Fabrication of Dual-Modified Carbon Network Enabling Improved Electronic and Ionic Conductivities for Fast and Durable Li2TiSiO5 Anodes

Li2TiSiO5 was recently proposed as a Ti-based anode material for lithium-ion batteries (LIBs), with the desirable characteristics of low discharge potential and relatively high specific capacity. However, the intrinsically poor electronic and ionic conductivities give rise to its sluggish electrochemical performance. In this work, Li2TiSiO5 modified with a dual-carbon network (C@LTSO/CNT) is developed by performing a facile synthesis. The obtained dual-carbon network coupled with small-sized LTSO particles delivers enhanced electron conductivity frameworks, abundant active interfaces, and a notably higher inner porosity for multidirectional ion diffusion. Such a unique architecture leads to a high specific capacity as well as an ultrafast electrochemical process for LTSO through remarkable electronic and ionic transfer. C@LTSO/CNT electrodes with a low discharge plateau at 0.28 V achieve an extremely competitive specific capacity of over 430 mAh g(-1) at 0.5 C, a superb high-rate performance over 125 mAh g(-1) up to 10 C, and a stable cycle lifespan of 1500 cycles without any degradation, displaying significant potential as an ideal anode candidate. Thus, a high-performance LIB full cell is fabricated with a C@LTSO/CNT anode and a LiFePO4 cathode. This cell shows an energy density of 200 Wh kg(-1) with greatly improved properties of high-power density and pronounced cycling stability.