Positive electrode active material for nonaqueous electrolyte secondary battery

• Main Authors: ATSUSHI OGAWA, KENICHI KOBAYASHI, SOSHI KAWAMURA, TORU SUKIGARA, HIROTO MAEYAMA
• Format: Patent
• Language: Chinese; English
• Published: 20.10.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a positive electrode active material for a nonaqueous electrolyte secondary battery, the material having the characteristics of both high power and high endurance. The positive electrode active material for a nonaqueous electrolyte secondary battery includes particles of a lithium-transition metal composite oxide that contains nickel in the composition thereof and has a layered structure. The particles have an average particle size DSEM based on electron microscopic observation in a range of 1 [mu]m to 7 [mu]m in which a ratio DSO/DSEM of a 50% particle size D50 in volume-based cumulative particle size distribution to the average particle size based on electron microscopic observation is in a range of 1 to 4, and a ratio D90/D10 of a 90% particle size D 90 to a 10% particle size D10 in volume-based cumulative particle size distribution is 4 or less. 本发明提供种非水电解质二次电池用正极活性物质，其能够兼具高功率特性和高耐久性两者。非水电解质二次电池用正极活性物质含有锂过渡金属复合氧化物粒子组，该锂过渡金属复合氧化物粒子组：基于电子显微镜观察的平均粒径D为1μm以上7μm以下，基于体积基准的累积粒度分布的50％粒径D与基于电