nonaqueous electrolyte secondary battery.SOLUTION: A lithium nickel composite oxide is expressed by the following general formula: LiNiMO(x satisfies (4-Z)x≥0.75, where Z is an average valence of Ni, and M represents at least one additive element which is 3.375 or larger in average valence of the whole M). The lithium nickel composite oxide is obtained by a manufacturing method which comprises: (1) a crystallization step for obtaining the complex hydroxide, NiM(OH)by adding an alkali liquid solution to a mixed aqueous solution of a salt of Ni and a salt of M; (2) a sintering step for mixing the complex hydroxide with a lithium compound so that the mole ratio given by Li/(Ni+M) becomes 1.00-1.15 and then, sintering the resultant mixture at a temperature of 700-1000°C; and (3) a water-rinse step for rinsing the resultant lithium nickel composite oxide with water.SELECTED DRAWING: Figure 1 【課題】非水系電解質二次電池の正極材料として用いた場合に、熱安定性が良好で、かつ高い充放電容量を有する正極活物質を提供する。【解決手段】一般式：ＬｉＮｉxＭ1-xＯ2（式中のｘは、Ｎｉの平均価数をＺとしたときに（４−Ｚ）ｘ≧０．７５を満たし、式中のＭは、Ｍ全体としての平均価数が３．３７５価以上となる少なくとも１種の添加元素を表す）で表されるリチウムニッケル複合酸化物を、(1)Ｎｉ塩とＭ塩の混合水溶液にアルカリ溶液を加えて、複合水酸化物：ＮｉxＭ1-x（ＯＨ）2を得る晶析工程と、(2)該複合水酸化物とリチウム化合物とを、モル比：Ｌｉ／（Ｎｉ＋Ｍ）が１．００〜１．１５となるように混合し、７００℃以上１０００℃以下の温度で焼成する焼成工程と、(3)得られたリチウムニッケル複合酸化物を水洗処理する水洗工程を備える製造方法により得る。【選択図】図１