| abstract |
An active material for a lithium secondary battery, comprising a material capable of electrochemically desorbing and inserting Li, wherein the quality of metallic iron in the material is less than 5 ppm, and a lithium secondary battery having the active material . When the iron grade in the material is less than 5 ppm, the capacity retention after a predetermined cycle is maintained in a high value range, and the performance of the lithium secondary battery is improved. |