Issue 32, 2022

Practical conversion-type titanium telluride anodes for high-capacity long-lifespan rechargeable aqueous zinc batteries

Abstract

Rechargeable aqueous zinc batteries (RAZBs) with high safety and low cost offer great hopes for complementing lithium-ion batteries. However, realizing practical high-safety and long-lifespan RAZBs is held back by the low coulombic efficiency and non-negligible dendrite issues in Zn anodes. Here, we report a layered TiTe2 prepared by a one-step vacuum sintering technique as the metal-free anode for RAZBs, bypassing the above challenges of Zn metal. The density functional theory (DFT) calculations with ab initio molecular dynamics (AIMD) simulations predict the Zn-storage mechanism, thermodynamic stability, and ionic mobility properties of TiTe2. The TiTe2 electrode in the half cell shows a low charging voltage (∼0.7 V vs. Zn2+/Zn), a high reversible capacity of 225 mA h g−1 at 0.1 A g−1, and stable cycling properties with a 95% capacity retention over an exceptionally long life of 30 000 cycles at 5 A g−1. As demonstrated by in situ diffraction and ex situ spectra, the sustained high reversible capacity relies on the conversion chemistry involving the ZnTe formation/dissociation process with the charge compensation by two-electron redox of Ti2+/Ti4+. In regard to practical implementation, the TiTe2‖ZnxCo3O4 pouch-type full battery displays a competitive energy density of 149 W h kg−1 on the electrode level, exceeding state-of-the-art metal-free RAZBs. A high capacity retention of 94% is achieved in the pouch cells over 5000 cycles, verifying the bright application prospects of the TiTe2 anode.

Graphical abstract: Practical conversion-type titanium telluride anodes for high-capacity long-lifespan rechargeable aqueous zinc batteries

Supplementary files

Article information

Article type
Paper
Submitted
21 Jun 2022
Accepted
21 Jul 2022
First published
24 Jul 2022

J. Mater. Chem. A, 2022,10, 16976-16985

Practical conversion-type titanium telluride anodes for high-capacity long-lifespan rechargeable aqueous zinc batteries

Y. Du, B. Zhang, R. Kang, W. Zhou, J. Qin, J. Wan, J. Zhang and G. Chen, J. Mater. Chem. A, 2022, 10, 16976 DOI: 10.1039/D2TA04912K

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