Journal
CHEMICAL SCIENCE
Volume 13, Issue 12, Pages 3416-3423Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc06745a
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Funding
- National Natural Science Foundation of China [22109075, 21835004, 22020102002]
- National Key R&D Program of China [2017YFA0206700]
- 111 Project from the Ministry of Education of China [B12015]
- Frontiers Science Center for New Organic Matter of Nankai University [63181206]
- Haihe Laboratory of Sustainable Chemical Transformations
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A high-performance PEO-based all-solid-state electrolyte for sodium batteries is developed by introducing Na3SbS4 to interact with the TFSI- anion in the salt and decrease the crystallinity of PEO. The electrolyte exhibits significantly improved Na+ transference number and ionic conductivity. It can also alleviate Na+ depletion and enable stable and dendrite-free Na plating/stripping.
All-solid-state sodium batteries with poly(ethylene oxide) (PEO)-based electrolytes have shown great promise for large-scale energy storage applications. However, the reported PEO-based electrolytes still suffer from a low Na+ transference number and poor ionic conductivity, which mainly result from the simultaneous migration of Na+ and anions, the high crystallinity of PEO, and the low concentration of free Na+. Here, we report a high-performance PEO-based all-solid-state electrolyte for sodium batteries by introducing Na3SbS4 to interact with the TFSI- anion in the salt and decrease the crystallinity of PEO. The optimal PEO/NaTFSI/Na3SbS4 electrolyte exhibits a remarkably enhanced Na+ transference number (0.49) and a high ionic conductivity of 1.33 x 10(-4) S cm(-1) at 45 degrees C. Moreover, we found that the electrolyte can largely alleviate Na+ depletion near the electrode surface in symmetric cells and, thus, contributes to stable and dendrite-free Na plating/stripping for 500 h. Furthermore, all-solid-state Na batteries with a 3,4,9,10-perylenetetracarboxylic dianhydride cathode exhibit a high capacity retention of 84% after 200 cycles and superior rate performance (up to 10C). Our work develops an effective way to realize a high-performance all-solid-state electrolyte for sodium batteries.
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