Hollow K0.27MnO2 Nanospheres as Cathode for High-Performance Aqueous Sodium Ion Batteries

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• 作者：Yang Liu ; Yun Qiao ; Xiangdong Lou ; Xinhe Zhang ; Wuxing Zhang ; Yunhui Huang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 15, 2016
• 年：2016
• 卷：8
• 期：23
• 页码：14564-14571
• 全文大小：620K
• 年卷期：0
• ISSN：1944-8252

文摘

Hollow K_0.27MnO₂ nanospheres as cathode material were designed for aqueous sodium ion batteries (SIBs) using polystyrene (PS) as a template. The samples were systematically studied by X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. As cathode materials for aqueous SIBs, the hollow structure can effectively improve the sodium storage property. A coin cell with hollow K_0.27MnO₂ as cathode and NaTi₂(PO₄)₃ as anode exhibits a specific capacity of 84.9 mA h g^–1 at 150 mA g^–1, and the capacity of 56.6 mA h g^–1 is still maintained at an extremely high current density of 600 mA g^–1. For full cell measurement at the current density of 200 mA g^–1, 83% capacity retention also can be attained after 100 cycles. The as-designed hollow K_0.27MnO₂ nanospheres demonstrate long cyclability and high rate capability, which grant the potential for application in advanced aqueous SIBs.