Designing electrolyte with multi-ether solvation structure enabling low-temperature sodium ion capacitor
Sodium-ion hybrid capacitors (SICs), which combine the high energy density of batteries with the high power density and long cycle life of capacitors, are considered promising next-generation energy storage devices. Ensuring the performance of SICs in low-temperature environments is crucial for appl...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | International Journal of Extreme Manufacturing |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2631-7990/adbfe0 |
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| Summary: | Sodium-ion hybrid capacitors (SICs), which combine the high energy density of batteries with the high power density and long cycle life of capacitors, are considered promising next-generation energy storage devices. Ensuring the performance of SICs in low-temperature environments is crucial for applications in high-altitude cold regions, where the desolvation process of Na ^+ and the transport process in the solid electrolyte interphase (SEI) are determinant. In this paper, we proposed a multi-ether modulation strategy to construct a solvation sheath with multi-ether participation by modulating the coordination of Na ^+ and solvents. This unique solvation sheath not only reduces the desolvation energy barrier of Na ^+ , but more importantly forms a Na _2 O-rich inorganic SEI and enhances the ionic dynamics of Na ^+ . Benefiting from the excellent solvation structure design, SICs prepared with this electrolyte can achieve energy density of up to 178 Wh·kg ^‒1 and ultra-high power density of 42 390 W·kg ^‒1 at room temperature. Notably, this SIC delivers record-high energy densities of 149 Wh·kg ^‒1 and 119 Wh·kg ^‒1 as well as power densities of up to 25 200 W·kg ^‒1 and 24 591 W·kg ^‒1 at ‒20 °C and ‒40 °C, respectively. This work provides new ideas for the development of high-performance SICs for low-temperature operating environments. |
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| ISSN: | 2631-7990 |