Electrode material and method for forming electrode material

A method for forming an electrode material comprising:

• forming a first mixture material by adding a solution to a compound serving as a supply source of Li, a compound serving as a supply source of A, and a compound serving as a supply source of Si and by mixing the solution and the compounds for the first mixture material;
• subjecting the first mixture material to first heat treatment to form a first material from the first mixture material;
• forming a second mixture material by adding a compound serving as a supply source of Li, a compound serving as a supply source of E, and a compound serving as a supply source of PO4 to the first material and by mixing the first mixture material and the compounds for the second mixture material;
• and
• subjecting the second mixture material to second heat treatment to form a second material from the second mixture material,
• wherein A represents at least one kind of an element selected from Fe, Co, Mn and Ni, and
• wherein E represents at least one kind of an element selector from Fe, Co, Mn and Ni.