Positive electrode slurry composition and positive electrode sheet containing the same, secondary battery, battery module, battery pack and electrical device.

Abstract

This application provides a positive electrode slurry composition, comprising a positive electrode sheet, a secondary battery, a battery module, a battery pack, and an electrical device. The positive electrode slurry composition of this application contains a positive electrode active material, a lithium supplement agent, and a binder, wherein the positive electrode active material includes a lithium-containing phosphate as shown in formula (I), LiFe... 1‑b1‑ c1 Mn b1 M 1 c1 Equation PO4(I) where 0 ≤ b1 ≤ 1, 0 ≤ c1 ≤ 0.1, M 1 The lithium supplement is selected from at least one transition metal element other than Fe and Mn, and a non-transition metal element; the lithium supplement is selected from Li. a1 M 2 O 0.5(2+a1) Li2M 3 O3, Li2M 4 O4, Li3M 5 O4, Li5M 6 O4, Li5M 7 One or more of the lithium metal oxides of O6, wherein a1≥1, M 2 Selected from one or more of Ni, Co, Fe, Mn, Zn, Mg, Ca, Cu, and Sn, M 3 Selected from one or more of Ni, Co, Fe, Mn, Sn, and Cr, M 4 Selected from one or more of Ni, Co, Fe, Mn, Sn, Cr, V, and Nb, M 5 Selected from one or more of Ni, Co, Fe, Mn, Sn, Cr, V, Mo, and Nb, M 6 Selected from one or more of Ni, Co, Fe, Mn, Sn, Cr, and Mo, M 7 Selected from one or more of Ni, Co, and Mn, M 2 M 3 M 4 M 5 M 6 M 7 The valence state of each element is lower than its highest oxidation state; and the binder is as shown in formula (II): where R1 and R2 are H or F independently, x, y, and z are all positive integers, and 0.52≤(4x+3y+2z) / (4x+4y+4z)≤0.7.

Images