An efficient Li2S-based lithium-ion sulfur battery realized by a bifunctional electrolyte additive

In this work, we propose and prepare a facile and feasible Li2S-based lithium-ion sulfur battery system, which is enabled by a bifunctional electrolyte additive. At first, Li2S particles were loaded on the low-cost carbonized commercial wipes by a solution-based infiltration method. Interestingly, for the first time, it is found that the well-designed indium triiodide (InI3) electrolyte additive not only performed as a cathodic redox mediator, reducing the activation potential of Li2S cathode, but also resulted in an passivation layer, preventing the anode from corrosion due to the shuttle effect. Moreover, the manageable amount of lithium ions and the voltage cooperation between the cathode and anode in the full cell rendered the battery with a strong recovery ability against the abusive conditions test, such as over-charge, over-discharge and short-circuit, showing a great potential for practical use.208