Blade-Coatable Hexagonal Boron Nitride Ionogel Electrolytes for Scalable Production of Lithium Metal Batteries

Cory M. Thomas, Woo Jin Hyun, Hsien Cheng Huang, Davy Zeng, Mark C. Hersam

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Solid-state electrolytes have attracted significant attention for rechargeable lithium-ion batteries due to their potential to enable higher energy density technologies and improve cell safety by removing volatile liquid electrolytes. However, existing solid-state electrolyte materials lack sufficient electrochemical performance or require expensive and time-consuming processing methods that have prevented their wide-scale adoption. Here, a blade-coatable hexagonal boron nitride ionogel electrolyte is introduced that exhibits high room temperature ionic conductivity (>1 mS cm-1), is stable against lithium metal anodes, and can be applied over a wide area in a thin (<40 μm) and crack-free film. Furthermore, this blade-coatable slurry has a tunable viscosity to enable its use in existing battery manufacturing infrastructure. The resulting blade-coated hBN ionogel electrolyte is employed in a lithium metal battery with a LiFePO4 cathode, exhibiting superlative rate capability at room temperature with a 78% capacity retention after 500 cycles at a rate of 1C.

Original languageAmerican English
Pages (from-to)1558-1565
Number of pages8
JournalACS Energy Letters
Volume7
Issue number4
DOIs
StatePublished - 30 Mar 2022
Externally publishedYes

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