Positive electrode slurry composition, positive electrode plate comprising same, secondary battery, battery module, battery pack and power consuming device

A positive electrode slurry composition, wherein the composition comprises a positive electrode active material, a lithium-supplementing agent and a binder,

• the positive electrode active material includes a lithium-containing phosphate represented by formula (I),
• LiFe1-b1-c1Mnb1M1c1PO4 formula (I)
• in which 0≤b1≤1, 0≤c1<0.1, and M1 is selected from at least one of a transition metal element other than Fe or Mn and a non-transition metal element;
• the lithium-supplementing agent is selected from one or more of lithium metal oxides of Lia1M2O0.5(2+a1), Li2M3O3, Li2M4O4, Li3M5O4, Li5M6O4, and Li5M7O6,
• in which a1≥1, M2 is selected from one or more of Ni, Co, Fe, Mn, Zn, Mg, Ca, Cu and Sn, M3 is selected from one or more of Ni, Co, Fe, Mn, Sn and Cr, M4 is selected from one or more of Ni, Co, Fe, Mn, Sn, Cr, V and Nb, M5 is selected from one or more of Ni, Co, Fe, Mn, Sn, Cr, V, Mo and Nb, M6 is selected from one or more of Ni, Co, Fe, Mn, Sn, Cr and Mo, M7 is selected from one or more of Ni, Co and Mn, and the valence state of each element of M2, M3, M4, M5, M6 and M7 is lower than its own highest oxidation valence state, respectively;
• and
• the binder is represented by formula (II):
• in which R1 and R2 are independently H or F, x, y, z, and n are all positive integers, and 0.52≤(4x+3y+2z)/(4x+4y+4z)≤0.7, and
• the binder has a weight-average molecular weight of 500,000 to 1,200,000.