Nanoporous TiO2/Co3O4 Composite as an Anode Material for Lithium Ion Batteries
Abstract Nanoporous (NP) TiO 2 /Co 3 O 4 composite is straightforwardly fabricated by dealloying the well designed TiCoAl ternary alloy in mild condition without external oxidation procedures. Upon etching the TiCoAl alloy the Ti and Co atoms undergo the spontaneous oxidation to form the TiO 2 /Co 3 O 4 composite characterized by uniform nanoporous architecture with the pore size mainly distributed around 50 nm. Electrochemical measurements indicate that the NP TiO 2 /Co 3 O 4 composite has superior lithium storage performance as an anode material for lithium ion batteries (LIBs) compared with the pure NP TiO 2 Especially, the NP TiO 2 /Co 3 O 4 composite exhibits enhanced specific capacity, superior cycling stability for 500 cycles, and higher rate capability than pure NP TiO 2 The interconnected network backbone and rich porosity in NP TiO 2 /Co 3 O 4 composite effectively buffers the volume change as well facilitates the diffusion of Li while the combination of Co 3 O 4 is favorable for improving the capacity of the TiO 2 sample.