High-performance all-solid-state electrolyte for sodium batteries enabled by the interaction between the anion in salt and Na(3)SbS(4).
High-performance all-solid-state electrolyte for sodium batteries enabled by the interaction between the anion in salt and Na(3)SbS(4).
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DOI：
10.1039/d1sc06745a
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发表时间：
2022-03-24
期刊：
影响因子：
8.4
通讯作者：
Chen J
中科院分区：
文献类型：
--
作者：
Lu Y;Li L;Zhang Q;Cai Y;Ni Y;Chen J
全固态钠电池与聚（环氧乙烷）（PEO）为基础的电解质已显示出巨大的潜力，为大规模的能量存储应用。然而，报道的基于PEO的电解质仍然遭受低Na+迁移数和差的离子电导率，这主要是由于Na+和阴离子的同时迁移、PEO的高结晶度和低浓度的游离Na+。在这里，我们报告了一种用于钠电池的高性能基于PEO的全固态电解质，通过引入Na 3SbS 4与盐中的TFSI−阴离子相互作用并降低PEO的结晶度。最佳电解质PEO/NaTFSI/Na 3SbS 4在45 °C时具有显著提高的Na+迁移数（0.49）和1.33 × 10− 4S cm−1的高离子电导率。此外，我们发现电解质可以在很大程度上缓解对称电池中电极表面附近的Na+耗尽，从而有助于稳定且无枝晶的Na镀/脱膜500小时。此外，具有3，4，9，10-二萘嵌苯四甲酸二酐阴极的全固态钠电池在200次循环后表现出84%的高容量保持率和优异的上级倍率性能（高达10 C）。我们的工作为实现高性能全固态钠电池电解质提供了一条有效途径。一种用于钠电池的高性能全固态PEO/NaTFSI/Na 3SbS 4电解质由于盐中TFSI−与Na 3SbS 4之间的静电相互作用而实现，该静电相互作用固定TFSI−阴离子并促进NaTFSI的解离。
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 × 10−4 S cm−1 at 45 °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. A high-performance all-solid-state PEO/NaTFSI/Na3SbS4 electrolyte for sodium batteries is realized owing to the electrostatic interaction between TFSI− in the salt and Na3SbS4, which immobilizes TFSI− anions and promotes the dissociation of NaTFSI.
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