Tubular polypyrrole with chloride ion dopants as an ultrafast organic anode for high power lithium ion batteries

Polypyrrole (PPy) as a representative p-type conductive polymer attracts wide attention as energy storage materials. However, the sluggish reaction kinetics and the low specific capacity impede its application in high power lithium ion batteries (LIBs). Herein, tubular PPy with chloride and MO anion dopants is synthesized and investigated as anode in LIBs. The Cl- and MO anion dopants can increase the ordered aggregation and the conjugation length of pyrrolic chains, forming plentiful conductive domains and affecting the conduction channel inside the pyrrolic matrix, therefore achieving fast charge transfer and Li+ ion diffusion, low ion transfer energy barrier and rapid reaction kinetics. On account of the above synergistic effect, PPy electrodes delivers an ultrahigh specific capacity of 2067.8mAh g-1 at 200 mA g-1 and a remarkable rate capacity of 1026 mAh g-1at 10 A g-1, realizing the high energy density (724 Wh kg-1) and power density (7237 W kg-1) simultaneously.