Title

Suppressed Shuttle via Inhibiting the Formation of Long-Chain Lithium Polysulfides and Functional Separator for Greatly Improved Lithium–Organosulfur Batteries Performance

RIS ID

140482

Publication Details

Li, H., Zhou, Y., Zhao, M., Jin, B., Wen, Z., Xie, H., Dou, S. & Jiang, Q. (2019). Suppressed Shuttle via Inhibiting the Formation of Long-Chain Lithium Polysulfides and Functional Separator for Greatly Improved Lithium–Organosulfur Batteries Performance. Advanced Energy Materials, Online First 1902695-1-1902695-11.

Abstract

The development of lithium–sulfur batteries is limited by the poor conductivity of sulfur cathodes and soluble long-chain lithium polysulfides (LPSs), which cause the low utilization of sulfur and the aversive shuttle effect, and further, give rise to self-discharge, rapid reversible capacity fading, and low Coulombic efficiency. In this work, a novel configuration is built for high-performance lithium–organosulfur batteries, in which the organosulfur hybrid material and lithium metal are used as the cathode and the anode, respectively, and are separated by a functional separator decorated with nitrogen and sulfur co-doped reduced graphite oxide. The organosulfur in the cathode prevents the shuttle effect by inhibiting the formation of long-chain LPSs. In addition, the functional separator effectively adsorbs LPSs escaping from the cathode by electrostatic interactions and further restrains the shuttle effect. These effects are confirmed by density-functional theory calculations. As a result, this novel configuration provides a high initial discharge capacity of 1364 mAh g−1 at 0.2 C and a high discharge capacity of 750 mAh g−1 at 1 C after 700 cycles with a very low capacity decay rate of 0.037% per cycle.

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Link to publisher version (DOI)

http://dx.doi.org/10.1002/aenm.201902695