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Article Dans Une Revue Advanced Energy Materials Année : 2019

A New Electrolyte Formulation for Securing High Temperature Cycling and Storage Performances of Na‐Ion Batteries

Résumé

The Na-ion battery is recognized as a possible alternative to Li-ion battery for applications where power and cost override energy density performances. However, the increasing instability of their electrolyte with temperature is still problematic. Thus, a central question remains how to design Na-based electrolytes. Here, we report discovery of a Na-based electrolyte formulation which enlists four additives (vinylene carbonate (VC), succinonitrile (SN), 1, 3-propane sultone (PS) and sodium difluoro(oxalate)borate (NaODFB) in proper quantities that synergistically combined their positive attributes to lead a stable solid electrolyte interphase (SEI) at both negative and positive electrodes surface at 55 °C. Moreover, we rationalized the role of each additive that consists in producing specific NaF coatings, thin elastomers, sulfate-based deposits and so on via combined impedance (EIS) and X-ray photoelectron spectroscopy (XPS). We demonstrated that empirical electrolyte design rules previously established for Li-ion technology together with theoretical guidance is a vital strategy in the quest for better Na-based electrolytes that can be extended to other chemistries. Overall, this finding, which we implement to practical 18650 cells, widens the route to the rapid development of the Na-ion technology based on the Na 3 V 2 (PO 4) 2 F 3 /C chemistry.

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Dates et versions

hal-03028024 , version 1 (27-11-2020)

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Guochun Yan, Kyle Reeves, Dominique Foix, Zhujie Li, Claudio Cometto, et al.. A New Electrolyte Formulation for Securing High Temperature Cycling and Storage Performances of Na‐Ion Batteries. Advanced Energy Materials, 2019, 9 (41), pp.1901431. ⟨10.1002/aenm.201901431⟩. ⟨hal-03028024⟩
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