Battery performance is strongly influenced by the solid electrolyte interphase (SEI) that forms from electrolyte decomposition and remains a key target for engineering design. Whereas traditional approaches to tune the SEI have focused on electrolyte chemistry, we show that manipulating the electric field offers a novel approach. Here, we change the electrical double layer (EDL) composition by either applying or removing the local electric field, which directly controls SEI formation. Surprisingly, the solvent-derived SEI known to form in a conventional electrolyte exhibits anion-enhanced chemistry when the electric field is removed, which is attributed to the Coulombic interaction between the electric field and free anions. With the electric field control, we produce an anion-enhanced SEI in conventional electrolytes that demonstrates improved battery cycling and corrosion resistance. Together, our findings highlight the importance of EDL composition and demonstrate electric field strength as a new parameter to tune SEI structure and chemistry.

中文翻译：

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通过调整双电层成分来设计电池腐蚀膜


电池性能受到电解质分解形成的固体电解质界面 （SEI） 的强烈影响，并且仍然是工程设计的关键目标。虽然调整 SEI 的传统方法侧重于电解质化学，但我们表明操纵电场提供了一种新颖的方法。在这里，我们通过施加或移除局部电场来改变双电层 （EDL） 的组成，这直接控制了 SEI 的形成。令人惊讶的是，当电场被移除时，已知在传统电解质中形成的溶剂衍生的 SEI 表现出阴离子增强的化学反应，这归因于电场和自由阴离子之间的库仑相互作用。通过电场控制，我们在传统电解质中产生阴离子增强的 SEI，显示出改进的电池循环和耐腐蚀性。总之，我们的研究结果强调了 EDL 组成的重要性，并证明了电场强度是调整 SEI 结构和化学的新参数。