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| Home > Publications database > Radical Polymer‐based Positive Electrodes for Dual‐Ion Batteries: Enhancing Performance with γ‐Butyrolactone‐based Electrolytes |
| Home > Publications database > Radical Polymer‐based Positive Electrodes for Dual‐Ion Batteries: Enhancing Performance with γ‐Butyrolactone‐based Electrolytes |
| Journal Article | FZJ-2024-05232 |
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2024
Wiley-VCH
Weinheim
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Please use a persistent id in citations: doi:10.1002/cssc.202400626 doi:10.34734/FZJ-2024-05232
Abstract: Dual-ion batteries (DIBs) represent a promising alternative for lithium ion batteries (LIBs) for various niche applications. DIBs with polymer-based active materials, here poly(2,2,6,6-tetramethylpiperidinyl-N-oxyl methacrylate) (PTMA), are of particular interest for high power applications, though they require appropriate electrolyte formulations. As the anion mobility plays a crucial role in transport kinetics, Li salts are varied using the well-dissociating solvent γ-butyrolactone (GBL). Lithium difluoro(oxalate)borate (LiDFOB) and lithium bis(oxalate)borate (LiBOB) improve cycle life in PTMA||Li metal cells compared to other Li salts and a LiPF6- and carbonate-based reference electrolyte, even at specific currents of 1.0 A g−1 (≈10C), whereas LiDFOB reveals a superior rate performance, i. e., ≈90 % capacity even at 5.0 A g−1 (≈50C). This is attributed to faster charge-transfer/mass transport, enhanced pseudo-capacitive contributions during the de-/insertion of the anions into the PTMA electrode and to lower overpotentials at the Li metal electrode.
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