ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces
5 years ago

Suppressing Lithium Dendrite Growth with a Single-Component Coating

Suppressing Lithium Dendrite Growth with a Single-Component Coating
Xing Xing, Hongyao Zhou, Haodong Liu, Matthew Gonzalez, Byoung-Sun Lee, Ping Liu
A single-component coating was formed on lithium (Li) metal in a lithium iodide/organic carbonate [dimethyl carbonate (DMC) and ethylene carbonate (EC)] electrolyte. LiI chemically reacts with DMC to form lithium methyl carbonate (LMC), which precipitates and forms the chemically homogeneous coating layer on the Li surface. This coating layer is shown to enable dendrite-free Li cycling in a symmetric Li∥Li cell even at a current density of 3 mA cm–2. Adding EC to DMC modulates the formation of LMC, resulting in a stable coating layer that is essential for long-term Li cycling stability. Furthermore, the coating can enable dendrite-free cycling after being transferred to common LiPF6/carbonate electrolytes, which are compatible with metal oxide cathodes.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b08198

DOI: 10.1021/acsami.7b08198

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