Abstract
Mixing P2 and O3 phases in a single material is expected to take advantage of both phases. This work reports the successful synthesis of a Li-free P2/O3 biphasic cathode Na0.73Ni0.4Mn0.4Ti0.2O2 containing 33% of P2 phase by a solid-state method. According to XRD refinement, the interplanar distance along the c-axis decreases from 5.6055 A in the pure P2 material to 5.5710 A in the P2 phase of the biphasic material, while increases from 5.4502 A in the pure O3 material to 5.4855 A in the O3 phase of the biphasic material, indicating different electrostatic repulsions between transitional metal oxide layers. Compared to pure P2 or O3 phase, the biphasic cathode exhibits an initial Coulombic efficiency close to 100%, increased reversible capacity and average voltage, improved cycling stability, and rate performance in the voltage range of 1.5–4.3 V. The biphasic cathode is a promising candidate for full cell application of sodium-ion batteries.
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