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000894582 1001_ $$0P:(DE-Juel1)174577$$aLi, Jie$$b0
000894582 245__ $$aStabilizing the solid‐electrolyte interphase with polyacrylamide for high‐voltage aqueous lithium‐ion batteries
000894582 260__ $$aWeinheim$$bWiley-VCH$$c2021
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000894582 520__ $$aThe 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.
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000894582 65017 $$0V:(DE-MLZ)GC-1603-2016$$2V:(DE-HGF)$$aChemical Reactions and Advanced Materials$$x0
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000894582 7001_ $$0P:(DE-Juel1)173731$$aHou, Xu$$b1
000894582 7001_ $$0P:(DE-Juel1)161485$$aWang, Rui$$b2
000894582 7001_ $$0P:(DE-Juel1)169319$$aHe, Xin$$b3$$eCorresponding author
000894582 7001_ $$0P:(DE-HGF)0$$aPollard, Travis P$$b4
000894582 7001_ $$0P:(DE-Juel1)176763$$aJu, Xiaokang$$b5
000894582 7001_ $$0P:(DE-HGF)0$$aDu, Leilei$$b6
000894582 7001_ $$0P:(DE-Juel1)166311$$aPaillard, Elie$$b7
000894582 7001_ $$0P:(DE-Juel1)130646$$aFrielinghaus, Henrich$$b8
000894582 7001_ $$0P:(DE-Juel1)172014$$aBarnsley, Lester C.$$b9
000894582 7001_ $$0P:(DE-HGF)0$$aBorodin, Oleg$$b10
000894582 7001_ $$0P:(DE-HGF)0$$aXu, Kang$$b11
000894582 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b12
000894582 773__ $$0PERI:(DE-600)2011836-3$$a10.1002/anie.202107252$$gp. anie.202107252$$n42$$p22812-22817$$tAngewandte Chemie / International edition$$v60$$x1521-3773$$y2021
000894582 8564_ $$uhttps://juser.fz-juelich.de/record/894582/files/Angew%20chemie_Manuscript_WiSE-PAM-20210727.pdf$$yOpenAccess
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