M 1491 (OTTO) Manganese phosphate Cas no 51349-94-1 - used as a contributor to the cathode of lithium rechargeable batteries.This is due to the olivine structure created when lithium is combined with manganese, iron, and phosphate (as described above). The olivine structures of lithium rechargeable batteries are significant, for they are affordable, stable, and can be safely stored as energy.