The synthetic method presented herein provides a simple, inexpensive and environmentally benign deposition route for the fabrication of inorganic solid electrolyte thin films at low temperatures.
An aqueous solution approach has been utilized to prepare
nanolaminates
of TiO2 and ionically conductive Li2O–Al2O3 (LiAlO). This new approach utilizes low curing
temperatures, resulting in fully oxidized films as demonstrated by
Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy.
The layered structures have been characterized by scanning electron
microscopy, X-ray diffraction, and X-ray reflectivity. Incorporation
of sufficiently thick (13 and 27 nm) ion blocking TiO2 layers
into nanolaminate structures with LiAlO layers resulted in an increase
in breakdown voltage by more than a factor of two, relative to LiAlO.
Nanolaminate structures also preserve the large double layer capacitance
of the ionically conductive layer. Increased breakdown strength coupled
with large capacitances results in a doubling of ultimate charge storage
capacity, illustrating how nanolaminates can be used to improve properties
relevant for energy/charge storage applications.
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