Abstract
Lithium-sulfur batteries have been regarded as one of the most promising new battery technologies due to high theoretical energy density (2600 Wh kg-1) , the abundant resource and low cost of sulfur. However, both sulfur cathodes and lithium metal anodes can’t meet the design requirements for high specific energy batteries. In this talk we will introduce a new reaction pathway and by using Se or Te as eutectic accelerator to boost reaction kinetics, it is possible to eliminate polysulfide dissolution while under the dissolution deposition mechanism and obtain high performance sulfur cathode compatible with both ether and carbonate electrolytes. Meanwhile, for lithium metal anode, we have developed an polymer/alloy hybrid layer through a facile reaction. The hybrid layer is not only beneficial for uniform deposition of lithium and inhibiting the formation of lithium dendrites, but also greatly improves the stability to moisture and obtains relatively stable cycle performance. With the newly developed anode and cathode materials, a high specific energy lithium-sulfur secondary battery with significantly improved performance is obtained, and the energy density and cycle life are expected to show breakthrough in large batteries. References Zhipeng Jiang, Liu Jin, Zhilong Han, Wei Hu, Ziqi Zeng, Yulong Sun, Jia Xie*, Angew. Chem. Int. Ed., 2019, 58, 11374-11378Xin Chen, Linfeng Peng, Bin Shan, et al and Lixia Yuan* & Jia Xie *, Nat. Commun. 2019, 10, 1021Shuping Li, Zhilong Han, Bin Shan, et al and Jia Xie*, Nano Energy , 2019, 60,153-161Shuping Li, Ziqi Zeng, Bin Shan, et al, and Jia Xie *, ACS Appl. Energy Mater. 2019, 2, 4, 2956-2964Yunyang Zhang, Yulong Sun, Bin Shan, et al and Jia Xie*, Energy Storage Mater., 2019, 21, 287-296
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