Preparation of Hard Carbon Derived from Jackfruit Seeds and Its Mechanism of Sodium Storage
Biomass-derived hard carbon owning to the low synthesis cost has attracted wide attention for anode materials of sodium-ion batteries.Herein we propose a high specific capacity hard carbon by the one-step carbonization method using the jackfruit kernels with low-cost as precursors under different sintering temperatures and conduct in-depth research on the correlation electrochemical performance.The results show that the hard carbon carbonized at 1300℃delivers a high reversible specific capacity of 334 mAh/g at a current density of 25 mA/g with a Coulombic efficiency of 71.4%and keeps a specific capacity of 303.8 mAh/g with a capacity retention of 90.2%at the same current density after 100 cycles.The mechanism of sodium storage is investigated by galvanostatic intermittent titration technique(GITT)and non-situ XRD.The results show that the mechanism of sodium storage satisfies the adsorption-intercalation model.Such hard carbon with promising electrochemical properties provides the chance to develop inexpensive sodium anode materials.
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