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Solubility-mediated sustained release enabling nitrate additive in carbonate electrolytes for stable lithium metal anode
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Solubility-mediated sustained release enabling nitrate additive in carbonate electrolytes for stable lithium metal anode
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Journal Article
Solubility-mediated sustained release enabling nitrate additive in carbonate electrolytes for stable lithium metal anode
2018
Overview
The physiochemical properties of the solid-electrolyte interphase, primarily governed by electrolyte composition, have a profound impact on the electrochemical cycling of metallic lithium. Herein, we discover that the effect of nitrate anions on regulating lithium deposition previously known in ether-based electrolytes can be extended to carbonate-based systems, which dramatically alters the nuclei from dendritic to spherical, albeit extremely limited solubility. This is attributed to the preferential reduction of nitrate during solid-electrolyte interphase formation, and the mechanisms behind which are investigated based on the structure, ion-transport properties, and charge transfer kinetics of the modified interfacial environment. To overcome the solubility barrier, a solubility-mediated sustained-release methodology is introduced, in which nitrate nanoparticles are encapsulated in porous polymer gel and can be steadily dissolved during battery operation to maintain a high concentration at the electroplating front. As such, effective dendrite suppression and remarkably enhanced cycling stability are achieved in corrosive carbonate electrolytes.
The solid-electrolyte interphase (SEI) is one of the governing factors for the reversibility of Li metal anode. Here, the authors reveal the impact of nitrate additive on the SEI in carbonate electrolytes, and demonstrate a method to overcome the solubility limitation of nitrate.
