Deposition and Confinement of Li Metal along an Artificial Lipon-Lipon Interface

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Abstract

Lithium phosphorus oxynitride (Lipon) is an amorphous solid-state electrolyte that can completely suppress Li penetration from the anode to the cathode, commonly referred to as dendrites. The key to the Lipon performance is thought to be its homogeneous and pore-free morphology. To test this, we present a modified thin film battery configuration with a lithium cobalt oxide cathode, a Lipon electrolyte, and a top layer with a copper current collector and an artificial Lipon-Lipon interface parallel to the cathode. Upon electrochemical cycling, Li metal rapidly deposits at the edge of this Cu current collector and then proceeds to plate along the 2D Lipon-Lipon interface. As the Li is confined to this 2D plane, it confirms the ability of Lipon to suppress Li penetration. It also demonstrates that the homogeneous interface-free morphology of Lipon is key to its performance.

Original languageEnglish
Pages (from-to)651-655
Number of pages5
JournalACS Energy Letters
Volume4
Issue number3
DOIs
StatePublished - Mar 8 2019

Funding

*E-mail: [email protected]. *E-mail: [email protected]. ORCID Andrew S. Westover: 0000-0002-5738-1233 Robert L. Sacci: 0000-0002-0073-5221 Author Contributions The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. Funding Funding for this work was provided by the U.S. Department of Energy, Advanced Research Projects Agency for Energy (ARPA-E) through the IONICS program led by Paul Albertus, Award No. DE-AR0000775. Supporting COMSOL calculations were funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. Notes The authors declare no competing financial interest.

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