Suppression of Dendritic Lithium Growth by in Situ Formation of a Chemically Stable and Mechanically Strong Solid Electrolyte Interphase,ACS Applied Materials & Interfaces

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Suppression of Dendritic Lithium Growth by in Situ Formation of a Chemically Stable and Mechanically Strong Solid Electrolyte Interphase
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-12-26 00:00:00 , DOI: 10.1021/acsami.7b14662
Guojia Wan ₁ , Feihu Guo ₁ , Hui Li ₂ , Yuliang Cao ₁ , Xinping Ai ₁ , Jiangfeng Qian ₁ , Yangxing Li ₂ , Hanxi Yang ₁

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The growth and proliferation of Li dendrites during repeated Li cycling has long been a crucial issue that hinders the development of secondary Li-metal batteries. Building a stable and robust solid state electrolyte interphase (SEI) on the Li-anode surface is regarded as a promising strategy to overcome the dendrite issues. In this work, we report a simple strategy to engineer the interface chemistry of Li-metal anodes by using tiny amounts of dimethyl sulfate (DMS, C₂H₆SO₄) as the SEI-forming additive. With the preferential reduction of DMS, an SEI layer composed of Li₂S/Li₂O forms on the Li surface. This inorganic SEI layer features high structural modulus and low interfacial resistant, enabling a dense and dendrite-free Li deposition as evidenced by scanning electron microscopy, atomic force microscopy, and in situ optical images. In addition, this SEI layer can prevent the deposited Li from direct contact with corrosive electrolytes, thus rendering an improved cycling stability of Li anodes with an average Coulombic efficiency of 97% for up to 150 cycles. When the DMS additive is introduced into a Li/NCM full cell, the cycle life of Li-metal batteries can be also improved significantly. This work demonstrates a feasible route to suppress Li dendrite growth by designing appropriate film-forming additives to regulate the interfacial properties of the SEI layer, and also the sulfonyl-based derivatives revealed in this work represent a large variety of new film-forming molecules, providing a broad selectivity for constructing high efficiency and cycle-stable Li anodes to address the intrinsic problems of rechargeable Li-metal batteries.

中文翻译：

通过化学稳定和机械强度高的固体电解质中间相的原位形成来抑制树枝状锂的生长

长期以来，锂枝晶在锂循环中的生长和扩散一直是阻碍二次锂金属电池发展的关键问题。在锂阳极表面上建立稳定而坚固的固态电解质中间相（SEI）被认为是克服枝晶问题的一种有前途的策略。在这项工作中，我们报告了一种简单的策略，通过使用少量的硫酸二甲酯（DMS，C ₂ H ₆ SO ₄）作为SEI形成添加剂来设计锂金属阳极的界面化学。随着DMS的优先减少，由Li ₂ S / Li ₂组成的SEI层O在Li表面形成。这种无机SEI层具有高的结构模量和低的界面抗性，通过扫描电子显微镜，原子力显微镜和原位光学图像可以证明，致密且无枝晶状的Li沉积。此外，该SEI层可防止沉积的Li直接与腐蚀性电解质接触，从而提高Li阳极的循环稳定性，在150个循环内平均库仑效率为97％。当将DMS添加剂引入Li / NCM全电池时，锂金属电池的循环寿命也可以显着提高。这项工作展示了通过设计适当的成膜添加剂来调节SEI层的界面性能来抑制Li枝晶生长的可行途径，

更新日期：2017-12-26

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