Lithium manganese oxide particles and methods of making the same

Lithium manganese oxide particles comprising:

• a lithium manganese core particle comprising LixMn2O4, where 0.75≤x≤1.25;
• and
• a catalyst particle comprising:
• one or more transition metal selected from group consisting of a period 5 transition metal, a period 6 transition metal, a period 7 transition metal, and a combination thereof;
• an oxide of the one or more transition metal;
• a salt of the one or more transition metal;
• or a combination thereof;
• wherein the lithium manganese oxide particles have a substantially round shape.

An electrochemical cell comprising:

• a positive electrode comprising a first electroactive material comprising:
• lithium manganese oxide particles comprising:
• a lithium manganese core particle comprising LixMn2O4, where 0.75≤x≤1.25;
• and
• a catalyst particle comprising:
• one or more transition metal selected from group consisting of a period 5 transition metal, a period 6 transition metal, a period 7 transition metal, and a combination thereof an oxide of the one or more transition metal;
• an oxide of the one or more transition metal;
• a salt of the one or more transition metal;
• or a combination thereof;
• wherein the lithium manganese oxide particles have a substantially round shape;
• a negative electrode comprising a second electroactive material, wherein the positive electrode is spaced apart from the negative electrode;
• a porous separator disposed between confronting surfaces of the positive electrode and the negative electrode;
• and
• a liquid electrolyte infiltrating one or more of:
• the positive electrode, the negative electrode, and the porous separator.