TY  - JOUR
AU  - Li, Jie
AU  - Hou, Xu
AU  - Wang, Rui
AU  - He, Xin
AU  - Pollard, Travis P
AU  - Ju, Xiaokang
AU  - Du, Leilei
AU  - Paillard, Elie
AU  - Frielinghaus, Henrich
AU  - Barnsley, Lester C.
AU  - Borodin, Oleg
AU  - Xu, Kang
AU  - Winter, Martin
TI  - Stabilizing the solid‐electrolyte interphase with polyacrylamide for high‐voltage aqueous lithium‐ion batteries
JO  - Angewandte Chemie / International edition
VL  - 60
IS  - 42
SN  - 1521-3773
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2021-03289
SP  - 22812-22817
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:34379346
UR  - <Go to ISI:>//WOS:000695022900001
DO  - DOI:10.1002/anie.202107252
UR  - https://juser.fz-juelich.de/record/894582
ER  -