Positive electrode active material and preparation method thereof, pole piece, energy storage device and power utilization device

The invention discloses a positive active material and a preparation method thereof, a pole piece, an energy storage device and an electric device. The positive electrode active material comprises LiMnaFe < 1-a-b-c > M < 1 b > M < 2 c > PO < 4 >, a is less than or equal to 0....

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1. Verfasser: XIE YANCHONG
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention discloses a positive active material and a preparation method thereof, a pole piece, an energy storage device and an electric device. The positive electrode active material comprises LiMnaFe < 1-a-b-c > M < 1 b > M < 2 c > PO < 4 >, a is less than or equal to 0.8, 0lt; b is less than or equal to 0.1, 0lt; c is less than or equal to 0.1, M1 comprises a titanium element, M2 comprises an aluminum element, the positive electrode active material is granular, the doping amount of the titanium element in the central region of the positive electrode active material particle is greater than that in the surface layer of the positive electrode active material particle, and the doping amount of the aluminum element in the central region of the positive electrode active material particle is less than that in the surface layer of the positive electrode active material particle. The positive electrode active material has relatively high structural thermal stability and relatively low impedance, and is benefici