Modifying SiO @ C as High-performance Anode of Lithium-ion Batteries

Abstract

SiO is a widely prospected anode material, which is an excellent substitute for pure silicon for lithium-ion batteries in the future, with the reason of lower expansion degree. However, the conductivity of SiO is also poor and has a side reaction with electrolytes. Here, we choose melamine as a nitrogen source to modify the carbon layer-coated SiO materials. This study shows that nitrogen and carbon shells lead to forming stable SEI, and improve the conductivity of the anodes. Consequently, at 0.1 C, the modified SiO materials in the anode achieve an excellent specific capacity (1711.5 mAh g-1), in addition, the decay rate of the capacity is 0.6% per cycle in the next 100 cycles. This method makes a new direction for the product of SiO materials.