1, Chemistry, Monash University, Melbourne, Victoria, Australia
Due to high specific capacity and high energy density, lithium-sulfur batteries are considered as promising alternative to conventional lithium-ion batteries. Combining lithium and sulfur could yield as much as high specific energy of 2600 Wh/kg. However, some serious issues like dissolution of active sulfur and polysulfides into electrolyte and their shutting between the anode and cathode impede the practical realization of lithium-sulfur batteries. In this work, lithiated metal oxide (LMO) nanosheets (with an average size of 100 nm) were decorated on the surface of sulfur microparticles of 50-80 μm. The LMO decorated sulfur shows lower rate of dissolution of active material sulfur as well as intermediate polysulfides into the ether-based electrolyte, leading to a low self-discharge rate and high cycling stability. The lithiated metal oxide (LMO) facilitates the transport of Li+ ion throughout the cathode scaffold, resulting higher utilization of active material. At a current rate of 200 mA/g, the LMO decorated sulfur cathode delivers an initial reversible capacity of 788 mAh/g at second cycle and retains a capacity up to 657 mAh/g (83.4% of initial capacity) after 100 cycles. During the meeting discussion, I will elaborate the synthesis procedure and highlight the electrochemical performance of lithiated metal oxide decorated sulfur microparticles as cathode material in lithium-sulfur batteries.