电解质
离子液体
锂(药物)
聚合
化学工程
材料科学
固态
无机化学
化学
聚合物
有机化学
物理化学
电极
催化作用
复合材料
工程类
医学
内分泌学
作者
Bowen Chen,Ke Xu,Lingfei Tang,Quan Li,Qi Chen,Liwei Chen
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2024-12-19
卷期号:: 305-312
标识
DOI:10.1021/acsenergylett.4c02430
摘要
Polymerized ionic liquid (PIL) electrolytes with high flaming resistance, wide electrochemical stability window, and high flexibility have been widely explored for high safety, high energy density, and long-cycle lithium metal batteries (LMBs). Great efforts have been made in inhibiting anion movement in the PIL to increase the lithium transference number (tLi+), which reduces polarization loss and improves rate performance. However, the effect of tLi+ on the cycle performance is often overlooked because of self-limiting parasitic interfacial reactions involving anions. Here, PIL migration induced by mobile anions was visualized in operando via cross-sectional atomic force microscopy. Intense migration of the PIL with a low tLi+ breaks the interphase on electrodes and exacerbates anion decomposition, resulting in escalating interfacial impedance. The increased tLi+ inhibits interfacial electromechanical degradation and enhances cycle performance. This work reveals the pivotal but often unnoticed role of interfacial electro-mechanical coupling in PIL-based LMBs by taking advantages of in operando scrutiny of the buried interface.
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