Sodium Borates: Expanding the Electrolyte Selection for Sodium‐Ion Batteries
Authors
Ould, Darren MC
Coowar, Fazlil
Barker, Jerry
Publication Date
2022-08-08Journal Title
Angewandte Chemie
ISSN
0044-8249
Publisher
Wiley
Language
en
Type
Article
This Version
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Ould, D. M., Menkin, S., Smith, H. E., Riesgo‐Gonzalez, V., Jónsson, E., O'Keefe, C. A., Coowar, F., et al. (2022). Sodium Borates: Expanding the Electrolyte Selection for Sodium‐Ion Batteries. Angewandte Chemie https://doi.org/10.1002/ange.202202133
Abstract
Abstract: Sodium‐ion batteries (SIBs) are a promising grid‐level storage technology due to the abundance and low cost of sodium. The development of new electrolytes for SIBs is imperative since it impacts battery life and capacity. Currently, sodium hexafluorophosphate (NaPF6) is used as the benchmark salt, but is highly hygroscopic and generates toxic HF. This work describes the synthesis of a series of sodium borate salts, with electrochemical studies revealing that Na[B(hfip)4]⋅DME (hfip=hexafluoroisopropyloxy, OiPrF) and Na[B(pp)2] (pp=perfluorinated pinacolato, O2C2(CF3)4) have excellent electrochemical performance. The [B(pp)2]− anion also exhibits a high tolerance to air and water. Both electrolytes give more stable electrode‐electrolyte interfaces than conventionally used NaPF6, as demonstrated by impedance spectroscopy and cyclic voltammetry. Furthermore, they give greater cycling stability and comparable capacity to NaPF6 for SIBs, as shown in commercial pouch cells.
Keywords
Forschungsartikel, Batteries, Electrolytes, Main Group Synthesis, SEI, Sodium-Ion Batteries
Sponsorship
European Commission Horizon 2020 (H2020) ERC (835073)
Identifiers
ange202202133
External DOI: https://doi.org/10.1002/ange.202202133
This record's URL: https://www.repository.cam.ac.uk/handle/1810/336844
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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