Department of Chemistry, ‡Smalley-Curl Institute and The NanoCarbon Center, and §Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
ACS Nano. 2017 Jun 27;11(6):6362-6369. doi: 10.1021/acsnano.7b02731. Epub 2017 May 19.
The drive for significant advancement in battery capacity and energy density inspired a revisit to the use of Li metal anodes. We report the use of a seamless graphene-carbon nanotube (GCNT) electrode to reversibly store Li metal with complete dendrite formation suppression. The GCNT-Li capacity of 3351 mAh g approaches that of bare Li metal (3861 mAh g), indicating the low contributing mass of GCNT, while yielding a practical areal capacity up to 4 mAh cm and cycle stability. A full battery based on GCNT-Li/sulfurized carbon (SC) is demonstrated with high energy density (752 Wh kg total electrodes, where total electrodes = GCNT-Li + SC + binder), high areal capacity (2 mAh cm), and cyclability (80% retention at >500 cycles) and is free of Li polysulfides and dendrites that would cause severe capacity fade.
对显著提高电池容量和能量密度的追求促使人们重新审视使用锂金属阳极。我们报告了使用无缝石墨烯-碳纳米管（GCNT）电极来可逆地储存锂金属，完全抑制枝晶形成。GCNT-Li 的容量为 3351 mAh g，接近裸锂金属的容量（3861 mAh g），表明 GCNT 的贡献质量较低，同时可实现高达 4 mAh cm 的实际面容量和循环稳定性。基于 GCNT-Li/硫化碳（SC）的全电池具有高能量密度（总电极 752 Wh kg，其中总电极=GCNT-Li+SC+粘结剂）、高面容量（2 mAh cm）和循环稳定性（>500 次循环时保持 80%的容量），且不存在会导致严重容量衰减的锂多硫化物和枝晶。
