Si–AB 5 composites as anode materials for lithium ion batteries

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The Si–AB 5 (MmNi 3.6Co 0.7Al 0.3Mn 0.4 alloy) composites with a high tap density as anode materials for lithium-ion batteries were synthesized by ball-milling. Si nanoparticles are distributed homogeneously on the surface of the AB 5 matrix. The electrochemical performance of the Si–AB 5 composites as a function of Si content was investigated. It is demonstrated that the Si–AB 5 composite delivers a larger reversible capacity and better cycle ability because the inactive AB 5 alloy can accommodate the large volume changes of Si nanoparticles distributed on the surface of the Si–AB 5 composite during cycling. In particular, the Si–AB 5 composite containing 20 wt% Si with the high tap density of 2.8 g/cm 3 obtained after ball-milling for 11 h exhibits an initial and maximum reversible (charge) capacity of 370 and 385 mAh/g. The high capacity retention can be achieved after 50 cycles in the potential range from 0.02 to 1.5 V.