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Plasma enhanced atomic layer deposition of thin film Li1+xMn2−xO4 for realization of all solid-state 3D lithium-ion microbatteries

Authors :
Jane P. Chang
Katherine L. Jungjohann
Bruce Dunn
Jinkyoung Yoo
Danielle M. Butts
Ryan Sheil
Source :
Journal of Vacuum Science & Technology A. 39:012408
Publication Year :
2021
Publisher :
American Vacuum Society, 2021.

Abstract

The plasma enhanced atomic layer deposition (PEALD) process for MnO2 was demonstrated, exhibiting self-limiting growth as well as stable composition and stable growth rate over a temperature window of 205–265 °C. The PEALD process for MnO2 was combined with the thermal ALD process for LiOH to synthesize Li1+xMn2−xO4 thin film cathodes, where the stoichiometry was effectively controlled to allow for crystallization in the electrochemically active spinel phase. A 3D nanostructure consisting of an Li1+xMn2−xO4 cathode layer, ALD LixAlySizO solid electrolyte, and SiGe nanowire anode was fabricated and characterized via TEM. The Li1+xMn2−xO4 thin films maintained 66% of the areal capacity upon a 100× increase in the rate (4–360 μA cm−2) as well as 97% capacity retention over 100 cycles at ∼5C. The ALD Li1+xMn2−xO4 thin films exhibited a volumetric capacity of 52 μAh cm−2 μm−1 at a C-rate of ∼0.5C and, coupled with the high operating voltage (4.0 V), offer some of best areal energy densities for ALD thin film cathodes, making it a viable material for integration with 3D lithium-ion microbatteries.

Details

ISSN :
15208559 and 07342101
Volume :
39
Database :
OpenAIRE
Journal :
Journal of Vacuum Science & Technology A
Accession number :
edsair.doi...........838de3492d375ea89fa6a3f8dbb4f93e