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Multiscalar Investigation of FeVO 4 Conversion Cathode for a Low Concentration Zn(CF 3 SO 3 ) 2 Rechargeable Zn‐Ion Aqueous Battery
Author(s) -
Kumar Sonal,
Verma Vivek,
Chua Rodney,
Ren Hao,
Kidkhunthod Pinit,
Rojviriya Catleya,
Sattayaporn Suchinda,
Groot Frank M. F.,
Manalastas William,
Srinivasan Madhavi
Publication year - 2020
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.202000018
Subject(s) - cathode , battery (electricity) , electrolyte , intercalation (chemistry) , electrochemistry , materials science , high resolution transmission electron microscopy , raman spectroscopy , aqueous solution , ion , inorganic chemistry , chemical engineering , chemistry , nanotechnology , electrode , transmission electron microscopy , power (physics) , physics , organic chemistry , quantum mechanics , engineering , optics
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 FeVO 4 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.