†Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, South Korea.
§Italian Institute of Technology, Via Morego, 30 16163 Genova, Italy.
Nano Lett. 2015 May 13;15(5):2863-8. doi: 10.1021/nl504460s. Epub 2015 Apr 9.
Lithium-sulfur batteries could become an excellent alternative to replace the currently used lithium-ion batteries due to their higher energy density and lower production cost; however, commercialization of lithium-sulfur batteries has so far been limited due to the cyclability problems associated with both the sulfur cathode and the lithium-metal anode. Herein, we demonstrate a highly reliable lithium-sulfur battery showing cycle performance comparable to that of lithium-ion batteries; our design uses a highly reversible dual-type sulfur cathode (solid sulfur electrode and polysulfide catholyte) and a lithiated Si/SiOx nanosphere anode. Our lithium-sulfur cell shows superior battery performance in terms of high specific capacity, excellent charge-discharge efficiency, and remarkable cycle life, delivering a specific capacity of ∼750 mAh g(-1) over 500 cycles (85% of the initial capacity). These promising behaviors may arise from a synergistic effect of the enhanced electrochemical performance of the newly designed anode and the optimized layout of the cathode.
锂硫电池由于其更高的能量密度和更低的生产成本，可能成为取代目前使用的锂离子电池的绝佳选择；然而，由于硫阴极和锂金属阳极相关的循环性能问题，锂硫电池的商业化迄今为止一直受到限制。在此，我们展示了一种具有高可靠性的锂硫电池，其循环性能可与锂离子电池相媲美；我们的设计采用了高可逆的双类型硫阴极（固体硫电极和多硫化物电解液）和锂化 Si/SiOx 纳米球阳极。我们的锂硫电池在高比容量、优异的充放电效率和显著的循环寿命方面表现出卓越的电池性能，在 500 次循环中提供约 750 mAh g(-1)的比容量（初始容量的 85%）。这些有希望的行为可能源于新设计的阳极增强的电化学性能和阴极优化布局的协同效应。
