Research Article


2020, 13(12): 3330–3337


Tuning crystal structure and redox potential of NASICON-type cathodes for sodium-ion batteries

Xuemei Ma1, Xinxin Cao1,2 (✉), Yifan Zhou1, Shan Guo1, Xiaodong Shi1, Guozhao Fang1,2, Anqiang Pan1,2, Bingan Lu3, Jiang Zhou1,2 (✉), and Shuquan Liang1,2 (✉)

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1 School of Material Science and Engineering, Central South University, Changsha 410083, China
2 Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China
3 School of Physics and Electronics, Hunan University, Changsha 410082, China

Keywords: sodium superionic conductor (NASICON)-type, crystal structure, cathode material, full cell, sodium ion battery
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Sodium superionic conductor (NASICON)-type compounds have been regarded as promising cathodes for sodium-ion batteries (SIBs) due to their favorable ionic conductivity and robust structural stability. However, their high cost and relatively low energy density restrict their further practical application, which can be tailored by widening the operating voltages with earth-abundant elements such as Mn. Here, we propose a rational strategy of infusing Mn element in NASICON frameworks with sufficiently mobile sodium ions that enhances the redox voltage and ionic migration activity. The optimized structure of Na3.5Mn0.5V1.5(PO4)3/C is achieved and investigated systematically to be a durable cathode (76.6% capacity retention over 5,000 cycles at 20 C) for SIBs, which exhibits high reversible capacity (113.1 mAh·g−1 at 0.5 C) with relatively low volume change (7.6%). Importantly, its high-areal-loading and temperature-resistant sodium ion storage properties are evaluated, and the full-cell configuration is demonstrated. This work indicates that this Na3.5Mn0.5V1.5(PO4)3/C composite could be a promising cathode candidate for SIBs.
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Tuning crystal structure and redox potential of NASICON-type cathodes for sodium-ion batteries. Nano Res. 2020, 13(12): 3330–3337

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