Journal
CHEMISTRY OF MATERIALS
Volume 33, Issue 24, Pages 9546-9559Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c02680
Keywords
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Funding
- China Scholarship Council (CSC)
- Karlsruhe Nano Micro Facility (KNMF)
- Helmholtz Research Infrastructure at Karlsruhe Institute of Technology (KIT)
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In this study, in situ Li-7 and ex situ Li-6 nuclear magnetic resonance (NMR) spectroscopy were used to monitor lithium mobility in a LiNiO2 cathode during Li-ion (de)intercalation. Additionally, in situ X-ray absorption spectroscopy and galvanostatic intermittent titration were employed to capture changes during the deintercalation process. The findings suggest that Jahn-Teller distortion hinders lithium diffusion and coupled motions of electrons and Li ions were discovered for the first time.
In situ Li-7 and ex situ Li-6 nuclear magnetic resonance (NMR) spectroscopy is applied to monitor lithium mobility in a LiNiO2 cathode during Li-ion (de)intercalation. In situ X-ray absorption spectroscopy and galvanostatic intermittent titration are also used to capture changes during the Li-ion deintercalation process. A considerable line broadening was first found by Li-7 NMR spectroscopy. The Jahn-Teller distortion hinders the Li diffusion, thus broadening the NMR signal. The observed NMR shifts are compared to Li/vacancy ordering patterns described earlier by Arroyo y de Dompablo et al. Coupled motions of electrons and Li ions are also discovered by both in situ Li-7 and ex situ Li-6 NMR spectroscopy for the first time. They result in local Li environments with an enhanced number of Ni3+ neighbors at highly charged states. This opens a new perspective for understanding the highly delithiated structure.
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