Effect of Liquid Electrolyte Soaking on the Interfacial Resistance of Li7La3Zr2O12 for All-Solid-State Lithium Batteries | Zendy

Münir M. Besli | Zendy; Camille Usubelli | Zendy; Michael Metzger | Zendy; Vikram Pande | Zendy; Katherine Harry | Zendy; Dennis Nordlund | Zendy; Sami Sainio | Zendy; Jake Christensen | Zendy; Marca M. Doeff | Zendy; Saravanan Kuppan | Zendy

Open Access

Effect of Liquid Electrolyte Soaking on the Interfacial Resistance of Li₇La₃Zr₂O₁₂ for All-Solid-State Lithium Batteries

Author(s) -

Münir M. Besli,

Camille Usubelli,

Michael Metzger,

Vikram Pande,

Katherine Harry,

Dennis Nordlund,

Sami Sainio,

Jake Christensen,

Marca M. Doeff,

Saravanan Kuppan

Publication year - 2020

Publication title -

acs applied materials and interfaces

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.535

H-Index - 228

eISSN - 1944-8252

pISSN - 1944-8244

DOI - 10.1021/acsami.0c06194

Subject(s) - materials science , lithium (medication) , electrolyte , solid state , chemical engineering , inorganic chemistry , chemistry , electrode , medicine , engineering , endocrinology

The impact of liquid electrolyte soaking on the interfacial resistance between the garnet-structured Li 7 La 3 Zr 2 O 12 (LLZO) solid electrolyte and metallic lithium has been studied. Lithium carbonate (Li 2 CO 3 ) formed by inadvertent exposure of LLZO to ambient conditions is generally known to increase interfacial impedance and decrease lithium wettability. Soaking LLZO powders and pellets in the electrolyte containing lithium tetrafluoroborate (LiBF 4 ) shows a significantly reduced interfacial resistance and improved contact between lithium and LLZO. Raman spectroscopy, X-ray diffraction, and soft X-ray absorption spectroscopy reveal how Li 2 CO 3 is continuously removed with increasing soaking time. On-line mass spectrometry and free energy calculations show how LiBF 4 reacts with surface carbonate to form carbon dioxide. Using a very simple and scalable process that does not involve heat-treatment and expensive coating techniques, we show that the Li-LLZO interfacial resistance can be reduced by an order of magnitude.

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