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Insights into the Plateau Capacity Dependence on the Rate Performance and Cycling Stability of a Superior Hard Carbon Microsphere Anode for Sodium-Ion Batteries

ACS Applied Energy Materials (IF 6.024 ) Publication Date: September 8, 2020 DOI: https://doi.org/10.1021/acsaem.0c01750 Author(s): Nagmani (IIT Kharagpur); Sreeraj Puravankara (IIT Kharagpur) The sodium-ion storage mechanism of the hard carbon microspheres (HCMSs) synthesized using the microwave technique from the sucrose precursor and a 50% DEG/H 2 O solvent mixture carbonized at 1000 °C (50DEG-HCMS) is studied. The superior sodium-ion battery (SIB) anode, 50DEG-HCMS delivers the highest reversible capacities of 385 (ICE ∼75.5%) and 265 mAh g –1 (ICE ∼72%) at current densities of 30 and 300 mA g –1 , respectively. The plateau related capacity (PRC) solely determines the reversible capacity fade on cycling at all C-rates for the HCMS, validating the insertion/pore-filling mechanism for the low voltage (< ∼0.1 V) capacity. In this study, we substantiate that maximizing PRC may not be the best strategy in designing a high rate, a highly cyclable carbon-based anode for SIBs. HCMS

Academic Profile of Nagmani

Energy Storage @ School of Energy Science and Engineering, IIT Kharagpur

Alkali-ion batteries: More information: coming soon...

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