Silicon is amongst the most attractive anode materials for Li-ion batteries because of its high gravimetric and volumetric capacity; importantly, it is also abundant and cheap, thus sustainable. For a widespread practical deployment of Si-based electrodes, research efforts must focus on significant breakthroughs to addressing the major challenges related to their poor cycling stability. In this work, we focus on the electrolyte-electrode relationships to support the scientific community with a systematic overview of Si-based cell design strategies reporting a thorough electrochemical study of different room temperature ionic liquid (RTIL)-based electrolytes, which contain either lithium bis(fluorosulfonyl)imide (LiFSI) or lithium bis(trifluoromethylsulfonyl)imide (LiTFSI). Their galvanostatic cycling performance with mixed silicon/graphite/few-layer graphene electrodes are evaluated, with first cycle coulombic efficiency approaching 90% and areal capacity ≈ 2 mAh cm-2 in the limited cut-off range of 0.1 - 2V vs. Li+/Li0. The investigation evidences the superior characteristics of the FSI-based RTILs with respect to the TFSI-based one, which is mostly associated with the superior SEI forming ability of FSI-based systems, even without the use of specific additives. In particular, the LiFSI-EMIFSI electrolyte composition shows the best performance in both Li-half cells and Li-ion cells in which the Si-based electrodes are coupled with 4V-class composite NMC-based cathodes.
An electrochemical compatibility investigation of {RTIL}-based electrolytes with Si-based anodes for advanced Li-ion batteries / Falco, Marisa; Lingua, Gabriele; Destro, Matteo; Silvestri, Laura; Meligrana, Giuseppina; Lin, Rongying; Fantini, S('(e))bastien; Maresca, Giovanna; Paolone, Annalisa; Brutti, Sergio; Appetecchi, Giovanni B.; Elia, GIUSEPPE ANTONIO; Gerbaldi, Claudio. - In: MATERIALS TODAY SUSTAINABILITY. - ISSN 2589-2347. - (2023), p. 100299. [10.1016/j.mtsust.2022.100299]
An electrochemical compatibility investigation of {RTIL}-based electrolytes with Si-based anodes for advanced Li-ion batteries
Giovanna Maresca;Annalisa Paolone;Sergio Brutti;Giovanni B. Appetecchi;Giuseppe Antonio Elia;
2023
Abstract
Silicon is amongst the most attractive anode materials for Li-ion batteries because of its high gravimetric and volumetric capacity; importantly, it is also abundant and cheap, thus sustainable. For a widespread practical deployment of Si-based electrodes, research efforts must focus on significant breakthroughs to addressing the major challenges related to their poor cycling stability. In this work, we focus on the electrolyte-electrode relationships to support the scientific community with a systematic overview of Si-based cell design strategies reporting a thorough electrochemical study of different room temperature ionic liquid (RTIL)-based electrolytes, which contain either lithium bis(fluorosulfonyl)imide (LiFSI) or lithium bis(trifluoromethylsulfonyl)imide (LiTFSI). Their galvanostatic cycling performance with mixed silicon/graphite/few-layer graphene electrodes are evaluated, with first cycle coulombic efficiency approaching 90% and areal capacity ≈ 2 mAh cm-2 in the limited cut-off range of 0.1 - 2V vs. Li+/Li0. The investigation evidences the superior characteristics of the FSI-based RTILs with respect to the TFSI-based one, which is mostly associated with the superior SEI forming ability of FSI-based systems, even without the use of specific additives. In particular, the LiFSI-EMIFSI electrolyte composition shows the best performance in both Li-half cells and Li-ion cells in which the Si-based electrodes are coupled with 4V-class composite NMC-based cathodes.File | Dimensione | Formato | |
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