Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 17, Pages 21127-21131Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.08.152
Keywords
Na-ion batteries; Zn substitution; Electrochemical performance
Categories
Funding
- SERB-DST [Early Career Research (ECR) Award] [ECR/2015/000159]
- BRNS (DAE Young Scientist Research Award) [34/20/12/2015/BRNS]
- IIT Delhi (FIRP project) [MI01418]
- SERB-DST (NPDF) [PDF/2016/003565]
- DST-inspire
- IIT Delhi
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We report the synthesis, physical properties and electrochemical performance of Zn substituted Na0.44Mn1-xZnxO2 (x= 0 - 0.02) nanostructures as cathode in Na-ion batteries for energy storage applications. These samples stabilize in the orthorhombic structure and the morphology is found to be slab like with 100 200 nm width and few micrometer of length. The resistivity measurements show highly insulating nature for all the samples, where the activation energy decreases with increasing Zn concentration indicating more defect levels in the band gap. The cyclic voltammogram (CV) shows reversible oxidation and reduction peaks, which clearly shift towards higher/lower potentials with increasing Zn concentration up to 2%. We observed the specific capacity of about 100 mAh/g at current density of 4 mA/g and improved cycle life for Zn substituted x = 0.005 sample. However, with further increasing the Zn concentration (x = 0.02), the specific capacity decreases, which can be a manifestation of the decreased number of reduction peaks in the CV data.
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