3 years ago

Lithium Azide as an Electrolyte Additive for All-Solid-State Lithium–Sulfur Batteries

Lithium Azide as an Electrolyte Additive for All-Solid-State Lithium–Sulfur Batteries
Heng Zhang, Gebrekidan Gebresilassie Eshetu, Michel Armand, Lide M. Rodriguez-Martinez, Oleksandr Bondarchuk, Chunmei Li, Xabier Judez
Of the various beyond-lithium-ion battery technologies, lithium–sulfur (Li–S) batteries have an appealing theoretical energy density and are being intensely investigated as next-generation rechargeable lithium-metal batteries. However, the stability of the lithium-metal (Li°) anode is among the most urgent challenges that need to be addressed to ensure the long-term stability of Li–S batteries. Herein, we report lithium azide (LiN3) as a novel electrolyte additive for all-solid-state Li–S batteries (ASSLSBs). It results in the formation of a thin, compact and highly conductive passivation layer on the Li° anode, thereby avoiding dendrite formation, and polysulfide shuttling. It greatly enhances the cycling performance, Coulombic and energy efficiencies of ASSLSBs, outperforming the state-of-the-art additive lithium nitrate (LiNO3). The bright azide of life: Lithium azide effectively favors the formation of dendrite-free and highly ionic conductive solid electrolyte interphase on Li electrodes, and thereby improves the cycling performances and sulfur utilization of Li–S cells.

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

DOI: 10.1002/anie.201709305

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