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Nano Research

Article Title

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

Authors

Xuemei Ma, School of Material Science and Engineering, Central South University, Changsha 410083, China
Xinxin Cao, School of Material Science and Engineering, Central South University, Changsha 410083, China;Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China
Yifan Zhou, School of Material Science and Engineering, Central South University, Changsha 410083, China
Shan Guo, School of Material Science and Engineering, Central South University, Changsha 410083, China
Xiaodong Shi, School of Material Science and Engineering, Central South University, Changsha 410083, China
Guozhao Fang, School of Material Science and Engineering, Central South University, Changsha 410083, China;Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China
Anqiang Pan, School of Material Science and Engineering, Central South University, Changsha 410083, China;Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China
Bingan Lu, School of Physics and Electronics, Hunan University, Changsha 410082, China
Jiang Zhou, School of Material Science and Engineering, Central South University, Changsha 410083, China;Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China
Shuquan Liang, School of Material Science and Engineering, Central South University, Changsha 410083, China;Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China

Keywords

sodium superionic conductor (NASICON)-type, crystal structure, cathode material, full cell, sodium ion battery

Abstract

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.

Publisher

Tsinghua University Press

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