LITHIUM ION BATTERY AND MANUFACTURING METHOD THEREFOR

摘要

In a lithium ion battery of the present invention, a positive electrode mixture includes a first active substance made of olivine type lithium iron phosphate and having a first particle size as an average particle size, and a second active substance made of olivine type lithium iron phosphate and having as an average particle size a second particle size larger than the first particle size. The weight ratio of the first active substance to the second active substance is between 20:80 and 90:10.