EDTA-Fe(III) sodium complex-derived bubble-like nitrogen-enriched highly graphitic carbon nanospheres as anodes with high specific capacity for lithium-ion batteries

Bubble-like nitrogen-enriched graphitic carbon was prepared using EDTA-Fe(III) sodium complex (ethylenediaminetetraacetic acid ferric sodium salt) as the precursor. The complex was carbonized at 700 degrees C for 2 h in argon atmosphere, and then, the product was washed with diluted hydrochloric acid and distilled water to remove iron and iron compounds so as to achieve the hollow carbon nanospheres. The as-prepared bubble-like carbon material exhibits excellent energy storage capability as the anode for lithium-ion batteries. A maximal reversible specific capacity of about 505 mAh g(-1) can be achieved at a current density of 100 mA g(-1), and 150 mAh g(-1) can still be retained at a high current density of 1600 mA g(-1), demonstrating superior cycling performance and excellent rate capability mainly due to the unique porous architecture and improved conductivity.