Nano Li4Ti5O12 as sulfur host for high-performance Li-S battery

S/Li4Ti5O12 cathode with high lithium ionic conductivity was prepared for Li-S battery. Herein, nano Li4Ti5O12 is used as sulfur host and fast Li+ conductor, which can adsorb effectively polysulfides and improve remarkably Li+ diffusion coefficient in sulfur cathode. At 0.5 C, S/Li4Ti5O12 cathode has a stable discharge capacity of 616 mAh g−1 at the 700th cycle and a capacity loss per cycle of 0.0196% from the second to the 700th cycle, but the corresponding values of S/C cathode are 437 mAh g−1 and 0.0598%. Even at 2 C, the capacity loss per cycle of S/Li4Ti5O12 cathode is only 0.0273% from the second to the 700th cycle. The results indicate that Li4Ti5O12 as the sulfur host plays a key role on the high performance of Li-S battery due to reducing the shuttle effect and enhancing lithium ionic conductivity.