Characteristics of High-capacity SiO-C Anodes Containing Olivine-type LiMgPO₄ Compounds for Lithium Secondary Batteries

Abstract

The anode properties of carbon-coated SiO (SiO-C) electrode materials containing a small amount of olivine-type LiMgPO₄ powder as the additive were investigated in a lithium cell. The 2 wt% LiMgPO₄ (LMP)-containing SiO-C anode exhibited a high charge/discharge capacity of 1500 mAh g⁻¹ (versus SiO) and good cycle performance. In addition, the high-rate discharge performance was improved by the addition of LMP. The thermal stability of the electrode material was studied by differential scanning calorimetry (DSC). The thermal stability of the SiO-C anode material was improved by the addition of LMP powder.