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A High-Energy NASICON-Type Na3.2MnTi0.8V0.2(PO4)3 Cathode Material with Reversible 3.2-Electron Redox Reaction for Sodium-Ion Batteries |
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| Authors: | Dr. Ping Hu Dr. Ting Zhu Congcong Cai Dr. Xuanpeng Wang Dr. Lei Zhang Prof. Liqiang Mai Prof. Liang Zhou |
| Affiliation: | 1. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan, 528200 P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 P. R. China These authors contributed equally to this work.;2. Key Laboratory of Textile Fiber and Products, Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan, 430200 China These authors contributed equally to this work.;3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 P. R. China;4. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan, 528200 P. R. China Department of Physical Science & Technology, School of Science, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070 P. R. China Hubei Longzhong Laboratory, Wuhan University of Technology (Xiangyang Demonstration Zone), Xiangyang, 441000 Hubei, China;5. Department of Physical Science & Technology, School of Science, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070 P. R. China;6. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan, 528200 P. R. China |
| Abstract: | Na superionic conductor (NASICON) structured cathode materials with robust structural stability and large Na+ diffusion channels have aroused great interest in sodium-ion batteries (SIBs). However, most of NASICON-type cathode materials exhibit redox reaction of no more than three electrons per formula, which strictly limits capacity and energy density. Herein, a series of NASICON-type Na3+xMnTi1−xVx(PO4)3 cathode materials are designed, which demonstrate not only a multi-electron reaction but also high voltage platform. With five redox couples from V5+/4+ (≈4.1 V), Mn4+/3+ (≈4.0 V), Mn3+/2+ (≈3.6 V), V4+/3+ (≈3.4 V), and Ti4+/3+ (≈2.1 V), the optimized material, Na3.2MnTi0.8V0.2(PO4)3, realizes a reversible 3.2-electron redox reaction, enabling a high discharge capacity (172.5 mAh g−1) and an ultrahigh energy density (527.2 Wh kg−1). This work sheds light on the rational construction of NASICON-type cathode materials with multi-electron redox reaction for high-energy SIBs. |
| Keywords: | Cathode Material Multi-Electron Redox Reaction NASICON Structure Na3+xMnTi1−xVx(PO4)3 Sodium-Ion Batteries |