Mechanism of Na-Ion Storage in BiOCl Anode and the Sodium-Ion Battery Formation

Dutta, Prasit Kumar, Myung, Yoon, Venkiteswaran, Rohini Kulangaramadom, Mehdi, Layla, Browning, Nigel, Banerjee, Parag and Mitra, Sagar
(2019) Mechanism of Na-Ion Storage in BiOCl Anode and the Sodium-Ion Battery Formation. JOURNAL OF PHYSICAL CHEMISTRY C, 123 (18). pp. 11500-11507.

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We systematically unravel the mechanism by which sodium ion reacts electrochemically with ionically layered BiOCl nanosheets. Solution-processed BiOCl nanosheets were cycled using slow scan cyclic voltammetry (50 μV s-1) to reach the desired reaction voltages. Characterizations using in situ impedance spectroscopy and ex situ X-ray diffraction, Raman spectroscopy, and transmission electron microscopy are used to map the mechanism of Na-ion insertion and deinsertion in BiOCl nanosheets. It was found that BiOCl initially undergoes a conversion reaction to form metallic Bi. The metallic Bi further alloys with sodium ion to form Na3Bi and NaBi, a compound whose formation has not been reported before. We also detect the formation of BiO, Na3BiO4, and NaBiO3. Finally, BiOCl is used as anode against a Prussian blue cathode to prepare a full cell that is capable of providing an average discharge potential of ∼2.2 V at the 100th cycle. The overall study reveals new insights and key differences in the mechanism of sodium-based electrochemical energy storage systems.

Item Type: Article
Uncontrolled Keywords: 40 Engineering, 4016 Materials Engineering, 34 Chemical Sciences, 3406 Physical Chemistry, 7 Affordable and Clean Energy
Depositing User: Symplectic Admin
Date Deposited: 13 Jun 2019 12:15
Last Modified: 21 Jun 2024 08:49
DOI: 10.1021/acs.jpcc.9b01807
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