Low-Temperature Sodium-Sulfur Batteries Enabled by Ionic Liquid in Localized High Concentration Electrolytes

被引:0
作者
Guo, Dong [1 ,2 ]
Wang, Jiaao [3 ]
Cui, Zehao [1 ,2 ]
Shi, Zixiong [4 ]
Henkelman, Graeme [3 ]
Alshareef, Husam N. [4 ]
Manthiram, Arumugam [1 ,2 ]
机构
[1] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
[2] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA
[3] Univ Texas Austin, Dept Chem, Austin, TX 78712 USA
[4] King Abdullah Univ Sci & Technol KAUST, Phys Sci & Engn Div, Mat Sci & Engn, Thuwal 239556900, Saudi Arabia
关键词
electrolyte engineering; ionic liquid; low-temperature batteries; sodium metal batteries; sodium-sulfur batteries; METAL BATTERIES;
D O I
10.1002/adfm.202409494
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Low ionic migration and compromised interfacial stability pose challenges for low-temperature batteries. In this work, we discovered that even with the state-of-the-art localized high-concentration electrolytes (LHCEs), uncontrolled Na electrodeposition occurs with a huge overpotential of >1.2 V at -20 degrees C, leading to cell failure within tens of hours. To address this, we introduce a new electrolyte category that incorporates an ionic liquid as a key solvation species. Diverging from traditional LHCEs, the IL-tailored LHCE facilitates an anion-solvent-molecules exchange within the solvation sheath between Na+ and organic cations at low temperatures. This behavior reduces solvation cluster size and strengthens Na+-anion coordination, which proves instrumental in enabling fast ionic dynamics in both the bulk liquid and at the interface. Therefore, durable Na electrodeposition and shuttle-free, 0.5 Ah sodium-sulfur pouch cells are achieved at -20 degrees C, for the first time, surpassing the limitations of typical LHCEs. This tailoring strategy opens a new design direction for advanced batteries operating in fast-charge and wide-temperature scenarios.
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页数:10
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