3 years ago

A Practical High-Energy Cathode for Sodium-Ion Batteries Based on Uniform P2-Na0.7CoO2 Microspheres

A Practical High-Energy Cathode for Sodium-Ion Batteries Based on Uniform P2-Na0.7CoO2 Microspheres
Yongjin Fang, Xiong Wen (David) Lou, Xin-Yao Yu
Layered metal oxides have attracted increasing attention as cathode materials for sodium-ion batteries (SIBs). However, the application of such cathode materials is still hindered by their poor rate capability and cycling stability. Here, a facile self-templated strategy is developed to synthesize uniform P2-Na0.7CoO2 microspheres. Due to the unique microsphere structure, the contact area of the active material with electrolyte is minimized. As expected, the P2-Na0.7CoO2 microspheres exhibit enhanced electrochemical performance for sodium storage in terms of high reversible capacity (125 mAh g−1 at 5 mA g−1), superior rate capability and long cycle life (86 % capacity retention over 300 cycles). Importantly, the synthesis method can be easily extended to synthesize other layered metal oxide (P2-Na0.7MnO2 and O3-NaFeO2) microspheres. Layered metal oxide NaxMO2 (M=Co, Mn, Fe) microspheres have been synthesized via a facile self-templated method as advanced cathode materials for sodium-ion batteries. As an example, the P2-Na0.7CoO2 microspheres exhibit greatly enhanced electrochemical sodium storage properties with high reversible capacity (125 mAh g−1 at 5 mA g−1), superior rate capability and long-term cycle life (86 % capacity retention over 300 cycles).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201702024

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