Investigation of CrSi2 and MoSi2 as anode materials for lithium-ion batteries

Abstract We report on the suitability of the two metal silicides MoSi 2 and CrSi 2 as anode materials for Li-ion batteries. The two materials were synthesized by high energy ball milling of the corresponding metals and X-ray diffraction was used to follow the evolution/formation of the crystalline phases. The in-house prepared powders have shown better battery performance than commercial powders (as-received or ball-milled). We observed that 20 h were necessary for the formation of MoSi 2 whereas 100 h were needed for the formation of the CrSi 2 powder. The best battery performance was obtained with the synthesized CrSi 2 powder that has a theoretical capacity value of 469 mAh g −1 . This powder provided capacities of 340, 262, 167, 110, and 58 mAh g −1 at C/12, C/6, C/2, C, and 2C, respectively. Cycling at 60 °C showed higher capacity values, but with a faster fade of these values.