Positive electrode active material, electrode, and battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsDaiki MAEDA, Yuki Ishigaki
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Abstract
The positive electrode active material includes a plurality of secondary particles. A cross-section of the secondary particles includes a central portion and a peripheral portion. The central portion includes a plurality of first primary particles having a first average particle diameter. The peripheral portion includes a plurality of second primary particles having a second average particle diameter. The first primary particles and the second primary particles include an olivine phosphate compound. A relationship of d2<d1 is satisfied, where d1 indicates the first average particle diameter, and d2 indicates the second average particle diameter.
Claims5
A positive electrode active material comprising a plurality of secondary particles, wherein:
- a cross-section of each of the secondary particles includes a central portion and a peripheral portion;
- the central portion includes a plurality of first primary particles having a first average particle diameter;
- the peripheral portion includes a plurality of second primary particles having a second average particle diameter;
- the first primary particles and the second primary particles contain an olivine phosphate compound;
- a relationship of d2<d1 is satisfied;
- d1 indicates the first average particle diameter;
- and
- d2 indicates the second average particle diameter.
Dependencies are inferred from the claim text.