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Cycle-dependent morphology and surface potential of germanium nanowire anode electrodes

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journal contribution
posted on 2023-07-27, 14:44 authored by Srikanth Kolagatla, Gearoid A. Collins, Jason I. Kilpatrick, Emrullah Kargin, KEVIN M. RYANKEVIN M. RYAN, Brian J Rodriguez

Germanium nanowire (GeNW) electrodes have shown great promise as high-power, fast-charging alternatives to silicon-based electrodes, owing to their vastly improved Li ion diffusion, electron mobility and ionic conductivity. Formation of the solid electrolyte interphase (SEI) on the anode surface is critical to electrode performance and stability but is not completely understood for NW anodes. Here, a systematic study characterizing pristine and cycled GeNWs in charged and discharged states with SEI layer present and removed is performed using Kelvin probe force microscopy in air. Correlating changes in the morphology of the GeNW anodes with contact potential difference mapping at different cycles provides insight into SEI layer formation and growth, and the effect of the SEI on battery performance.

Funding

Electrochemical force microscopy and quantum sensing of the solid-liquid interface: improving batteries through nanoscale electrochemical imaging

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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Silicon Alloying Anodes for High Energy Density Batteries comprising Lithium Rich Cathodes and Safe Ionic Liquid based Electrolytes for Enhanced High VoltagE Performance.

European Commission

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AMBER_Phase 2

Science Foundation Ireland

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MAREI_Phase 2

Science Foundation Ireland

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Confirm Centre for Smart Manufacturing

Science Foundation Ireland

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History

Publication

Chemical Communications, 2023, 59, pp. 9203-9206

Publisher

Royal Society of Chemistry

Other Funding information

K. M. R. further acknowledges IRCLA/2017/285

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  • Bernal Institute

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  • Chemical Sciences

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