Y2Ti2O5S2 as a high performance anode material for Li ion batteries

• Layered oxysulfideY2Ti2O5S is a promising candidate for anode for next generation Li ion batteries.
• Y2Ti2O5S as anode has comparable or even better capacity and power performance in comparison with those of Li4Ti5O12.
• Y2Ti2O5S dues to its high electric conductivity may be used free from carbon additives.

The layered oxysulfide Y2Ti2O5S2 (YTOS) is quite promising as a new generation anode material for Li-ion batteries (LIB) for power application. The charge-discharge curve of the YTOS/Li cell indicates that LixY2Ti2O5S has a capacity of 128 mAhg- 1 (509 mAhcm- 3) and a low voltage to Li/Li+ of 0.84 V. The energy density for YTOS-based LIB is comparable to that of Li4Ti5O12 (LTO) based LIB. The electrical conductivity of LixY2Ti2O5S2 without any carbon additive was 5-50 mScm- 1, orders of magnitude higher than that of LTO. The comparison of rate dependence of capacity between YTO without any carbon additive and LTO with carbon additive suggests excellent power performance of YTOS.