Details

Autor(en) / Beteiligte

• Zhu, Yuan-En
• Qi, Xingguo
• Chen, Xiaoqing
• Zhou, Xianlong
• Zhang, Xu
• Wei, Jinping
• Hu, Yongsheng
• Zhou, Zhen

Titel

A P2-Na0.67Co0.5Mn0.5O2 cathode material with excellent rate capability and cycling stability for sodium ion batteriesElectronic supplementary information (ESI) available: More structural characterizations and electrochemical tests. See DOI: 10.1039/c6ta02845d

Erscheinungsjahr

2016-07

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Sodium ion batteries are considered as next-generation energy storage devices; however, stable cathode materials are highly desirable and challenging for sodium ion batteries. Herein, we report the preparation of a layered cathode material, P2-Na 0.67 Co 0.5 Mn 0.5 O 2 , with a hierarchical architecture, through a facile and simple sol-gel route. X-ray diffraction (XRD) and high resolution transmission electron microscopy elucidated a well-defined P2-type phase structure, and in situ XRD measurements provided further evidence about the structural stability during desodiation/sodiation. Benefiting from the structural stability, the cathode material delivered a high discharge capacity of 147 mA h g −1 at 0.1C rate, and excellent cyclic stability with nearly 100% capacity retention over at least 100 cycles at 1C. More importantly, 88 mA h g −1 was maintained when the electrode was cycled at a very high rate of 30C, and almost half of its capacity was retained over 2000 cycles, which outperforms all the reported P2-type cathode materials. With outstanding electrochemical performance and structural flexibility, the P2-Na 0.67 Co 0.5 Mn 0.5 O 2 cathode material will promote the practical applications of sodium ion batteries. This work presents P2-type layered Na 0.67 Co 0.5 Mn 0.5 O 2 with a hierarchical architecture as a cathode material for sodium ion batteries. Owing to its superior structural flexibility, it delivered outstanding rate capability and long cyclic stability.