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A New Electrolyte Formulation for Securing High Temperature Cycling and Storage Performances of Na‐Ion Batteries
Author(s) -
Yan Guochun,
Reeves Kyle,
Foix Dominique,
Li Zhujie,
Cometto Claudio,
Mariyappan Sathiya,
Salanne Mathieu,
Tarascon JeanMarie
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201901431
Subject(s) - electrolyte , materials science , battery (electricity) , ion , x ray photoelectron spectroscopy , chemical engineering , electrochemistry , electrode , inorganic chemistry , chemistry , power (physics) , organic chemistry , physics , thermodynamics , engineering
The Na‐ion battery is recognized as a possible alternative to the Li‐ion battery for applications where power and cost override energy density performance. However, the increasing instability of their electrolyte with temperature is still problematic. Thus, a central question remains how to design Na‐based electrolytes. Here, the discovery of a Na‐based electrolyte formulation is reported which enlists four additives (vinylene carbonate, succinonitrile, 1,3‐propane sultone, and sodium difluoro(oxalate)borate) in proper quantities that synergistically combine their positive attributes to enable a stable solid electrolyte interphase at both negative and positive electrodes surface at 55 °C. Moreover, the role of each additive that consists in producing specific NaF coatings, thin elastomers, sulfate‐based deposits, and so on via combined impedance and X‐ray photoelectron spectroscopy is rationalized. It is demonstrated that empirical electrolyte design rules previously established for Li‐ion technology together with theoretical guidance is vital in the quest for better Na‐based electrolytes that can be extended to other chemistries. Overall, this finding, which is implemented to 18 650 cells, widens the route to the rapid development of the Na‐ion technology based on Na 3 V 2 (PO 4 ) 2 F 3 /C chemistry.