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. 2022 Jun 13;15(12):4186.
doi: 10.3390/ma15124186.

Boosting Lithium Storage of a Metal-Organic Framework via Zinc Doping

Wenshan Gou  1 , Zhao Xu  1 , Xueyu Lin  2 , Yifei Sun  1 , Xuguang Han  1 , Mengmeng Liu  1 , Yan Zhang  1
Affiliations

Boosting Lithium Storage of a Metal-Organic Framework via Zinc Doping

Wenshan Gou et al. Materials (Basel). .

Abstract

Lithium-ion batteries (LIBs) as a predominant power source are widely used in large-scale energy storage fields. For the next-generation energy storage LIBs, it is primary to seek the high capacity and long lifespan electrode materials. Nickel and purified terephthalic acid-based MOF (Ni-PTA) with a series amounts of zinc dopant (0, 20, 50%) are successfully synthesized in this work and evaluated as anode materials for lithium-ion batteries. Among them, the 20% atom fraction Zn-doped Ni-PTA (Zn0.2-Ni-PTA) exhibits a high specific capacity of 921.4 mA h g-1 and 739.6 mA h g-1 at different current densities of 100 and 500 mA g-1 after 100 cycles. The optimized electrochemical performance of Zn0.2-Ni-PTA can be attributed to its low charge transfer resistance and high lithium-ion diffusion rate resulting from expanded interplanar spacing after moderate Zn doping. Moreover, a full cell is fabricated based on the LiFePO4 cathode and as-prepared MOF. The Zn0.2-Ni-PTA shows a reversible specific capacity of 97.9 mA h g-1 with 86.1% capacity retention (0.5 C) after 100 cycles, demonstrating the superior electrochemical performance of Zn0.2-Ni-PTA anode as a promising candidate for practical lithium-ion batteries.

Keywords: energy storage and conversion; lithium-ion batteries; metal-organic frameworks; zinc-ions doped.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Powder XRD pattern of the different atom fraction Znx-Ni-PTA samples. (b) The structure mode of Znx-Ni-PTA.
Figure 2
Figure 2
(a) FTIR pattern of the different atom fraction Znx-Ni-PTA samples. (b) Zn 2p and (c) Ni 2p spectra of Znx-Ni-PTA.
Figure 3
Figure 3
Electrochemical performance of Znx-Ni-PTA material: (a) CV curves and (b) voltage profiles of 20% atom fraction Zn-doped Ni-PTA. (c,e) Cycle and (d) rate performance of different MOFs.
Figure 4
Figure 4
(a) Nyquist plot of Zn0.2-Ni-PTA and Zn0-Ni-PTA. (b) Z’ vs. ω−1/2 plots in low frequency region.
Figure 5
Figure 5
(a) Charge–discharge curves, (b) rate performance and (c) cycle performance of Zn0.2-Ni-PTA/LiFePO4 full cell.
See this image and copyright information in PMC

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