Lattice expanding by Te-substitution to boost electrochemical Mg storage of Cu7.2S4 nanotube cathode

Changliang Du; Youqi Zhu; Xinyu Yang; Zhao Lv; Jiachen Tian; Xiao Pei; Xin Liu; Xilan Ma; Jianhua Hou; Chuanbao Cao

doi:10.1016/j.cej.2023.141345

Lattice expanding by Te-substitution to boost electrochemical Mg storage of Cu_7.2S₄ nanotube cathode

Changliang Du, Youqi Zhu^*, Xinyu Yang, Zhao Lv, Jiachen Tian, Xiao Pei, Xin Liu, Xilan Ma, Jianhua Hou, Chuanbao Cao

^*Corresponding author for this work

School of Material Science and Engineering

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Cation-rich Cu_7.2S₄ with high Cu²⁺ mobility has been researched as a promising cathode candidate for rechargeable magnesium batteries, yet suffers from large polarization and sluggish kinetics resulted from strong electrostatic interactions among host lattice and high-charge Mg²⁺. Herein, lattice expansion by in-situ anion-substitution with heavy element tellurium is presented to regulate the redox chemistry of Cu_7.2S₄ nanotube cathode. Benefitting from lattice tailoring, the Te-substituted Cu_7.2S₄ nanotube cathode delivers ultra-high discharge capacity of 354.1 mAh g⁻¹ at 0.1 A g⁻¹ and remarkable rate capability of 85.1 mAh g⁻¹ at large current loading of 2.0 A g⁻¹. The ultra-long cycling stability is achieved for 2000 cycles with 0.0277 % capacity decay per cycle. The significant improvement of Mg²⁺ storage performances of Te-substituted Cu_7.2S₄ nanotube can be attributed to the reinforced Te-substitution, that can generate lattice expansion and effectively adjust the Mg²⁺ storage reaction. The present lattice regulation strategy holds the great potential in electrode material modification for improving battery chemistry.

Original language	English
Article number	141345
Journal	Chemical Engineering Journal
Volume	458
DOIs	https://doi.org/10.1016/j.cej.2023.141345
Publication status	Published - 15 Feb 2023

Keywords

Anion substitution
Cathode
CuS nanotubes
Lattice expansion
Rechargeable magnesium batteries

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Du, C., Zhu, Y., Yang, X., Lv, Z., Tian, J., Pei, X., Liu, X., Ma, X., Hou, J., & Cao, C. (2023). Lattice expanding by Te-substitution to boost electrochemical Mg storage of Cu_7.2S₄ nanotube cathode. Chemical Engineering Journal, 458, Article 141345. https://doi.org/10.1016/j.cej.2023.141345

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title = "Lattice expanding by Te-substitution to boost electrochemical Mg storage of Cu7.2S4 nanotube cathode",

abstract = "Cation-rich Cu7.2S4 with high Cu2+ mobility has been researched as a promising cathode candidate for rechargeable magnesium batteries, yet suffers from large polarization and sluggish kinetics resulted from strong electrostatic interactions among host lattice and high-charge Mg2+. Herein, lattice expansion by in-situ anion-substitution with heavy element tellurium is presented to regulate the redox chemistry of Cu7.2S4 nanotube cathode. Benefitting from lattice tailoring, the Te-substituted Cu7.2S4 nanotube cathode delivers ultra-high discharge capacity of 354.1 mAh g−1 at 0.1 A g−1 and remarkable rate capability of 85.1 mAh g−1 at large current loading of 2.0 A g−1. The ultra-long cycling stability is achieved for 2000 cycles with 0.0277 % capacity decay per cycle. The significant improvement of Mg2+ storage performances of Te-substituted Cu7.2S4 nanotube can be attributed to the reinforced Te-substitution, that can generate lattice expansion and effectively adjust the Mg2+ storage reaction. The present lattice regulation strategy holds the great potential in electrode material modification for improving battery chemistry.",

keywords = "Anion substitution, Cathode, CuS nanotubes, Lattice expansion, Rechargeable magnesium batteries",

author = "Changliang Du and Youqi Zhu and Xinyu Yang and Zhao Lv and Jiachen Tian and Xiao Pei and Xin Liu and Xilan Ma and Jianhua Hou and Chuanbao Cao",

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AU - Du, Changliang

AU - Zhu, Youqi

AU - Yang, Xinyu

AU - Lv, Zhao

AU - Tian, Jiachen

AU - Pei, Xiao

AU - Liu, Xin

AU - Ma, Xilan

AU - Hou, Jianhua

AU - Cao, Chuanbao

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N2 - Cation-rich Cu7.2S4 with high Cu2+ mobility has been researched as a promising cathode candidate for rechargeable magnesium batteries, yet suffers from large polarization and sluggish kinetics resulted from strong electrostatic interactions among host lattice and high-charge Mg2+. Herein, lattice expansion by in-situ anion-substitution with heavy element tellurium is presented to regulate the redox chemistry of Cu7.2S4 nanotube cathode. Benefitting from lattice tailoring, the Te-substituted Cu7.2S4 nanotube cathode delivers ultra-high discharge capacity of 354.1 mAh g−1 at 0.1 A g−1 and remarkable rate capability of 85.1 mAh g−1 at large current loading of 2.0 A g−1. The ultra-long cycling stability is achieved for 2000 cycles with 0.0277 % capacity decay per cycle. The significant improvement of Mg2+ storage performances of Te-substituted Cu7.2S4 nanotube can be attributed to the reinforced Te-substitution, that can generate lattice expansion and effectively adjust the Mg2+ storage reaction. The present lattice regulation strategy holds the great potential in electrode material modification for improving battery chemistry.

AB - Cation-rich Cu7.2S4 with high Cu2+ mobility has been researched as a promising cathode candidate for rechargeable magnesium batteries, yet suffers from large polarization and sluggish kinetics resulted from strong electrostatic interactions among host lattice and high-charge Mg2+. Herein, lattice expansion by in-situ anion-substitution with heavy element tellurium is presented to regulate the redox chemistry of Cu7.2S4 nanotube cathode. Benefitting from lattice tailoring, the Te-substituted Cu7.2S4 nanotube cathode delivers ultra-high discharge capacity of 354.1 mAh g−1 at 0.1 A g−1 and remarkable rate capability of 85.1 mAh g−1 at large current loading of 2.0 A g−1. The ultra-long cycling stability is achieved for 2000 cycles with 0.0277 % capacity decay per cycle. The significant improvement of Mg2+ storage performances of Te-substituted Cu7.2S4 nanotube can be attributed to the reinforced Te-substitution, that can generate lattice expansion and effectively adjust the Mg2+ storage reaction. The present lattice regulation strategy holds the great potential in electrode material modification for improving battery chemistry.

KW - Anion substitution

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Lattice expanding by Te-substitution to boost electrochemical Mg storage of Cu_7.2S₄ nanotube cathode

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