| abstract |
The invention discloses a composite positive electrode material, comprising: a first composite oxide, a second composite and an organic polymer, the first composite oxide and the second composite both include primary particles and/or secondary particles, the first composite oxide and the second composite The particle diameter of the primary particles of the composite oxide is 150-600 nm, the average particle diameter of the first composite oxide is 3-5 μm; the particle diameter of the primary particles of the second composite is 50-300 nm, and the average particle diameter of the second composite The diameter is 0.5-10 μm; the second compound is filled in the voids of the first compound oxide, and the organic polymer coats the first compound oxide or/and the second compound; the first compound oxide is a transition metal element-containing Oxide material, the second composite is Prussian blue system and/or polyanionic compound nanoparticles. The invention also discloses a positive electrode sheet of the sodium ion battery and the sodium ion battery. The composite positive electrode material of the present invention has the advantages of high compaction density and high gram capacity, the structure will not be damaged in the cycle process. |