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

• Main Author: OTSUKA YOSHIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 25.01.2018
• 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, which enables the suppression of the worsening of charge and discharge characteristics owing to exposure to a high-temperature and high-humidity environment.SOLUTION: A positive electrode active material for a nonaqueous electrolyte secondary battery is provided, which comprises: particles of a lithium nickel composite oxide represented by the general formula, LiNiCoAlO(where 0.90≤x≤1.20, 0.01≤y≤0.20, and 0.01≤z≤0.10); and a region disposed on at least part of the surface of each particle of the lithium nickel composite oxide and including one or more elements selected from boron (B), phosphorus (P) and silicon (Si), lithium (Li) and oxygen (O). In the positive electrode active material, the content of carbon is 0.06 mass% or less.SELECTED DRAWING: Figure 1 【課題】高温高湿環境下に晒すことによる充放電特性の低下を抑制できる非水系電解質二次電池用正極活物質を提供することを目的とする。【解決手段】一般式：ＬｉｘＮｉ１-ｙ-ｚＣｏｙＡｌｚＯ２（０．９０≦ｘ≦１．２０、０．０１≦ｙ≦０．２０、０．０１≦ｚ≦０．１０）で表されるリチウムニッケル複合酸化物の粒子、及び前記リチウムニッケル複合酸化物の粒子の少なくとも表面の一部に配置され、ホウ素（Ｂ）、リン（Ｐ）、及びケイ素（Ｓｉ）から選択される一種以上の元素と、リチウム（Ｌｉ）と、酸素（Ｏ）とを含有する領域を有し、炭素含有量が０．０６質量％以下である非水系電解質二次電池用正極活物質を提供する。【選択図】図１