Abstract :
[en] Lithium ion batteries are rapidly becoming the technology of choice for the electricity storage. In fact, lithium ion battery technology offers the highest energy density among the rechargeable battery technologies; however lithium ion batteries are limited by availability of materials, price and safety. Sodium-ion batteries are actually considered to be an alternative to Li-ion batteries owing to the natural abundance of sodium (1, 2).
Much effort has been expended in search for new efficient anode materials for Li and Na ion batteries. In fact, promising new materials with high energy density are required. Silicon, tin and antimony based materials were investigated due to their high specific capacity compared to other anode materials (3, 4). The major drawback of these metals is the large volume expansion occurring during their reaction with Na or Li. In order to minimize the changes of volume, researches have been directed towards the use of intermetallic (5, 6).
This presentation will focus on the structural and electrochemical characterization of the Sb-based electrode materials versus sodium. In order to accurately identify the resulting phases of the reaction of the electrode with Na, model compounds have been prepared and characterized. In this study, the reaction mechanisms were established combining several techniques of characterization such as Galvanostatic electrochemical tests, operando X-ray Diffraction and ex situ 121Sb Mössbauer spectroscopy. References
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