首页|Operando FTIR study on water additive in lithium-sulfur batteries to mitigate shuttle effect

Operando FTIR study on water additive in lithium-sulfur batteries to mitigate shuttle effect

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Additives in the electrolytes of Li-S batteries aim to increase overall capacity,improve Li+ion conductiv-ity,enhance cyclability,and mitigate the shuttle effect,which is one of the major issues of this system.Here,the use of water as an additive in the commonly used electrolyte,1.0 M LiTFSI/1.0％(w/w)LiN03 and a 1∶1 mixture of 1,3-dioxolane(DOL)and 1,2-dimethoxyethane(DME)was investigated.We used C02Mn0.5Al0.5O4(CMA)as an electrocatalyst anchored on an activated carbon(AC)electrode with added sulfur via a melt-diffusion process.The structural analysis of CMA via Rietveld refinement showed inter-atomic spaces that can promote ionic conductivity,facilitating Li+ion migration.Electrochemical tests determined 1600 ppm as the optimal water concentration,significantly reducing the shuttle effect.Post-mortem XPS analysis focused on the lithium metal anode revealed the formation of Li2O layers in dry samples and LiOH in wet samples.Better capacity was observed in wet samples,which can be attrib-uted to the superior ionic conductivity of LiOH at the electrode/electrolyte interface,surpassing that of Li2O by 12 times.Finally,Operando FTIR experiments provided real-time insights into electrolyte degra-dation and SEI formation,elucidating the activity mechanisms of water and Li2CO3 over the cycles.This work presents results that could aid future advancements in Li-S battery technology,offering possibilities to mitigate its challenges with inexpensive and scalable additives.

DiffusionLi-SIonic conductivityOperando FTIR

Érick A.Santos、Martim C.Policano、Manuel J.Pinzón、Isabela Galantini、Vanessa A.Gonçalves、Francisco C.B.Maia、Lucyano J.A.Macedo、Gustavo Doubek、Renato G.Freitas、Hudson Zanin

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Advanced Energy Storage Division,Center for Innovation on New Energies,School of Electrical and Computer Engineering,University of Campinas,Av Albert Einstein 400,Campinas,SP 13083-852,Brazil

Brazilian Synchrotron Light Laboratory,Brazilian Center for Research in Energy and Materials,Campinas 13083-970,SP,Brazil

Catalytic Processes and Materials Group,Department of Chemical Engineering,Faculty of Science and Technology,MESA+Institute for Nanotechnology,University of Twente,PO Box 217,7500 AE Enschede,The Netherlands

Centre for Cooperative Research on Alternative Energies(CIC EnergiGUNE),Basque Research and Technology Alliance(BRTA),Vitoria-Gasteiz 01510,Spain

Institute of Physics & Institute of Chemistry,Laboratory of Computational Materials,Federal University of Mato Grosso,Cuiaba 78060-900,MT,Brazil

Advanced Energy Storage Division,LAB,Center for Innovation on New Energies,School of Chemical Engineering,University of Campinas,Av Albert Einstein 500,Campinas 13083-852,SP,Brazil

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2024

10.1016/j.jechem.2024.06.060

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.98(11)