首页|Postmortem 7Li NMR analysis for assessing the reversibility of lithium metal electrodes in lithium metal batteries

Postmortem 7Li NMR analysis for assessing the reversibility of lithium metal electrodes in lithium metal batteries

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Despite the proficiency of lithium(Li)-7 NMR spectroscopy in delineating the physical and chemical states of Li metal electrodes,challenges in specimen preparation and interpretation impede its progress.In this study,we conducted a comprehensive postmortem analysis utilizing 7Li NMR,employing a stan-dard magic angle spinning probe to examine protective-layer coated Li metal electrodes and LiAg alloy electrodes against bare Li metal electrodes within Li metal batteries(LMBs).Our investigation explores the effects of sample burrs,alignment with the magnetic field,the existence of liquid electrolytes,and precycling on the 7Li NMR signals.Through contrasting NMR spectra before and after cycling,we identi-fied alterations in Li0 and Li+signals attributable to the degradation of the Li metal electrode.Our NMR analyses decisively demonstrate the efficacy of the protective layer in mitigating dendrite and solid elec-trolyte interphase formation.Moreover,we noted that Li+ions near the Li metal surface exhibit magnetic susceptibility anisotropy,revealing a novel approach to studying diamagnetic species on Li metal elec-trodes in LMBs.This study provides valuable insights and practical guidelines for characterizing distinct lithium states within LMBs.

NMR spectroscopyLithium-7Lithium metal batteryElectrolyteElectrode-protective layerSolid electrolyte interfaceMagnetic susceptibility anisotropyLithium-metal NMR signalDiamagnetic 7Li NMR signal

Jaewon Baek、Sunha Kim、Hee-Tak Kim、Oc Hee Han

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Department of Chemical & Biomolecular Engineering,KA1ST,Daejeon 34141,Republic of Korea

Metropolitan Seoul Center,Korea Basic Science Institute,Seoul 03759,Republic of Korea

Graduate School of Analytical Science & Technology,Chungnam National University,Daejeon 34134,Republic of Korea

Basic Research Project of the Korea Basic Science Institute(KBSI)funded by the Korea Ministry of Science and ICT(MSIT)Basic Research Project of the Korea Basic Science Institute(KBSI)funded by the Korea Ministry of Science and ICT(MSIT)Basic Research Project of the Korea Basic Science Institute(KBSI)funded by the Korea Ministry of Science and ICT(MSIT)Basic Research Project of the Korea Basic Science Institute(KBSI)funded by the Korea Ministry of Science and ICT(MSIT)Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea(NRF)funded by MSIT

C123000C210200C310200C421000NRF-2021M1A2A2038141

2024

10.1016/j.jechem.2024.02.063

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)：2024.94(7)