Lithium Intercalation of MoO2/C Composite as Anode Material for Lithium-Ion Batteries

Transition metal oxides as an alternative to carbonaceous anode materials such as graphite have been investigated by many researchers during the past. Li4Ti5O12(LTO) has been gained considerable attention due to its high rate capability, the excellent cyclability and safety. But its low energy density due to theoretical capacity(175mAh/g) has restricted the application to the anode material for commercial secondary lithium ion battery. Here, we report MoO2/C composite as attractive intercalation anode material candidate because of its several advantages such as relatively low working potential vs Li (1.5V) and high capacity as 209mAh/g (LiMoO2). According to the previous studies on MoO2 electrode, irreversible phase transition from monoclinic to orthorhombic structure when lithium inserted into MoO2 lattice, resulted in drastic capacity fading of MoO2 electrode with several cycles (1-2). However, as shown in Fig.1, MoO2/C composite anode introduced in this work showed excellent capacity retention (90 % of the initial capacity after 100cycles). In this presentation, more detailed electrochemical performances of MoO2/C composite anode and ex-situ XRD analysis of lithium intercalated MoO2/C composite anode will be discussed.