• The sample of short blade battery was prepared for the first time. • The structure and interfacial reaction of cathode materials were studied. • The preparation and testing system of commercial batteries are reported. The crystal internal structure, surface morphology, element composition and valence state of commercial Na 0.67 Ni 0.30 Mg 0.05 Mn 0.54 Ti 0.11 O 2 (NNMMT) P2-type cathode materials are systematically studied. The cyclic voltammetric test of NNMMT reveals the inhibition of Mg/Ti co-doping on Na + / vacancy ordering and the high reversibility of P2/O2 phase transition at high voltage. On the basis of the NNMMT results, we introduced the preparation process and long-cycle properties of commercial short blade sodium ion battery for the first time. The first discharge capacity of the battery is 95.75 mAh/g, and its first cycle Coulomb efficiency is 99.74%. After 200 cycles, the discharge capacity of the battery is still 94.26 mAh/g and its capacity retention rate is 98.44%. The research results verify the performance of commercial Mg/Ti co-doped P2-type sodium-ion cathode materials and provide a reference for the industrial production of P2-type sodium-ion batteries.
Yang et al. (Sun,) studied this question.