Journal
ADVANCED MATERIALS
Volume 32, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201905629
Keywords
current collectors; high-voltage systems; in situ polymerization; Li-metal batteries; solid-state polymer electrolytes
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Funding
- Department of Energy Basic Energy Sciences Program [DE-SC0016082] Funding Source: Medline
- NSF MRSEC [DMR-1719875] Funding Source: Medline
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Solid-state batteries enabled by solid-state polymer electrolytes (SPEs) are under active consideration for their promise as cost-effective platforms that simultaneously support high-energy and safe electrochemical energy storage. The limited oxidative stability and poor interfacial charge transport in conventional polymer electrolytes are well known, but difficult challenges must be addressed if high-voltage intercalating cathodes are to be used in such batteries. Here, ether-based electrolytes are in situ polymerized by a ring-opening reaction in the presence of aluminum fluoride (AlF3) to create SPEs inside LiNi0.6Co0.2 Mn0.2O2 (NCM) || Li batteries that are able to overcome both challenges. AlF3 plays a dual role as a Lewis acid catalyst and for the building of fluoridized cathode-electrolyte interphases, protecting both the electrolyte and aluminum current collector from degradation reactions. The solid-state NCM || Li metal batteries exhibit enhanced specific capacity of 153 mAh g(-1) under high areal capacity of 3.0 mAh cm(-2). This work offers an important pathway toward solid-state polymer electrolytes for high-voltage solid-state batteries.
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