Obtaining P2-Na-0.56[Ni0.1Co0.1Mn0.8]O-2 Cathode Materials for Sodium-Ion Batteries by using a Co-precipitation Method

For the sake of achieving the practical application of sodium-ion batteries, extensive efforts have been made to improve the electrochemical performance of cathode materials. A simple co-precipitation route is successfully developed to synthesize nanowires of transition metal hydroxides through a sodium peroxide pouring process instead of the traditional sodium hydroxide dropping approach. After a subsequent annealing process, a well-crystallized P2-Na-0.56[Ni0.1Co0.1Mn0.8]O-2 layered cathode material is obtained. Owing to such an exquisite architecture, this material possesses an excellent electrochemical performance, exhibits a reversible capacity of 188 mAh g(-1) at 48 mA g(-1) in the voltage range of 1.5-4.1 V with nearly 99.7 % coulombic efficiency and retains approximately 80.2 % of the initial capacity after 50 cycles. Moreover, even at an extremely high current density of 2400 mA g(-1), it delivers a capacity of 134 mAh g(-1) and remains at 76 mAh g(-1) after 1500 cycles, which surpasses most reported layered transition metal oxide cathode materials. This strategy of providing a strong oxidizing environment during the co-precipitation process is especially crucial for obtaining materials with excellent electrochemical performances for future energy storage application.