Preparation and properties of hierarchical porous graphitization carbon anode

A series of hierarchical porous graphitization carbon (HPGC) anode materials were synthesized for super lithium ion capacitor (SLIC) using phenolic resin as carbon precursor through physical activation-templating combined methods between 500-900°C. The structure of HPGC was investigated by SEM, TEM and nitrogen adsorption. The electric double layer capacitor and half-cell were fabricated to investigate the electrochemical performances of HPGC anode materials by charge-discharge of constant current and potential-sweep cyclic voltammetry. The results show that the macro-meso-microporous pore-size distribution and graphite microcrystalline structure of HPGC. The HPGC anodes exhibit good performance in both LiPF ₆/EC+DMC and Et ₄NBF ₄/AN electrolyte. The carbon material obtained at 600°C (HPGC-600) has the optimal electrochemical performance. The reversible charge capacity reaches 611.2 mA·h/g (0.2 C), and the rate of capacity retention is 74% after 50 cycles. The reversible capacity at 6 C is 225 mA·h/g. The capacitance of HPGC in capacitor reaches 143 F/g (0.1 A/g), and the rate performance is good.