Positive electrode sheet and lithium-ion battery

A positive electrode sheet, comprising:

• a positive electrode current collector;
• and
• a positive electrode active material layer arranged on at least a side surface of the positive electrode current collector, the positive electrode active material layer comprising a positive electrode active material, and the positive electrode active material comprising:
• a first lithium iron phosphate material;
• and
• a second lithium iron phosphate material,
• wherein when the cumulative volume distribution percentage of the first lithium iron phosphate material is 50%, the corresponding particle size is D1v50 μm, when the cumulative volume distribution percentage of the second lithium iron phosphate material is 50%, the corresponding particle size is D2v50 μm, D1v50 is in the range of 0.3-0.95, and D2v50 is in the range of 1.0-3.5;
• when the volume density of the positive electrode active material reaches a maximum value, the corresponding particle size is Dmo μm;
• and the compaction density of the positive electrode sheet is PD g/cm3 under a pressure of 1.5 Mpa, and PD meets:
• 0.45≤PD×Dmo≤12.38.