Prussian blue-like transition metal cyanide, preparation method therefor, and related positive electrode plate, secondary battery, battery module, battery pack and device
Embodiments of the present application provide a Prussian blue-like transition metal cyanide, a preparation method therefor, and related positive electrode plate, secondary battery, battery pack and device. The Prussian blue-like transition metal cyanide may comprise secondary particles which comprise a plurality of primary particles, wherein the primary particles may have a spherical or spherical-like morphology.
1 . A Prussian blue-like transition metal cyanide, comprising secondary particles which comprise a plurality of primary particles, wherein the primary particles have a spherical or spherical-like morphology,
wherein the primary particles have a radius of curvature equal to or larger than 0.8 μm.
2 . The Prussian blue-like transition metal cyanide according to claim 1 , wherein the secondary particles have an interior angle of 150° to 300°.
3 . The Prussian blue-like transition metal cyanide according to claim 1 , wherein the Prussian blue-like transition metal cyanide has a volume-average particle size D v 50 equal to or larger than 1 μm.
4 . The Prussian blue-like transition metal cyanide according to claim 1 , wherein the Prussian blue-like transition metal cyanide has a powder compacted density of 1.7 g/cm 3 to 2.1 g/cm 3 under a pressure of 600 MPa.
5 . The Prussian blue-like transition metal cyanide according to claim 1 , wherein the Prussian blue-like transition metal cyanide includes AxM 1 [M 2 (CN) 6 ] y , in which
A is selected from one or more of alkali metal ions and alkaline earth metal ions;
M 1 is selected from one or more of Mn, Ni, Cu, Co, Fe, Zn, and Cr;
M 2 is selected from one or more of Mn, Ni, Cu, Co, Fe, Zn, and Cr;
1.5≤x≤2; and
0.6≤y≤1.
6 . The Prussian blue-like transition metal cyanide according to claim 1 , wherein the Prussian blue-like transition metal cyanide has a powder resistivity of 10 kΩ·cm to 100 kΩ·cm under a pressure of 12 MPa.
7 . The Prussian blue-like transition metal cyanide according to claim 1 , wherein the Prussian blue-like transition metal cyanide has a capacity per gram of 140 mAh/g to 170 mAh/g.
8 . A secondary battery, comprising a positive electrode plate, the positive electrode plate comprising a positive electrode material, wherein the positive electrode material includes a Prussian blue-like transition metal cyanide according to claim 1 .
9 . The Prussian blue-like transition metal cyanide according to claim 1 , wherein the Prussian blue-like transition metal cyanide has a volume-average particle size D v 50 equal to or larger than 15 μm.