Stabilizing the Solid-Electrolyte Interphase with Polyacrylamide for High-Voltage Aqueous Lithium-Ion Batteries.

ABSTRACT: The introduction of "water-in-salt" electrolyte (WiSE) concept opens a new horizon to aqueous electrochemistry that is benefited from the formation of a solid-electrolyte interphase (SEI). However, such SEI still faces multiple challenges, including dissolution, mechanical damaging, and incessant reforming, which result in poor cycling stability. Here, we report a polymeric additive, polyacrylamide (PAM) that effectively stabilizes the interphase in WiSE. With the addition of 5 molar % PAM to 21 mol kg^-1 LiTFSI electrolyte, a LiMn₂ O₄ ∥L-TiO₂ full cell exhibits enhanced cycling stability with 86 % capacity retention after 100 cycles at 1 C. The formation mechanism and evolution of PAM-assisted SEI was investigated using operando small angle neutr

SUBMITTER: Hou X 

PROVIDER: S-EPMC8518740 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature