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Atomic/Molecular Layer-Deposited Laminated LiO-Lithicone Interfaces Enabling High-Performance Silicon Anodes. | LitMetric

Atomic/Molecular Layer-Deposited Laminated LiO-Lithicone Interfaces Enabling High-Performance Silicon Anodes.

ACS Appl Mater Interfaces

Laboratory of Material Surface Engineering and Nanofabrication, Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Xi'an 710065, People's Republic of China.

Published: June 2023

AI Article Synopsis

Article Abstract

Silicon-based materials are of long-standing interest as the anodes for next-generation lithium-ion batteries, yet their low initial Coulombic efficiency and poor interfacial stability are lethal limitations. In this work, we used atomic layer deposition (ALD) and molecular layer deposition (MLD) techniques to fabricate a lithium-containing laminated LiO-lithicone hybrid film (∼5 nm) on a silicon electrode. The laminated film provides an additional surface Li source around silicon cores, which can partially reimburse the Li loss during battery cycling. Characterization of interfacial components shows that such a laminated LiO-lithicone interface undergoes gentle element changes and participates in a hybrid solid electrolyte interphase with LiCO, LiO, LiPOF, and LiF species. Finite element model analysis and morphology characterization demonstrate that the laminated structure design can help relieve the interfacial stress and thus retain the integrity and reactivity of the silicon composite anode during cycling. Moreover, the lithium-based laminated film leads to a fast Li migration kinetics on the surface of the electrode as revealed by the galvanostatic intermittent titration technique and density functional theory calculation. Benefiting from the above merits, a silicon anode with a 91.2% initial Coulombic efficiency, a rate performance of 1460 mA h g at 2 A g, and a reversible capacity over 646 mA h g after 850 cycles was achieved. This work exemplifies the advantages of lithium-based hybrid films precisely engineered by ALD/MLD techniques for improving performances of advanced silicon anode batteries and deepens understandings on the mechanism of interfacial stability and reaction kinetics.

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http://dx.doi.org/10.1021/acsami.3c02925DOI Listing

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