High cycling performance Si/CNTs@C composite material prepared by spray–drying method

The anode material Si/CNTs@C composite is prepared by a spray–drying combined pyrolysis technology. The as–prepared material is characterized by XRD, SEM, TEM, and electrochemical measurements. The composite is composed of nano–Si, CNTs, flake graphite, and amorphous glucose–pyrolyzed carbon, and CNTs provides a good wrapping effect to buffer the volume change of silicon. The composite as anode for LIB shows good electrochemical performance. In the voltage range of 2.00–0.01 V, it delivers initial charge capacity of 630.5 at 100 mA g−1, and 85.14 % of initial capacity is retained even after 50 cycles. The CV and AC impedance analysis indicate that the prepared composite separately shows good electrode stability and low charge- transfer impedance Rct. The results indicate that the Si/CNTs@C composite is a potential alternative to graphite for high energy–density lithium–ion batteries.