Nix the Metal in Li-Ion Sulfer Batteries Thanks to Graphene




Team develops high-capacity Li-ion sulfur battery; no Li-metal anode

The “classic” high-energy capacity Lithium-sulfur battery is predicated on the use of a sulfur-based cathode and a Lithium-metal anode. Among the issues hampering the commercialization of this attractive technology are the safety and performance issues associated with the use of the lithium-metal anode. Accordingly, a number of different approaches have been taken to try to address these issues.

Now, a team from Spain, Italy and Germany reports an efficient lithium‐ion battery using an enhanced sulfur–carbon composite cathode that exploits graphene carbon with a 3D array (3DG‐S) and a silicon oxide‐based anode (LiySiOx–C)—i.e. avoiding the use of a Li metal anode entirely.

In a half-cell, the 3DG-S electrode showed capacities of 1200 and 1000 mAh g−1 at C/10 and 1C rates, respectively. The LiySiOx–C/3DG‐S battery showed a capacity of approximately 460 mAh gS−1 delivered at an average voltage of approximately 1.5 V—yielding a theoretical energy density approaching 700 Wh kgS−1—over 200 cycles, suggesting that the characterized materials would be suitable candidates for low‐cost and high‐energy‐storage applications. A paper on their work is published in the journal ChemSusChem.


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