Deciphering Interfacial Reactions via Optical Sensing to Tune the Interphase Chemistry for Optimized Na-Ion Electrolyte Formulation,Advanced Energy Materials

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Deciphering Interfacial Reactions via Optical Sensing to Tune the Interphase Chemistry for Optimized Na-Ion Electrolyte Formulation
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-08-08 , DOI: 10.1002/aenm.202101490
Parth Desai _{1,

2,

3} , Jiaqiang Huang _{1,

3} , Hussein Hijazi ₁ , Leiting Zhang ₄ , Sathiya Mariyappan _{1,

3} , Jean‐Marie Tarascon _{1,

2,

3}

Affiliation

Interphases, solid-electrolyte interphase (SEI), and cathode-electrolyte interphase (CEI) are the key influencers in determining battery life and performance. Especially, for technologies such as sodium-ion batteries that are in the development stage, it is crucial to tune the interphase chemistry without which it suffers at present from poor performance metrics for reaching real-life applications. In this study, optical sensors are utilized as a tool to follow operando, the thermal events of interfacial reactions, and establish the role of different electrolyte additives during the SEI/CEI formation. Using the acquired knowledge from sensing, together with complementary studies in Na-ion full-cells, a new electrolyte formulation is proposed that shows stable cycling performance at 0–55 °C with very low self-discharge and improves safety due to mitigated gassing during cycling. Finally, the studies are nurtured by transferring the know-how to prototype cylindrical 18 650 cells. It is hoped that such findings will accelerate the practical development of Na-ion batteries.

中文翻译：

通过光学传感破译界面反应以调整界面化学以优化钠离子电解质配方

中间相、固体电解质中间相 (SEI) 和阴极电解质中间相 (CEI) 是决定电池寿命和性能的关键影响因素。特别是，对于处于开发阶段的钠离子电池等技术，调整相间化学至关重要，否则它目前会因实现实际应用的性能指标不佳而受到影响。在这项研究中，光学传感器被用作跟踪操作、界面反应的热事件的工具，并确定不同电解质添加剂在 SEI/CEI 形成过程中的作用。利用从传感中获得的知识，以及对钠离子全细胞的补充研究，提出了一种新的电解质配方，它在 0-55°C 下表现出稳定的循环性能，并且自放电非常低，并且由于在循环过程中减少了放气而提高了安全性。最后，通过将专有技术转移到圆柱形 18 650 电池原型来培养研究。希望这些发现将加速钠离子电池的实际发展。

更新日期：2021-09-23

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