1. Designing electrolytes with high solubility of sulfides/disulfides for high-energy-density and low-cost K-Na/S batteries
- Author
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Liying Tian, Zhenghao Yang, Shiyi Yuan, Tye Milazzo, Qian Cheng, Syed Rasool, Wenrui Lei, Wenbo Li, Yucheng Yang, Tianwei Jin, Shengyu Cong, Joseph Francis Wild, Yonghua Du, Tengfei Luo, Donghui Long, and Yuan Yang
- Subjects
Science - Abstract
Abstract 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 M2S2 and M2S (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 (K2Sx, x = 1–8), significantly enhancing reaction kinetics, specific capacity, and energy density. These batteries achieve near-theoretical capacity (1655 mAh g−1 sulfur) at 75 °C with a 1 M sulfur concentration. At a 4 M sulfur concentration, they deliver 830 mAh g−1 at 2 mA cm−2, retaining 71% capacity after 1000 cycles. This new K-Na/S battery with specific energy of 150-250 Wh kg−1 only employs earth-abundant elements, making it attractive for long-duration energy storage.
- Published
- 2024
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