Si-Ag composite materials were prepared by mechanical alloying method. The morphology and composition of SiAg composites were investigated by SEM and XRD. The electrochemical properties of the composites were determined by charge-discharge tests and cyclic voltammetry. The composite composed of Si∶Ag with an atomic ratio of 1∶1 (sample 1#) showed good cyclic stability and charge-discharge reversibility. The reversible capacity of the composite (sample 1#) was remained over 300 mAh·g-1 after 50 cycles. Experimental results showed that controlling the potential range of charge-discharge processes could enhance the cyclic performance of alloy materials.


lithium-ion batteries, negative material, mechanical alloying method, Si-based materials

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