Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 43, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202200335
Keywords
Li-7 NMR; biodegradable polymers; cross-linking; green chemistry; high-voltage cathodes; lithium metal batteries
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Funding
- German Federal Ministry of Education and Research (BMBF) [13XP0175A, 13XP0304A, 13XP0224A]
- Army Research Laboratory [W911NF-12-2-0023]
- Projekt DEAL
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This work introduces solid-state star polymer electrolytes (xBt-PCL) with robust stability and suppression of lithium dendrite deposition, showing high potential for high-voltage LMBs.
Solid polymer electrolytes (SPEs) have attracted considerable attention for high energy solid-state lithium metal batteries (LMBs). In this work, potentially ecofriendly, solid-state poly(epsilon-caprolactone) (PCL)-based star polymer electrolytes with cross-linked structures (xBt-PCL) are introduced that robustly cycle against LiNi0.6Mn0.2Co0.2O2 (NMC622) composite cathodes, affording long-term stability even at higher current densities. Their superior features allow for sufficient suppression of dendritic lithium deposits, as monitored by Li-7 solid-state NMR. Advantageous electrolyte|electrode interfacial properties derived from cathode impregnation with 1.5 wt% PCL enable decent cell performance until up to 500 cycles at rates of 1C (60 degrees C), illustrating the high potential of PCL-based SPEs for application in high-voltage LMBs.
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