Unveiling the stability of Sn/Si/graphite composites for Li-ion storage by physical, electrochemical and computational tools - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2021

Unveiling the stability of Sn/Si/graphite composites for Li-ion storage by physical, electrochemical and computational tools

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Andrés Ruderman
  • Fonction : Auteur
Sacha Smrekar
M. Victoria Bracamonte
  • Fonction : Auteur
Guillermina Luque
  • Fonction : Auteur
Jorge Thomas
  • Fonction : Auteur
Ezequiel Leiva
  • Fonction : Auteur
Gustavo Monti
Daniel Barraco
  • Fonction : Auteur
Fabián Vaca Chávez

Résumé

Complex materials composed of two and three elements with high Li-ion storage capacity are investigated and tested as lithium-ion battery (LiB) negative electrodes. Namely, anodes containing tin, silicon, and graphite show very good performance because of the large gravimetric and volumetric capacity of silicon and structural support provided by tin and graphite. The performance of the composites during the first cycles was studied using ex situ magic angle spinning (MAS) Li-7 Nuclear Magnetic Resonance (NMR), density functional theory (DFT) calculations, and electrochemical techniques. The best performance was obtained for Sn/Si/graphite in a 1 : 1 : 1 proportion, due to an emergent effect of the interaction between Sn and Si. The results suggest a stabilization effect of Sn over Si, providing a physical constraint that prevents Si pulverization. This mechanism ensures good cyclability over more than one hundred cycles, low capacity fading and high specific capacity.

Domaines

Chimie Matériaux
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Dates et versions

hal-03613022 , version 1 (18-03-2022)

Identifiants

Citer

Andrés Ruderman, Sacha Smrekar, M. Victoria Bracamonte, Emiliano Primo, Guillermina Luque, et al.. Unveiling the stability of Sn/Si/graphite composites for Li-ion storage by physical, electrochemical and computational tools. Physical Chemistry Chemical Physics, 2021, 23 (5), pp.3281-3289. ⟨10.1039/d0cp05501h⟩. ⟨hal-03613022⟩
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