Robust nano-Si@C as high-performance lithium-ion battery anode
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Abstract:
Using chemical vapor deposition method, a nano-Si@C composite with a core-shell structure was obtained by robust thin carbon layer coated in situ on nano-Si surface, which solved the problems of huge volume change and poor conductivity from Si. Experimental results show that nano-Si@C composite exhibits excellent electrochemical properties, such as high initial coulombic efficiency of 87.0%, high capacity of 1 133 mA·h·g-1 after 100 cycles, and high capacity retention rate. Furthermore, the transmission electron microscopy images present strong structural stability of the composite with robust core-shell structure during the discharging/charging cycles, benefiting to improve the cycling stability of the electrode.
