Lithium-metal polysulfide batteries with free-standing MoSxCy thin-film cathodes

Date

2021

Authors

Tan, Xin
Tanwar, Khagesh
Rahman, Md Mokhlesur
Mateti, Srikanth
Cizek, Pavel
Koley, Paramita
Hou, Chunping
Smith, Sean
Chen, Ying

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Abstract

Free-standing thin film electrodes hold huge promise for solid-state and micro batteries required by a range of portable electronic devices. However, for lithium-sulfur (Li–S) and lithium-metal polysulfide (Li-MSx; M = Mo, V, Ti, etc.) batteries, the promising thin film electrodes are not possible yet because of low melting point of sulfur. Here, for the first time, we have developed amorphous molybdenum sulfide (MoSx) – carbon (Cy) composite thin-films using a magnetron sputtering method with novel co-deposition of molybdenum metal and sulfur-carbon composite. The thin films were used as the free-standing cathode for Li-MSx cells that demonstrates excellent cycling performance and rate capability without any shuttle effect. The Li-MoSx cells exhibit a high areal-capacity of 115 μAh/cm2 at the current density of 20 μA/cm2, an excellent stability of 500 cycles and remarkable rate capability with no traces of shuttle effect. Density functional theory (DFT)-Molecular dynamics (MD) based calculations reveal the insertion of lithium via an optimal mix of conversion and intercalation reactions without breaking the base Mo-Sx structure, eliminating the shuttle effect, and producing stable cycling performance.

Description

Keywords

Battery, Lithium sulfur battery, Sputtering deposition, Metal polysulfide, Thin film cathode, Simulation

Citation

Source

Journal of Power Sources

Type

Journal article

Book Title

Entity type

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DOI

10.1016/j.jpowsour.2021.230445

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