The lamella SnSbCux/MCMB/carbon composite as high stability and durable anodes for lithium ion battery

Abstract

Lamella SnSbCux/MCMB/carbon composite were prepared by a multi-step synthesis method for high stability and long life lithium ion battery electrodes. The lamella composite were synthesized via co-precipitation method combining with high-speed ball milling and subsequent pyrolysis. The resultant composite are consisted of nano SnSbCux particles, lamella mesophase carbon microbeads (MCMB, after ball milling) and amorphous carbon coating pyrolyzed from phenolic resin. The lamella MCMB was treated as the inner terrace, which offered efficient electron conducting pathway for connection of nano SnSbCux particle and pyrolysis carbon. With the increasing of the content of inactive element Cu, the SnSbCux/MCMB/carbon composite are propitious to improve the cycling performance. When cycled at a constant current of 100mAg−1 between 0.01 and 2.0V, the coulombic efficiency of first cycle exceeds 88.45% and the reversible capacity of 100th cycle attains to 485mAhg−1 (91.4% capacity retention) in SnSbCu0.5/MCMB/carbon alloy anodes.