Performance of phenolic resin-based hard carbon anode material
The limited theoretical capacity and rate capability of graphite anode limit the development of Li-ion battery.The preparation of hard carbon anode material can improve the theoretical capacity.Phenolic resin hard carbon with resorcinol and formaldehyde as precursors and ammonia as catalyst is presented with hydrothermal approach.SEM,high-resolution transmission electron microscopy(TEM),XRD and N2 adsorption-desorption are adopted to characterize the surface morphology and structural features of the materials,the electrochemical performance of the button cell with lithium metal as counter electrode is tested.The hard carbon sample exhibits typical double-layer capacitance and reversibility of charge and discharge.When the electrode is cycled in 0.01-3.00 V at a current of 50 mA/g,the initial specific discharge capacity is 311.22 mAh/g and the initial Coulombic efficiency is 60.07%,the specific capacity retention rate is 75.7%after 50 cycles.After cycling at different currents,it can basically return to the capacity before the current change,which presents good cycle stability and rate capacity.
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