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Binder-free germanium nanoparticle decorated multi-wall carbon nanotube anodes prepared via two-step electrophoretic deposition for high capacity Li-ion batteries

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posted on 2024-03-25, 12:32 authored by Xuan-Manh Pham, Syed Abdul AhadSyed Abdul Ahad, Niraj Nitish Patil, HUGH GEANEYHUGH GEANEY, SHALINI SINGHSHALINI SINGH, KEVIN M. RYANKEVIN M. RYAN

Germanium (Ge) has a high theoretical specific capacity (1384 mA h g −1 ) and fast lithium-ion diffusivity, which makes it an attractive anode material for lithium-ion batteries (LIBs). However, large volume changes during lithiation can lead to poor capacity retention and rate capability. Here, electrophoretic deposition (EPD) is used as a facile strategy to prepare Ge nanoparticle carbon-nanotube (Ge/CNT) electrodes. The Ge and CNT mass ratio in the Ge/CNT nanocomposites can be controlled by varying the deposition time, voltage, and concentration of the Ge NP dispersion in the EPD process. The optimized Ge/CNT nanocomposite exhibited long-term cyclic stability, with a capacity of 819 mA h g −1 after 1000 cycles at C/5 and a reversible capacity of 686 mA h g −1 after 350 cycles (with a minuscule capacity loss of 0.07% per cycle) at 1C. The Ge/CNT nanocomposite electrodes delivered dramatically improved cycling stability compared to control Ge nanoparticles. This can be attributed to the synergistic effects of implanting Ge into a 3D interconnected CNT network which acts as a buffer layer to accommodate the volume expansion of Ge NPs during lithiation/delithiation, limiting cracking and/or crumbling, to retain the integrity of the Ge/CNT nanocomposite electrodes.

Funding

Silicon Anodes through Nanostructural Development (SAND)

Science Foundation Ireland

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Multinary Compound Si, Ge and Sn Derived Nanocrystals: Composition, Shape and Heterostructure Control via Solution Methods (NanoIVCrystals)

Science Foundation Ireland

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History

Publication

Nanoscale Horizons, 2024

Publisher

Royal Society of Chemistry

Other Funding information

X.-M. P. acknowledges funding from the Irish Research Council (IRC) under Grant Number IRCLA/2017/285. K. M. R. acknowledges support from Science Foundation Ireland (SFI) under the Principal Investigator Program under contract no. 16/IA/4629 and under grant no. SFI 16/MERA/3419. S. S. and N. N. P. acknowledge the funding and support from the Department of Chemical Sciences, University of Limerick. S. A. A. and H. G. acknowledge support from Science Foundation Ireland under grant no. 18/SIRG/5484. The authors would also like to thank Dr Fathima Laffir (XPS instrument scientist – Bernal Institute) for help with XPS analysis.

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