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    • Anomalous interfacial stress generation and role of elasto-plasticity in mechanical failure of Si-based thin film anodes of Li-ion batteries

      G THAMARAI SELVI SHAILENDRA K JHA

      Volume 45 Published: 25 January 2022 Article ID 0023

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/045/0023

    • Keywords

       

      Li-ion battery; mechanical degradation; stress; elasto-plasticity; resistivity; stiffness.

    • Abstract

       

      To understand the reason for mechanical failure and capacity fading of Si-based composite thin film batteries, we have developed a lithiation-induced interfacial stress model. The role of electrochemical charging reaction process,stiffness-induced elasto-plastic deformation and relative change in resistivity in detail through regional material heterogeneity sensitivity exponent has been accounted for anomalous interfacial stress generation. The insight gained from theresults of state-of-health of the battery electrodes suggests that the transition of material from elastic to plastic behaviour and cracking at the interface are due to volume expansion, i.e., fully lithiated. Finally, the unified lithiation-induced stressmodel unravels the effect of embedded material heterogeneity parameters coupled with resistivity and stiffness and its anomalous dynamics at composite electrode–collector interface. The verification with the available experimental data inthe literature has also been made and hence providing a better insight into the origin of degradation and the evaluation of advanced battery electrodes.

    • Author Affiliations

       

      G THAMARAI SELVI1 2 SHAILENDRA K JHA2 3

      1. CSIR—Central Electrochemical Research Institute, Karaikudi 630006, India
      2. AcSIR—Academy of Scientific and Innovative Research, CSIR-HRDC Campus, Ghaziabad 201002, India
      3. CSIR—National Metallurgical Laboratory, Jamshedpur 831007, India

    • Dates

       
      Published
      25 January 2022
      Manuscript received
      14 April 2021
      Accepted
      22 September 2021
      Final version published online
      25 January 2022

    • Supplementary Material

       

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