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Wang W, Xing Z, Ren H, Wang Q, Gao X, Nie C, Ju Z. MnFe Prussian Blue Analogue Open Cages for Sodium-Ion Batteries: Simultaneous Evolution of Structure, Morphology, and Energy Storage Properties. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2402072. [PMID: 38773874 DOI: 10.1002/smll.202402072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 05/13/2024] [Indexed: 05/24/2024]
Abstract
Prussian blue analogues (PBAs) exhibiting hollow morphologies have garnered considerable attention owing to their remarkable electrochemical properties. In this study, a one-pot strategy is proposed for the synthesis of MnFe PBA open cages. The materials are subsequently employed as cathode electrode in sodium-ion batteries (SIBs). The simultaneous evolution of structure, morphology, and performance during the synthesis process is investigated. The findings reveal substantial structural modifications as the reaction time is prolonged. The manganese content in the samples diminishes considerably, while the potassium content experiences an increase. This compositional variation is accompanied by a significant change in the spin state of the transition metal ions. These structural transformations trigger the occurrence of the Kirkendall effect and Oswald ripening, culminating in a profound alteration of the morphology of MnFe PBA. Moreover, the shifts in spin states give rise to distinct changes in their charge-discharge profiles and redox potentials. Furthermore, an exploration of the formation conditions of the samples and their variations before and after cycling is conducted. This study offers valuable insights into the intricate relationship between the structure, morphology, and electrochemical performance of MnFe PBA, paving the way for further optimizations in this promising class of materials for energy storage applications.
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Affiliation(s)
- Weilu Wang
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China
| | - Zheng Xing
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China
| | - Haipeng Ren
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China
- SVOLT, No. 2199 Chaoyang South Street, Baoding City, Hebei Province, 071000, P. R. China
| | - Qinglin Wang
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China
| | - Xinran Gao
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China
| | - Chuanhao Nie
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China
| | - Zhicheng Ju
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China
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Huang Y, Zhang Q, Sun XG, Liu K, Sun W, Zhi M, Guo Y, Zheng S, Dai S. Multiple Functional Bonds Integrated Interphases for Long Cycle Sodium-Ion Batteries. Angew Chem Int Ed Engl 2024:e202406277. [PMID: 38940896 DOI: 10.1002/anie.202406277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 06/09/2024] [Accepted: 06/27/2024] [Indexed: 06/29/2024]
Abstract
Sodium-ion batteries (SIBs) have garnered significant interest as one of the most promising energy suppliers for power grid energy storage. However, the poor electrode/electrolyte interfacial stability leads to continual electrolyte decomposition and transition metal dissolution, resulting in rapid performance degradation of SIBs. In this work, we propose a strategy integrating multiple functional bonds to regulate electrode/electrolyte interphase by triple-coupling of succinonitrile (SN), sodium hexafluorophosphate (NaPF6) and fluorinated ethylene carbonate (FEC). Theoretical calculation and experiment results show that the solvation structure of Na+ and ClO4 - is effectively reconfigured by the solvated FEC, SN and PF6 - in PC-based carbonate electrolyte. The newly developed electrolyte demonstrates increased Na+-FEC coordination, weakened interaction of Na+-PC and participation of SN and PF6 - anions in solvation, resulting in the formation of a conformal interfacial layer comprising of sodium oxynitrides (NaNxOy), sodium fluoride (NaF) and phosphorus oxide compounds (NaPxOy). Consequently, a 3 Ah pouch full cell of hard carbon//NaNi1/3Fe1/3Mn1/3O2 exhibits an excellent capacity retention of 90.4 % after 1000 cycles. Detailed postmortem analysis of interface chemistry is further illustrated by multiple characterization methods. This study provides a new avenue for developing electrolyte formulations with multiple functional bonds integrated interphases to significantly improve the long-term cycling stability of SIBs.
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Affiliation(s)
- Yongsheng Huang
- Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Qingqing Zhang
- Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Xiao-Guang Sun
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Kai Liu
- School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Weili Sun
- Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Mingyu Zhi
- Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Yayu Guo
- School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Shijian Zheng
- Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Sheng Dai
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Department of Chemistry, University of Tennessee, Knoxville, TN 37996, USA
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Makogon A, Noël JM, Kanoufi F, Shkirskiy V. Deciphering the Interplay between Local and Global Dynamics of Anodic Metal Oxidation. Anal Chem 2024; 96:1129-1137. [PMID: 38197168 DOI: 10.1021/acs.analchem.3c04160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
The stark difference between global and local metal oxidation dynamics underscores the need for methodologies capable of performing precise sub-μm-scale and wide-field measurements. In this study, we present reflective microscopy as a tool developed to address this challenge, illustrated by the example of chronoamperometric Fe oxidation in a NaCl solution. Analysis at a local scale of 10 s of μm has revealed three distinct periods of Fe oxidation: the initial covering of the metal interface with a surface film, followed by the electrochemical conversion of the formed surface film, and finally, the in-depth oxidation of Fe. In addition, thermodynamic calculations and the quantitative analysis of changes in optical signal (light intensity), correlated with variations in refractive indexes, suggest the initial formation of maghemite, followed by its subsequent conversion to magnetite. The reactivity maps for all three periods are heterogeneous, which can be attributed to the preferential oxidation of certain crystallographic grains. Notably, at the global scale of 100 s of μm, reactivity initiates at the electrode border and progresses toward its center, demonstrating a unique pattern that is independent of the local metal structure. This finding underscores the significance of simultaneously employing sub-μm-precise, quantitative, and wide-field measurements for a comprehensive description of metal oxidation processes.
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Affiliation(s)
| | - Jean-Marc Noël
- ITODYS, CNRS, Université Paris Cité, 75013 Paris, France
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