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An Ultrahigh Capacity Graphite/Li 2 S Battery with Holey-Li 2 S Nanoarchitectures.

The pairing of high-capacity Li2 S cathode (1166 mAh g-1 ) and lithium-free anode (LFA) provides an unparalleled potential in developing safe and energy-dense next-generation secondary batteries. However, the low utilization of the Li2 S cathode and the lack of electrolytes compatible to both electrodes are impeding the development. Here, a novel graphite/Li2 S battery system, which features a self-assembled, holey-Li2 S nanoarchitecture and a stable solid electrolyte interface (SEI) on the graphite electrode, is reported. The holey structure on Li2 S is beneficial in decomposing Li2 S at the first charging process due to the enhanced Li ion extraction and transfer from the Li2 S to the electrolyte. In addition, the concentrated dioxolane (DOL)-rich electrolyte designed lowers the irreversible capacity loss for SEI formation. By using the combined strategies, the graphite/holey-Li2 S battery delivers an ultrahigh discharge capacity of 810 mAh g-1 at 0.1 C (based on the mass of Li2 S) and of 714 mAh g-1 at 0.2 C. Moreover, it exhibits a reversible capacity of 300 mAh g-1 after a record lifecycle of 600 cycles at 1 C. These results suggest the great potential of the designed LFA/holey-Li2 S batteries for practical use.

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