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Scalable Metal Free Zinc Ion Capattery Enabled by Interstitial Defect Engineering of Nanoscale n-Type Zinc Vanadate
Sajan Raj Sasirajan Littleflower1, Saraswathi Ramakrishnan1, Desai Prashant Hanamantrao1
1Electrochemical Energy Storage and Conversion Laboratory (EESCL), Department of Chemistry, Faculty of Engineering and Technology SRM Institute of Science and Technology, Kattankulathur 603 203, Tamil Nadu, India.
Abstract:
This Letter explores the energy storage properties of nano zinc vanadate in zinc metal batteries and a Zn metal free capattery. The synthesis is a simple scalable solution state mechanochemical route with uniform nanosized one-dimensional zinc vanadate. The synthesized vanadate is engineered using NMP at the electrode fabrication stage to position the Zn2+ ions at an easily extractable site. This in turn tunes the bandgap from 2.38 to 2.16 eV, creating oxygen defective vacancies in the crystal lattice. In addition, electrochemical analysis of the engineered cathode is studied in a half-cell device that is further developed into a zinc metal free zinc ion capattery (ZiC). The developed metal free capattery delivered a capacity of 120 mAh g-1 at a current density of 100 mA g-1, and a pouch cell is fabricated to power light-emitting diodes.
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