High dielectric barium titanate porous scaffold for efficient Li metal cycling in anode-free cells

Chao Wang, Ming Liu, Michel Thijs, Frans G. B. Ooms, Swapna Ganapathy and Marnix Wagemaker ()
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Chao Wang: Delft University of Technology
Ming Liu: Delft University of Technology
Michel Thijs: Delft University of Technology
Frans G. B. Ooms: Delft University of Technology
Swapna Ganapathy: Delft University of Technology
Marnix Wagemaker: Delft University of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Li metal batteries are being intensively investigated as a means to achieve higher energy density when compared with standard Li-ion batteries. However, the formation of dendritic and mossy Li metal microstructures at the negative electrode during stripping/plating cycles causes electrolyte decomposition and the formation of electronically disconnected Li metal particles. Here we investigate the use of a Cu current collector coated with a high dielectric BaTiO3 porous scaffold to suppress the electrical field gradients that cause morphological inhomogeneities during Li metal stripping/plating. Applying operando solid-state nuclear magnetic resonance measurements, we demonstrate that the high dielectric BaTiO3 porous scaffold promotes dense Li deposition, improves the average plating/stripping efficiency and extends the cycling life of the cell compared to both bare Cu and to a low dielectric scaffold material (i.e., Al2O3). We report electrochemical tests in full anode-free coin cells using a LiNi0.8Co0.1Mn0.1O2-based positive electrode and a LiPF6-based electrolyte to demonstrate the cycling efficiency of the BaTiO3-coated Cu electrode.

Date: 2021
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DOI: 10.1038/s41467-021-26859-8

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