Tian Liying, Yang Zhenghao, Yuan Shiyi, Milazzo Tye, Cheng Qian, Rasool Syed, Lei Wenrui, Li Wenbo, Yang Yucheng, Jin Tianwei, Cong Shengyu, Wild Joseph Francis, Du Yonghua, Luo Tengfei, Long Donghui, Yang Yuan
Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, US.
Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, China.
Nat Commun. 2024 Sep 5;15(1):7771. doi: 10.1038/s41467-024-51905-6.
Alkaline metal sulfur (AMS) batteries offer a promising solution for grid-level energy storage due to their low cost and long cycle life. However, the formation of solid compounds such as MS and MS (M = Na, K) during cycling limits their performance. Here we unveil intermediate-temperature K-Na/S batteries utilizing advanced electrolytes that dissolve all polysulfides and sulfides (KS, x = 1-8), significantly enhancing reaction kinetics, specific capacity, and energy density. These batteries achieve near-theoretical capacity (1655 mAh g sulfur) at 75 °C with a 1 M sulfur concentration. At a 4 M sulfur concentration, they deliver 830 mAh g at 2 mA cm, retaining 71% capacity after 1000 cycles. This new K-Na/S battery with specific energy of 150-250 Wh kg only employs earth-abundant elements, making it attractive for long-duration energy storage.
碱金属硫（AMS）电池因其低成本和长循环寿命，为电网级储能提供了一个有前景的解决方案。然而，循环过程中诸如MS和MS（M = Na、K）等固体化合物的形成限制了它们的性能。在此，我们展示了利用先进电解质的中温K-Na/S电池，该电解质能溶解所有多硫化物和硫化物（KS，x = 1-8），显著提高反应动力学、比容量和能量密度。这些电池在75°C、硫浓度为1 M时实现了接近理论容量（1655 mAh g硫）。在硫浓度为4 M时，它们在2 mA cm下可提供830 mAh g，在1000次循环后仍保留71%的容量。这种比能量为150-250 Wh kg的新型K-Na/S电池仅使用储量丰富的元素，使其在长时间储能方面具有吸引力。
