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Chen Y, Liao X, Wang P, Chen J, Zhang X, Wu X, Smith SC, Lin D, Tan X, Zheng Q. A high-energy-density NASICON-type Na 3V 1.25Ga 0.75(PO 4) 3 cathode with reversible V 4+/V 5+ redox couple for sodium ion batteries. J Colloid Interface Sci 2024; 653:1-10. [PMID: 37708726 DOI: 10.1016/j.jcis.2023.09.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 09/04/2023] [Accepted: 09/08/2023] [Indexed: 09/16/2023]
Abstract
The stable three-dimensional framework and high operating voltage of sodium superionic conductor (NASICON)-type Na3V2(PO4)3 has the potential to work with long cycle life and high-rate performance; however, it suffers from the poor intrinsic electronic conductivity and low energy density. Herein, Ga3+ is introduced into Na3V2(PO4)3 to activate the V4+/V5+ redox couple at a high potential of 4.0 V for enhancing energy density of the materials (Na3V2-xGax(PO4)3). After the partial substitution of Ga3+ for V3+, three redox couples (V2+/V3+, V3+/V4+ and V4+/V5+) of V are reversibly converted in the voltage range of 1.4-4.2 V, suggesting multi-electrons (>2e-) involved in the reversible reaction, and simultaneously the electronic conductivity of the materials is effectively enhanced. As a result, the cathode with x = 0.75 exhibits excellent electrochemical properties: in the voltage range of 2.2-4.2 V, delivering an initial capacity of 105 mAh/g at 1C with a capacity retention rate of 92.3% after 400 cycles, and providing a stable reversible capacity of 88.3 mAh/g at 40C; and in the voltage range of 1.4-4.2 V, presenting the reversible capacity 152.3 mAh/g at 1C (497.6 Wh kg-1), and cycling stably for 1000 cycles at 20C with a capacity decay of 0.02375% per cycle. It is found that the Na3V2-xGax(PO4)3 cathodes possess the sodium storage mechanism of single-phase and bi-phase reactions. This investigation presents a useful strategy to enhance the energy density and cycling life of NASICON-structured polyanionic phosphates by activating high-potential V4+/V5+ redox couple.
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Affiliation(s)
- Yuxiang Chen
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China
| | - Xiangyue Liao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China
| | - Peng Wang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China
| | - Ji Chen
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China
| | - Xiaoqin Zhang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China
| | - Xingqiao Wu
- Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, PR China
| | - Sean C Smith
- Integrated Materials Design Laboratory, Department of Materials Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
| | - Dunmin Lin
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China.
| | - Xin Tan
- Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, PR China.
| | - Qiaoji Zheng
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China.
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Dai B, Zhou R, Ping J, Ying Y, Xie L. Recent advances in carbon nanotube-based biosensors for biomolecular detection. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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