Positive electrode material, electrochemical device, and electrical device

Abstract

A positive electrode material includes a first powder. The first powder includes first secondary particles. The first secondary particles includes at least two first primary particles. An average particle diameter D1 of the first primary particles is 500 nm to 3 μm. An average particle diameter D2 of the first secondary particles is 2 μm to 8 μm. A ratio K1 of D2 to D1 satisfies: 2≤K1≤10. The first powder includes an element Co and optionally further includes a metal element M. The metal element M includes at least one of Mn, Al, W, Ti, Zr, Mg, La, Y, Sr, or Ce. A molar ratio R1 between Co and M is greater than or equal to 5. The positive electrode material achieves relatively high rate performance and safety on the basis of achieving a relatively high energy density.

Dependencies are inferred from the claim text.