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A Practical High‐Energy Cathode for Sodium‐Ion Batteries Based on Uniform P2‐Na 0.7 CoO 2 Microspheres
Author(s) -
Fang Yongjin,
Yu XinYao,
Lou Xiong Wen David
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201702024
Subject(s) - cathode , electrolyte , electrochemistry , microsphere , materials science , chemical engineering , energy storage , sodium , oxide , metal , ion , nanotechnology , electrode , chemistry , metallurgy , quantum mechanics , power (physics) , physics , organic chemistry , engineering
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‐Na 0.7 CoO 2 microspheres. Due to the unique microsphere structure, the contact area of the active material with electrolyte is minimized. As expected, the P2‐Na 0.7 CoO 2 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‐Na 0.7 MnO 2 and O3‐NaFeO 2 ) microspheres.