4.8 Article

Fluorine enhanced nucleophilicity of TiO2 nanorod arrays: A general approach for dendrite-free anodes towards high-performance metal batteries

期刊

NANO ENERGY
卷 93, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.nanoen.2021.106837

关键词

Metal anodes; TiO2 nanorod arrays; Fluorine; Dendrite-free; Metal anode batteries

资金

  1. National Natural Science Foundation of China [21922501, 21521005, 21991102]
  2. Fundamental Research Funds for the Central Universities [XK1802-6, XK1803-05, ZY2118]

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This study successfully induced homogeneous nucleation of Li, Na, K, and Zn by doping TiO2 nanorod arrays, achieving dendrite-free metal anodes. The constructed metal batteries exhibited significantly increased cycle life and performance. This work provides an important strategy for the development of dendrite-free metal anodes in various metal batteries.
The effective depress dendrite growth of metal anodes (such as lithium (Li), sodium (Na), potassium (K) and zinc (Zn)) have been widely considered for metal-based batteries. However, regarding varied metal batteries accompanied with different chemical environment (e.g, solvent effect, electronegativity and ion radius), it is a huge challenge to develop a general approach for construction of dendrite-free metal anodes. Herein, we report a strategy to induce Li, Na, K and Zn homogenous nucleation by 'F' hetematom doped TiO2 nanorod arrays. Theoretical calculations reveal that Li+, Zn2+, Na+ and K+ can be strong adhered to electronegative F hetematom, giving rise to an enhanced nucleophilicity. Consequently, the CC/TiO2-F based Li, Zn, Na and K symmetric cells exhibit remarkably enhanced long service life of 1100 h, 530 h, 720 h and 510 hat 2 mA cm(-2) with a low voltage hysteresis, which is 4.4, 26.5, 24.1 and 25.5 times higher than that of bare CC based anodes. Moreover, the CC/TiO2-F dendrite-free anode allows for construction of Li-LiFePO4/Sulfur full-batteries with a high capacity of 152 mA h g(-1) and 1070 mA h g(-1), respectively. Additionally, the assembled Li-S pouch cells also realized high stable capacity with high flexibility. This work provides an important strategy to develop general method for dendrite-free metal anodes towards high-performance metal batteries.

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