Multiscalar Investigation of FeVO4 Conversion Cathode for a Low Concentration Zn(CF3SO3)2 Rechargeable Zn-Ion Aqueous Battery
Publication date
2020-07-01
Authors
Kumar, Sonal
Verma, Vivek
Chua, Rodney
Ren, Hao
Kidkhunthod, Pinit
Rojviriya, Catleya
Sattayaporn, Suchinda
De Groot, F.
Manalastas, William
Srinivasan, Madhavi
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Advisors
Supervisors
Document Type
Article
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taverne
Abstract
Battery cathode materials operating on multivalent-ion intercalation are prone to short operational lifetimes, traditionally explained to be due to poor solid-state diffusion. Here, we overcome this problem by using a conversion-type cathode material and demonstrate the benefits in a FeVO4 host structure. The rechargeable Zn-ion battery exhibits stability for an unprecedented operational lifetime of 57 days with a high capacity of 272 mAh g−1 (60 mA g−1) over 140 cycles. We use a combination of synchrotron-based XAS, SRXTM, Raman, XRD and HRTEM techniques to elucidate the cathode material evolution at multilength-scale for understanding the Zn-ion storage mechanism. We further highlight the benefits of using a low-salt concentration electrolyte and pH-consideration analysis in aqueous battery development, the optimization of which leads to a 4-fold increase in battery performance as compared to conventional high-salt concentration electrolyte formulations.
Keywords
aqueous zinc-ion battery, conversion mechanism, electrolyte pH, tomography, x-ray absorption spectroscopy, Taverne, Energy Engineering and Power Technology, Electrical and Electronic Engineering, Electrochemistry
Citation
Kumar, S, Verma, V, Chua, R, Ren, H, Kidkhunthod, P, Rojviriya, C, Sattayaporn, S, de Groot, F M F, Manalastas, W & Srinivasan, M 2020, 'Multiscalar Investigation of FeVO 4 Conversion Cathode for a Low Concentration Zn(CF 3 SO 3 ) 2 Rechargeable Zn-Ion Aqueous Battery', Batteries and Supercaps, vol. 3, no. 7, pp. 619-630. https://doi.org/10.1002/batt.202000018