中国科学院化学所Yu-Guo Guo研究小组取得一项新突破。他们的最新研究发现改善固体电解质界面（SEI）的电子泄露有助于稳定钠离子电池。2022年11月28日，国际知名学术期刊《德国应用化学》发表了这一成果。

在该研究中，团队通过添加策略构建了两种具有不同生长行为的SEI层，并详细研究了SEI的理化特征（形貌和成分信息）和电子性质（LUMO能级、带隙、电子功函数）。实验和计算分析表明，具有生长抑制的SEI层既具有较低的电子驱动力，又具有较高的电子绝缘能力。这一性质降低了电子泄漏，抑制了SEI的持续增长，有利于界面稳定，提高了电化学性能。

研究人员表示，钠离子电池的界面稳定性对其使用寿命和安全性有着重要的影响。然而，连续的固体电解质界面生长会降低其稳定性。从本质上讲，SEI的生长与电子泄漏行为有关，但很少有人从减轻电子泄漏的角度试图抑制SEI的生长。

附：英文原文

Title: Mitigating Electron Leakage of Solid Electrolyte Interface for Stable Sodium-Ion Batteries

Author: Enhui Wang, Jing Wan, Yu-Jie Guo, Qianyu Zhang, Wei-Huan He, Chao-Hui Zhang, Wan-Ping Chen, Hui-Juan Yan, Ding-Jiang Xue, Tiantian Fang, Fuyi Wang, Rui Wen, Sen Xin, Ya-Xia Yin, Yu-Guo Guo

Issue&Volume: 2022-11-28

Abstract: The interfacial stability is highly responsible for the longevity and safety of sodium ion batteries (SIBs). However, the continuous solid-electrolyte interface (SEI) growth would deteriorate its stability. Essentially, the SEI growth is associated with the electron leakage behavior, yet few efforts have tried to suppress the SEI growth, from the perspective of mitigating electron leakage. Herein, we built two kinds of SEI layers with distinct growth behaviors, via the additive strategy. The SEI physicochemical features (morphology and componential information) and SEI electronic properties (LUMO level, band gap, electron work function) were investigated elaborately. Experimental and calculational analyses showed that, the SEI layer with suppressed growth delivers both the low electron driving force and the high electron insulation ability. Thus, the electron leakage is mitigated, which restrains the continuous SEI growth, and favors the interface stability with enhanced electrochemical performance.

DOI: 10.1002/anie.202216354

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202216354