%0 Journal Article
%A Li, Jie
%A Hou, Xu
%A Wang, Rui
%A He, Xin
%A Pollard, Travis P
%A Ju, Xiaokang
%A Du, Leilei
%A Paillard, Elie
%A Frielinghaus, Henrich
%A Barnsley, Lester C.
%A Borodin, Oleg
%A Xu, Kang
%A Winter, Martin
%T Stabilizing the solid‐electrolyte interphase with polyacrylamide for high‐voltage aqueous lithium‐ion batteries
%J Angewandte Chemie / International edition
%V 60
%N 42
%@ 1521-3773
%C Weinheim
%I Wiley-VCH
%M FZJ-2021-03289
%P 22812-22817
%D 2021
%X 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 LiMn2O4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 neutron scattering and density functional theory (DFT) calculations, which reveal that PAM minimizes the presence of free water molecules at the anode/electrolyte interface, accelerates the TFSI- anion decomposition, and densifies the SEI.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:34379346
%U <Go to ISI:>//WOS:000695022900001
%R 10.1002/anie.202107252
%U https://juser.fz-juelich.de/record/894582