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Single-Wire Model for Silicon Microwire Electrode of Lithium-ion Batteries
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  • Hamzeh Beiranvand ,
  • Sandra Hansen,
  • Rainer Adelung,
  • Stephan Wulfinghoff
Hamzeh Beiranvand

Corresponding Author:[email protected]

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Sandra Hansen
Rainer Adelung
Stephan Wulfinghoff

Abstract

Silicon (Si) has a high theoretical gravimetric capacity and can replace the graphite in the negative electrode of lithium-ion batteries. Among numerous Si electrode geometries, the Si microwire (SiMW) geometry shows a promising performance compared to Si wafers and particles and alleviates the mechanical instability during lithiation/delithiation process due to high volume expansion/contraction. In this paper, a single-wire model (SWM) is proposed for lithium-ion battery half-cell composed of SiMWs as the positive electrode and lithium metal as the negative/reference electrode. In the proposed SWM, an array of SiMWs is modeled by only one equivalent micro-scale wire. The SWM is the simplest model that incorporates the electrochemical behavior with a minimal computational effort suitable for real-time applications. Despite its simplicity, it is equivalent to a one-dimensional (1D) model of conventional graphite-based lithium-ion batteries. Both numerical and experimental results on a 2.5 mA SiMW half-cell sample, are provided to verify of the proposed SWM.
22 Feb 2024Submitted to TechRxiv
27 Feb 2024Published in TechRxiv