Mechanism of the Loss of Capacity of LiNiO2 Electrodes for Use in Aqueous Li-Ion Batteries: Unveiling a Fundamental Cause of Deterioration in an Aqueous Electrolyte through In Situ Raman Observation
In: ACS Applied Materials & Interfaces, Jg. 12 (2020-12-01), S. 56076-56085
Online
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Zugriff:
This study investigated the fundamental mechanisms of the loss of capacity of LiNiO2 (LNO) electrodes for Li+ insertion/deinsertion with a special focus on the origin of this deterioration in an aqueous system. In situ Raman spectra revealed that the intercalation of H+ ions formed a NiOOHx film at the surface of LNO during the initial electrochemical cycles; this NiOOHx film was also confirmed by X-ray photoelectron spectroscopy and transmission electron microscopy analysis. The formation of an electrochemically inactive spinel-like phase (Ni3O4) at the subsurface was triggered by the absence of Li in the NiOOHx film at the surface. These structural changes of LNO, accelerated by the intercalation of H+ ions, were considered to be the fundamental cause of the greater loss of capacity in the aqueous system.
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Mechanism of the Loss of Capacity of LiNiO2 Electrodes for Use in Aqueous Li-Ion Batteries: Unveiling a Fundamental Cause of Deterioration in an Aqueous Electrolyte through In Situ Raman Observation
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Autor/in / Beteiligte Person: | Miyazaki, Kohei ; Yokoyama, Yuko ; Miyahara, Yuto ; Abe, Takeshi ; Kondo, Yasuyuki ; Lee, Changhee |
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Zeitschrift: | ACS Applied Materials & Interfaces, Jg. 12 (2020-12-01), S. 56076-56085 |
Veröffentlichung: | American Chemical Society (ACS), 2020 |
Medientyp: | unknown |
ISSN: | 1944-8252 (print) ; 1944-8244 (print) |
DOI: | 10.1021/acsami.0c18157 |
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