Abstract
Lithium-sulfur (Li-S) battery with high theoretical energy density of 2600 Wh/kg, expected to be next generation battery. In reality Li-dendrite growth, polysulfide formation, shuttling effect, low conductivity of sulfur and low active material loading become major challenges to develop Li-S battery technology. To overcome these problems we have tried a bilayer separator, which consists of low dimensional molybdenum oxide (MoO3) nanorods on one side and polymer on other side to prevent the migration of polysulfides. The low dimensional transition metal oxide was prepared by simple physical grinding process. 10 wt% solution was prepared in isopropyl alcohol (IPA) and spray coated onto one side of the celgard. Initial capacity of 1185 mAh/g was achieved at 0.5 C (1C=1675mAh/g) and at the end of 500 cycles 80% initial discharge capacity was retained with degradation rate of 0.04% per cycle. Rate capability of the Li-S battery using MoO3 coated separator was measured starting with 0.5 C rate followed by 1 C, 2 C, 3 C, 4 C and finally, return to 0.5 C and the test illustrates that the Li-S battery possesses very good rate capability by showing 93.21% retention of initial discharge capacity. Figure 1
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