Solid electrolyte interphase manipulation towards highly stable hard carbon anodes for sodium ion batteries
Solid electrolyte interphase manipulation towards highly stable hard carbon anodes for sodium ion batteries
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用于钠离子电池的高稳定硬碳阳极的固体电解质界面操纵
DOI：
10.1016/j.ensm.2019.10.006
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发表时间：
2020-03-01
影响因子：
20.4
通讯作者：
Xu, Yunhua
中科院分区：
文献类型：
--
作者：
Bai, Panxing;Han, Xinpeng;Xu, Yunhua
具有可控性质的电解质和界面化学是提高钠离子电池中硬碳的循环稳定性和倍率性能的关键。在这里，开发了一种简单但有效的策略，通过将少量的酯添加剂作为SEI膜形成剂引入到醚基电解质中，在硬碳阳极上构建可持续的固体电解质界面（SEI）膜。酯分子参与钠离子溶剂化结构促进其还原以产生更多的有机聚合物组分。结合醚基电解质的高离子电导率，这种SEI膜可以有效地保护硬碳电极免受结构变化，因此，表现出非凡的循环性能，在1A g（-1）的高速率下2000次循环后具有211 mAh g（-1）的显著容量，对应于95.6%的相当高的容量保持率。在这项工作中开发的可扩展杠杆突出了电解质筛选和界面组成控制的承诺，以实现更高效的电池化学。
Electrolytes and interfacial chemistry with controllable properties are critical to improve the cycling stability and rate capability of hard carbons in sodium-ion batteries. Here a simple but effective strategy was developed to construct a sustainable solid electrolyte interphase (SEI) film on hard carbon anodes by introducing a small amount of ester additives as SEI film formation agents into an ether-based electrolyte. The involvement of the ester molecule into the sodium ion solvation structure promotes its reduction to produce more organic polymeric components. Combining the high ionic conductivity of ether-based electrolytes, such SEI film can effectively protect hard carbon electrodes from structural changes, and thus, demonstrating an extraordinary cycling performance with a remarkable capacity of 211 mAh g(-1) after 2000 cycles at a high rate of 1 A g(-1), corresponding to a quite high capacity retention of 95.6%. The scalable leverage developed in this work highlights the promise of electrolyte screening and interfacial composition control for more efficient battery chemistries.