4 years ago

High Polarity Poly(vinylidene difluoride) Thin Coating for Dendrite-Free and High-Performance Lithium Metal Anodes

High Polarity Poly(vinylidene difluoride) Thin Coating for Dendrite-Free and High-Performance Lithium Metal Anodes
Nae-Lih Wu, Jing Luo, Chia-Chen Fang
The high-polarity β-phase poly(vinylidene difluoride) (β-PVDF), which has all trans conformation with F and H atoms located on the opposite sides of the polymer backbone, is demonstrated to be a promising artificial solid-electrolyte interphase coating on both Cu and Li metal anodes for dendrite-free Li deposition/stripping and enhanced cycling performance. A thin (≈4 µm) β-PVDF coating on Cu enables uniform Li deposition/stripping at high current densities up to 5 mA cm−2, Li-plating capacity loadings of up to 4 mAh cm−2, and excellent cycling stability over hundreds of cycles under practical conditions (1 mA cm−2 with 2 mAh cm−2). Full cells containing an LiFePO4 cathode and an anode of either β-PVDF coated Cu or Li also exhibit excellent cycling stability. The profound effects of the high-polarity PVDF coating on dendrite suppression are attributed to the electronegative F-rich interface that favors layer-by-layer Li deposition. This study offers a new strategy for the development of dendrite-free metal anode technology. Li metal anodes with a thin β-phase poly(vinylidene difluoride) coating demonstrate dendrite-free Li deposition and enhanced cycling performance at practical current densities and capacity loadings. The high chemical polarity of the polymer with its preferentially sided F alignment provides a new strategy for optimizing the interfacial interactions that favor layer-by-layer Li deposition.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201701482

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