Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 23, Pages 12931-12940Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202101537
Keywords
3D electrolyte infiltration; interfacial engineering; nanostructured thin-film batteries; polymer-in-salt electrolytes; solid-state lithium batteries
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A solid-state lithium battery with high room-temperature ionic conductivity was designed, achieving faster Li+ transport and superior electrochemical performance through the construction of an integrated model SSLB.
Solid-state lithium batteries (SSLBs) are promising owing to enhanced safety and high energy density but plagued by the relatively low ionic conductivity of solid-state electrolytes and large electrolyte-electrode interfacial resistance. Herein, we design a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based polymer-in-salt solid electrolyte (PISSE) with high room-temperature ionic conductivity (1.24x10(-4) S cm(-1)) and construct a model integrated TiO2/Li SSLB with 3D fully infiltration of solid electrolyte. With forming aggregated ion clusters, unique ionic channels are generated in the PISSE, providing much faster Li+ transport than common polymer electrolytes. The integrated device achieves maximized interfacial contact and electrochemical and mechanical stability, with performance close to liquid electrolyte. A pouch cell made of 2 SSLB units in series shows high voltage plateau (3.7 V) and volumetric energy density comparable to many commercial thin-film batteries.
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