Improving Cycling Stability of the Lithium Anode by a Spin-Coated High-Purity Li(3)PS(4) Artificial SEI Layer
Résumé
Controlling the composition and microstructure of the solid electrolyte interphase (SEI) layer is critical to improving the cycling stability of the high-energy-density lithium-metal electrode. It is a quite tricky task to control the properties of the SEI layer which is conventionally formed by the chemical reactions between a Li metal and the additives. Herein, we develop a new route to synthesize a lithium-compatible sol of the sulfide electrolyte Li(3)PS(4), so that a Li(3)PS(4) artificial SEI layer with a controllable nanoscale thickness and high phase purity can be prepared by spin-coating. The layer stabilizes the lithium/electrolyte interface by homogenizing the Li-ion flux, preventing the parasitic reactions, and alleviating concentration polarization. Consequently, a symmetrical cell with the Li(3)PS(4)-modified lithium electrodes can achieve stable lithium plating/stripping for 800 h at a current density of 1 mA cm(-2). The Li-S batteries assembled with the Li(3)PS(4)-protected Li anodes show better capacity retention than their bare Li counterparts, whose average decay rate from the 240th cycle to the 800th cycle is only 0.004%/cycle. In addition, the Li(3)PS(4) layer improves the rate capacity of the batteries, significantly enhancing the capacity from 175 to 682 mA h g(-1) at a 2 C rate. The spin-coated Li(3)PS(4) artificial SEI layer provides a new strategy to develop high-performance Li metal batteries.
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Improving cycling stability of lithium anode by spin-coated high-purity Li3PS4 artificial SEI layer.pdf (1.24 Mo)
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Improving cycling stability of lithium anode by spin-coated high-purity Li3PS4 artificial SEI layer-SI.pdf (2.9 Mo)
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