التفاصيل البيبلوغرافية
| العنوان: |
Understanding the partial substitution effect of Mg in Zn-V aqueous batteries. |
| المؤلفون: |
He, Hanbing1 (AUTHOR), Luo, Zexiang1 (AUTHOR), Liu, Zhen1 (AUTHOR), Zhang, Zhihao1 (AUTHOR), Chen, Yong1 (AUTHOR), Deng, Qi2 (AUTHOR), Chen, Xiaobin3 (AUTHOR), Chen, Wenmi1 (AUTHOR), Zeng, Jing1 (AUTHOR) zengjing@csu.edu.cn |
| المصدر: |
Journal of Electroanalytical Chemistry. Jan2023, Vol. 929, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*ELECTROCHEMICAL electrodes, *VANADIUM dioxide, *DOPING agents (Chemistry), *CATHODES, *STORAGE batteries, *MAGNESIUM ions, *ELECTRIC batteries |
| مستخلص: |
• Mg2+ is doped into the HVO to tune its structure through inserting into the lattice spacing of tunnel framework or substituting V4+ in the octahedron. • The insertion of free Mg2+ effectively widens the layer spacing and the formation of Mg-O bond stabilizes the cathode structure. However, excess Mg-O bonds will hinder zinc transport and reduce capacity. • When the doping amount of Mg2+ is 2 mmol, MgHVO gets appropriate layer spacing and stable structure, resulting in the excellent electrochemical performance. Although vanadium dioxide with various valence states, high theoretical capacity and low cost have been demonstrated as the ideal cathode materials for aqueous zinc-ion batteries (AZIBs), its unstable structure inhibits its further development. Herein, a structurally stable magnesium doped vanadium dioxide (Mg 0.16 VO 2 ·0.34H 2 O) was prepared by a simple hydrothermal reaction. The regular of pre-intercalation Mg2+ on the structural and electrochemical properties of cathode was further explored through varying the doping amount of Mg2+. According to the experimental results, a small amount of Mg2+ insertion is not sufficient to stabilize the cathode, while excessive Mg2+ insertion will reduce capacity. The optimal parameter was obtained when the doping content of Mg2+ was 2 mmol, MgHVO/Zn batteries get specific capacity (315.4 mAh/g at a current density of 1 A/g) and outstanding long circulation stability (the capacity retention of 86.36 % over 10,00 cycles even at 5 A/g). And the electrochemical mechanism was explained by a series of in situ tests. This work reveals the regulation of the cathode structure by pre-intercalation Mg2+ and provides some insights for future pre-intercalation cathode regulation. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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