Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Angew Chem Int Ed Engl. 2016 Aug 22;55(35):10372-5. doi: 10.1002/anie.201605931. Epub 2016 Jul 27.
The lithium-sulfur battery is regarded as one of the most promising candidates for lithium-metal batteries with high energy density. However, dendrite Li formation and low cycle efficiency of the Li anode as well as unstable sulfur based cathode still hinder its practical application. Herein a novel electrolyte (1 m LiODFB/EC-DMC-FEC) is designed not only to address the above problems of Li anode but also to match sulfur cathode perfectly, leading to extraordinary electrochemical performances. Using this electrolyte, lithium|lithium cells can cycle stably for above 2000 hours and the average Coulumbic efficiency reaches 98.8 %. Moreover, the Li-S battery delivers a reversible capacity of about 1400 mAh g(-1) sulfur with retention of 89 % for 1100 cycles at 1 C, and a capacity above 1100 mAh g(-1) sulfur at 10 C. The more advantages of this cell system are its outstanding cycle stability at 60 °C and no self-discharge phenomena.
锂硫电池被认为是高能量密度锂金属电池最有前途的候选者之一。然而，枝晶锂的形成和锂阳极的低循环效率以及不稳定的硫基阴极仍然阻碍了其实际应用。在此，设计了一种新型电解质（1 m LiODFB/EC-DMC-FEC），不仅可以解决锂阳极的上述问题，而且可以与硫阴极完美匹配，从而获得卓越的电化学性能。使用这种电解质，锂|锂电池可以稳定循环超过 2000 小时，平均库仑效率达到 98.8%。此外，Li-S 电池在 1 C 下循环 1100 次后，可逆容量约为 1400 mAh g(-1) 硫，保留率为 89%，在 10 C 时的容量超过 1100 mAh g(-1) 硫。该电池系统的更多优点是在 60°C 时具有出色的循环稳定性，并且没有自放电现象。
