Sodium Borates: Expanding the Electrolyte Selection for Sodium‐Ion Batteries
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, b...
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Published in | Angewandte Chemie International Edition Vol. 61; no. 32; pp. e202202133 - n/a |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
WEINHEIM
Wiley
08.08.2022
Wiley Subscription Services, Inc John Wiley and Sons Inc |
Edition | International ed. in English |
Subjects | |
Online Access | Get full text |
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Summary: | 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.
Sodium‐ion batteries (SIBs) are a promising technology for grid‐level storage, but require electrolytes specifically optimized for them. This work showcases the synthesis of a series of sodium borate salts that can act as electrolytes for SIBs. Electrochemical studies reveal Na[B(hfip)4]⋅DME (hfip=hexafluoroisopropyloxy, OiPrF) and Na[B(pp)2] (pp=perfluorinated pinacolato, O2C2(CF3)4) are excellent alternatives to conventionally used NaPF6. |
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Bibliography: | European Research Council (ERC) ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1433-7851 1521-3773 1521-3773 |
DOI: | 10.1002/anie.202202133 |