LITHIUM IRON PHOSPHATE PARTICLE FOR LITHIUM ION SECONDARY BATTERY POSITIVE ELECTRODE MATERIAL AND ITS MANUFACTURING METHOD, AND LITHIUM ION SECONDARY BATTERY POSITIVE ELECTRODE ARRANGED BY USE THEREOF, AND LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium iron phosphate particle for a lithium ion secondary battery positive electrode material which is arranged to achieve no less than 10 N/m with a 180-degree peel strength defined by JIS K 6854-2 by improvement of a lithium iron phosphate particle used as a material of positive electrode active substance.SOLUTION: A lithium iron phosphate particle exhibits a value of 20.0-40.0 ml/100 g as an amount of absorption of dibutyl phthalate defined by JIS K 6217-4(year of 2008), and shows an average particle diameter (d50 diameter) in a range of 3-50 m in a particle size distribution measurement by laser diffraction.