Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 33, Pages 18335-18343Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202107667
Keywords
all-solid-state batteries; eutectic phenomenon; high-voltage cells; interfaces; polymer electrolytes
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Funding
- National Natural Science Foundation of China [21875016]
- National Natural Science Foundation of Beijing [2212014]
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The study demonstrates that poly-oxalates prepared from diols with an odd number of carbons show higher ionic conductivity, and the use of trifluoroacetate as the terminating unit can improve the antioxidative capability of the electrolyte, thus enhancing stability.
The relatively narrow electrochemical steady window and low ionic conductivity are two critical challenges for Li+-conducting solid polymer electrolytes (SPE). Here, a family of poly-oxalate(POE) structures were prepared as SPE; among them, POEs composed from diols with an odd number of carbons show higher ionic conductivity than those composed from diols with an even number of carbons, and the POE composed from propanediol (C5-POE) has the highest Li+ conductivity. The HOMO (highest occupied molecular orbital) electrons of POE were found located on the terminal units. When using trifluoroacetate as the terminating unit (POE-F), not only does the HOMO become more negative, but also the HOMO electrons shift to the middle oxalate units, improving the antioxidative capability. Furthermore, the interfacial compatibility across the Li-metal/POE-F is also improved by the generation of a LiF-based solid-electrolyte-interlayer(SEI). With the trifluoroacetate-terminated C5-POE (C5-POE-F) as the electrolyte and Li+-conducting binder in the cathode, the all-solid-state Li/LiNi0.8Mn0.1Co0.1O2(NMC811) cells showed significantly improved stability than the counterpart with poly-ether, providing a promising candidate for the forthcoming all-solid-state high-voltage Li-metal batteries.
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