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Lithium batteries: Improving solid-electrolyte interphases via underpotential solvent electropolymerization
DOI:10.1016/j.cplett.2016.08.045.png)
Abstract
En 中文
Understanding the mechanism of formation of solid-electrolyte interphases (SEI) is key to the prospects of lithium metal batteries (LMB). Here, we investigate via cyclic voltammetry, impedance spectroscopy and chronoamperometry the role of kinetics in controlling the properties of the SEI generated from the reduction of propylene carbonate (PC, a typical solvent in LMB). Our observations are consistent with the operation of a radical chain PC electropolymerization into polymer units whose complexity increases at lower initiation rates. As proof-of-concept, we show that slow initiation rates via one-electron PC reduction at underpotentials consistently yields compact, electronically insulating, Li+-conducting, PC impermeable SEI films. (C) 2016 The Author(s). Published by Elsevier B.V.
Keywords:
Solid electrolyte interphase
Electropolymerization
Lithium metal batteries
Dendrite inhibition
Organic carbonates
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