Abstract:
The dimethylformamide (DMF) solution containing SnCl
2, polyacrylonitrile (PAN) and poly(methyl methacrylate) (PMMA) was coated on the surface of Cu foils by simple knife coating, and then calcined in vacuum. The SnO
2-C composite coating with three dimensional network structure was fabricated successfully. The micro-structure of the composite coating was characterized and the performance of network structure SnO
2-C composite coating as lithium ion batteries anode was tested. The results show that the coating presented the continuous network structure formed by interconnected carbon based branches with width of 0.1-1
μm which consisted of amorphous carbon matrix, SnO
2 nano-particles with size of 10-150 nm and micro-pores with size of 1-5 nm. When the composite coating was employed as anodes of lithium ion batteries, after 100 times cycling under current density of 50 mA·g
-1, the composite coating electrodes exhibited specific capacity of 642 mAh·g
-1 without capacity fading during the cycling. The specific capacity of the electrodes under current density of 10 A·g
-1 was 43% of the specific capacity under current density of 50 mA·g
-1. The composite coating had the good electrochemical performance.