Electrochemical lithium storage of C/Co composite as an anode material for lithium ion batteries

A novel C/Co composite with Co nanoparticles embedded in carbon matrix is synthesized firstly by pyrolysis of polymeric cobalt phthalocyanine (PcCo) at 700 °C in argon atmosphere. This composite is investigated as an anode material for lithium ion batteries, indicating high tap density and excellent electrochemical performance. The C/Co electrode can retain a higher reversible capacity of over 600 mAh g− 1 at a current of 50 mA g− 1 after 40 cycles and shows better rate capability and less hysteresis in comparison to carbon not containing Co. The significant improvement is attributed to the Co nanoparticles grown in-situ reaction with catalytic activity and high electrical conductivity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A novel C/Co composite with high tap density is synthesized firstly by pyrolysis of polymeric phthalocyanine cobalt. ► Co nanoparticles grown by in-situ reaction are embedded in carbon matrix homogeneously. ► The C/Co composite shows reduced hysteresis, high capacity and good rate capability as anode of lithium ion battery. ► Co nanoparticles enhance electric conductivity and catalyze the reaction of C/Co electrode effectively.