Towards Stable Sodium Metal Battery with High Voltage Output through Dual Electrolyte Design
Towards Stable Sodium Metal Battery with High Voltage Output through Dual Electrolyte Design
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DOI：
10.1016/j.ensm.2022.03.040
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发表时间：
2022-03
影响因子：
20.4
通讯作者：
Ming Zhu;Xiaoyang Zheng;Lulu Li;Xiaolong Zhu;Zhongyi Huang;Guanyao Wang;Yuanjun Zhang;Haoran Liu
中科院分区：
文献类型：
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作者：
Ming Zhu;Xiaoyang Zheng;Lulu Li;Xiaolong Zhu;Zhongyi Huang;Guanyao Wang;Yuanjun Zhang;Haoran Liu
钠金属电池（SMB）的应用受到电解质与Na之间的副反应以及Na枝晶生长的显着挑战的阻碍。在此，我们报告了双隔膜内双电解质的独特设计，即聚丙烯隔膜中的贫二甘醇二甲醚基电解质与玻璃纤维隔膜中的环丁砜基电解质（表示为D-e@PP/S-e@GF），可以有效防止Na枝晶生长并抑制副反应。 D-e@PP/S-e@GF利用D-e和S-e对隔膜润湿性的差异，巧妙地结合了D-e和S-e的优点。有限元法（FEM）模拟和原位光学显微镜表明，D-e@PP 层促进均匀沉积并显着减少副反应。 S-e@GF层可以与高压阴极配对。 D-e@PP/S-e@GF 在 Na||Na 对称电池中，在 0.5 mAh cm−2 下 560 次循环后，Na 电镀/剥离的 CE 高达 97.22%，在 1 mAh cm−2 下超长循环寿命超过 1900 小时。此外，该设计还展示了使用Na3V2(PO4) (NVP)和普鲁士蓝(PB)作为阴极的全电池优异的循环稳定性。双隔膜内双电解质的独特设计为开发高性能中小企业提供了一条新的、有前途的途径。
The application of sodium metal batteries (SMBs) is hindered by the notable challenges of side reactions between electrolyte and Na as well as the growth of Na dendrites. Herein, we report that a unique design of dual electrolytes within double separators, namely lean diglyme-based electrolyte hosted by the polypropylene separator together with sulfolane-based electrolyte hosted by the glass fiber separator (denoted as D-e@PP/S-e@GF), can effectively prevent Na dendrite growth and suppress side reactions. D-e@PP/S-e@GF ingeniously combines the advantages of D-e and S-e by using their wettability difference on separators. Finite element method (FEM) simulations and in-situ optical microscopy reveal that the D-e@PP layer promotes uniform deposition and significantly reduces side reactions. The S-e@GF layer can be paired with high voltage cathodes. D-e@PP/S-e@GF enables a high CE of Na plating/stripping as high as 97.22% over 560 cycles at 0.5 mAh cm−2and ultra-long cycle life of more than 1900 h at 1 mAh cm−2in Na||Na symmetric cell. Furthermore, this design also demonstrates excellent cycling stability of full cells using Na3V2(PO4) (NVP) and Prussian Blue (PB) as cathodes. The unique design of dual electrolytes within double separators provides a new and promising avenue to develop high-performance SMBs.