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Influence de l'électrolyte et/ou du liant sur la chimie de surface et les performances électrochimiques de l'électrode à base de Si et de l'électrode métallique Li pour batteries au lithium

Abstract : Lithium ion batteries (LIBs) are nowadays widely applied all over the world as the most popular energy storage device of portable electronic equipment and electric vehicles. However, the current commercial electrode materials for LIBs no longer meet the increasing demands of energy density, cycle life, rate capability. Therefore, it is imperative to develop new generation electrode materials to meet the requirement.Si has been considered as a promising candidate due to its low cost, natural abundance and especially its high theoretical capacity (3580 mAh g-1). However, Si suffers from large volume change during the charge/discharge processes, which results in material pulverizations and capacity fading. In addition, the huge volume change breaks the solid electrolyte interface (SEI) layer every cycle and results in the SEI continuous formation, which irreversibly consumes a considerable amount of the electrolyte.Li metal has been employed as the anode material for the earliest commercial rechargeable Li batteries in 1970s. However, growth of Li dendrites during electrodeposition inhibits its application for many years. The growth of Li dendrites not only causes the short circuit problem of the battery, but also makes Li trapped by the SEI layer around it and results in “dead Li” which decreases the coulombic efficiency. In recent years, with the developments of electrolytes, separators, and other battery components, the Li metal anode has attracted more and more research interests.As introduced above, the SEI layer plays a key role for the reversibility of Si-based anode and Li metal anode. In this work, the aim is to explore the SEI layer formation processes when influenced by different factors. Here the influence of electrolytes, additives and binders to the formation of SEI layer are chosen to be investigated.Several surface analytical techniques, such as X-ray Photoelectron Spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIRS) and Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) were applied to study the composition of SEI layer.
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Submitted on : Wednesday, July 13, 2022 - 3:53:11 PM
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Zhanyu Wu. Influence de l'électrolyte et/ou du liant sur la chimie de surface et les performances électrochimiques de l'électrode à base de Si et de l'électrode métallique Li pour batteries au lithium. Chimie analytique. Université Paris sciences et lettres, 2021. Français. ⟨NNT : 2021UPSLC005⟩. ⟨tel-03722801⟩

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