| 초록 |
Owing to the high theoretical specific capacity (1166 mAh g−1), lithium sulfide has been considered as a promising cathode material for Li−S batteries. However, the polysulfide dissolution and low electronic conductivity of Li2S limit its further application in next-generation Li−S batteries. Herein, we proposed an effective strategy is proposed to overcome the limitations associated with the use of a Li2S cathode in Li-S batteries. Tungsten oxide/zirconia (WO3/ZrO2) with a ratio of 3:7 is prepared and incorporated into a 2D compacted Li2S−graphene matrix through pelletization. In the pelletized cathode, simultaneously the incorporated WO3/ZrO2 particles act as a polysulfide mediator to block the outflow of soluble polysulfide into the electrolyte solution. Therefore, the pelletized cathode shows high interfacial stability and thus substantially extends the lifetime of the Li−S battery over 200 cycles at a high Li2S loading of 10 mg cm−2. The practical Li−S full cell fabricated by combining the pelletized cathode and graphite anode achieved a reliable cycling stability over 1500 cycles. |
