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

Dutta, Prasit Kumar, Myung, Yoon, Venkiteswaran, Rohini Kulangaramadom, Mehdi, Layla ORCID: 0000-0002-8281-9524, Browning, Nigel ORCID: 0000-0003-0491-251X, 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.

Text
MS-ACS-Rev.docx - Author Accepted Manuscript
Download (51MB)

Official URL: http://dx.doi.org/10.1021/acs.jpcc.9b01807

Abstract

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
Depositing User:	Symplectic Admin
Date Deposited:	13 Jun 2019 12:15
Last Modified:	19 Jan 2023 00:40
DOI:	10.1021/acs.jpcc.9b01807
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3045681