Spherical Metal Oxides with High Tap Density as Sulfur Host to Enhance Cathode Volumetric Capacity for Lithium–Sulfur Battery

• DOI: 10.1021/acsami.9b20111
• Publication Date: 2020-01-16T18:26:46Z
• Authors: Lu Wang; Yi-Hua Song; Bo-Hai Zhang; Ya-Tao Liu; Zhen-Yu Wang; Guo-Ran Li; Sheng Liu; Xue-Ping Gao
• Keywords: Gravimetric analysis; Carbon fibers

Effective hosts of sulfur are essential for the application lithium-sulfur batteries. However, various refined nanomaterials or carbon-based possess low density, high surface area, and large porosity, leading to undesirable reduction on both gravimetric volumetric energy densities. Herein, spherical metal oxides with tap density introduced as carbon-free first time. The ternary show a superior synergistic effect adsorption electrocatalytic conversion soluble intermediate polysulfides. Besides, oxide microspheres can build stable conductive frameworks open channels in porous electrodes fast transport electrons active diffusion electrolyte. Such unique structural feature favorable achieving good utilization cycle performance cathode. Typically, S/LiNi0.8Co0.1Mn0.1O2 composite exhibits stability capacity decay rate (0.057% per cycle) during 500 cycles at 0.1 C. Importantly, due (1.81 g cm-3), delivers larger (1601.9 mAh cm-3-composite), almost 2.3 times S/carbon (689.4 cm-3-composite). Therefore, this work provides feasible strategy reach long life cathode based hosts.