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A Multielectron-Reaction and Low-Strain Na3.5Fe0.5VCr0.5(PO4)3 Cathode for Na-Ion Batteries AITranslate

Han Li; Yao Wang; Xudong Zhao; Junteng Jin; Qiuyu Shen; Jie Li; Yukun Liu; Xuanhui Qu; Lifang Jiao; Yongchang Liu;
University of Science and Technology Beijing; University of Science and Technology Beijing; Tianjin University of Technology; University of Science and Technology Beijing; University of Science and Technology Beijing; University of Science and Technology Beijing; University of Science and Technology Beijing; University of Science and Technology Beijing; Nankai University; Nankai University
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Publisher: ACS
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Abstract AITranslate

Natrium superionic conductor (NASICON)-type phosphates have attracted widespread attention as cathodes for sodium-ion batteries (SIBs) due to their 3D open frameworks facilitating Na+ diffusion, but they are characterized by mediocre energy density or rapid capacity decay. Herein, we delicately design a multielectron-reaction and low-strain Na3.5Fe0.5VCr0.5(PO4)3/C cathode material featuring a high working voltage (∼3.43 V), high reversible capacity (148.5 mAh g–1), and high cycling stability (95.1% capacity retention over 2000 cycles). The deviation in the reaction potential of each redox couple (Fe2+/Fe3+, V3+/V4+/V5+, and Cr3+/Cr4+) efficaciously alleviates the lattice strain accumulation, ensuring a small cell volume variation of 3.87% during the highly reversible charge–discharge processes, as confirmed by systematic in situ/ex situ analyses. Moreover, the fast reaction kinetics and the unexpected reversible Na1-ion (6b site) release/uptake are elucidated via multiple electrochemical characterizations and theoretical computations. This rational design strategy of incorporating versatile redox couples with different roles will broaden the horizons of high-performance NASICON-type cathodes.

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DOI：https://doi.org/10.1021/acsenergylett.3c01183

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Citation Information:

Natrium superionic conductor (NASICON)-type phosphates have attracted widespread attention as cathodes for sodium-ion batteries (SIBs) due to their 3D open frameworks facilitating Na+ diffusion, but they are characterized by mediocre energy density or rapid capacity decay. Herein, we delicately design a multielectron-reaction and low-strain Na3.5Fe0.5VCr0.5(PO4)3/C cathode material featuring a high working voltage (∼3.43 V), high reversible capacity (148.5 mAh g–1), and high cycling stability (95.1% capacity retention over 2000 cycles). The deviation in the reaction potential of each redox couple (Fe2+/Fe3+, V3+/V4+/V5+, and Cr3+/Cr4+) efficaciously alleviates the lattice strain accumulation, ensuring a small cell volume variation of 3.87% during the highly reversible charge–discharge processes, as confirmed by systematic in situ/ex situ analyses. Moreover, the fast reaction kinetics and the unexpected reversible Na1-ion (6b site) release/uptake are elucidated via multiple electrochemical characterizations and theoretical computations. This rational design strategy of incorporating versatile redox couples with different roles will broaden the horizons of high-performance NASICON-type cathodes.

quote

GB/T 7714-2015 [1] Han Li, Yao Wang, Xudong Zhao, et al. ACS Energy Letters, 2023(8). DOI:10.1021/acsenergylett.3c01183.
MLA [1] Han Li, et al., ACS Energy Letters, no. 8, 2023, https://doi.org/10.1021/acsenergylett.3c01183.
APA [1] Han Li, Yao Wang, Xudong Zhao, Junteng Jin, Qiuyu Shen, Jie Li, Yukun Liu, Xuanhui Qu, Lifang Jiao, & Yongchang Liu. (2023). ACS Energy Letters(8). https://doi.org/10.1021/acsenergylett.3c01183
IEEE [1] Han Li, Yao Wang, Xudong Zhao, Junteng Jin, Qiuyu Shen, Jie Li, Yukun Liu, Xuanhui Qu, Lifang Jiao, and Yongchang Liu, ACS Energy Letters, no. 8, 2023, doi: 10.1021/acsenergylett.3c01183.