Silicon is an ideal candidate anode material for Li-ion batteries (LIBs). However, it suffers from rapid capacity fading due to large volume expansion upon lithium insertion. Herein, we design and fabricate highly stable carbon coated porous Mg₂Si intermetallic anode material using facile mechano-thermal technique followed by carbon coating using thermal vapour deposition (TVD), toluene as carbon source. The electrode exhibits an excellent first reversible capacity of 726 mAh g⁻¹ at a rate of 100 mA g⁻¹. More importantly, the electrode demonstrates high rate capability (380 mAh g⁻¹ at high rate of 2 A g⁻¹) as well as high cycle stability, with capacity retentions of 65% over 500 cycles. These improvements are attributable to both Mg supporting medium and the uniform carbon coating, which can effectively increase the conductivity and electronic contact of the active material and protects large volume alterations during the electrochemical cycling process.

硅是锂离子电池（LIB）的理想候选阳极材料。然而，由于锂插入时的大体积膨胀，其遭受快速容量衰减的困扰。在这里，我们设计和制造高稳定性的碳涂层多孔Mg ₂ Si金属间阳极材料，采用的是简单的机械热技术，然后使用热气相沉积（TVD），甲苯作为碳源进行碳涂层。电极在100 mA g ^-1的速率下具有726 mAh g ^-1的优异的第一可逆容量。更重要的是，电极演示高倍率性能（380毫安克^-1以2高率A克^-1）以及高循环稳定性，在500次循环中的容量保持率为65％。这些改善归因于Mg支撑介质和均匀的碳涂层，它们可以有效地增加活性物质的电导率和电子接触，并在电化学循环过程中保护大量的体积变化。