电解质
材料科学
锂(药物)
电化学
聚合物
共聚物
化学工程
阴极
离子电导率
电极
无机化学
化学
复合材料
医学
物理化学
工程类
内分泌学
作者
Donglei You,Ziwei Lai,Wei Wei,Huiming Xiong
标识
DOI:10.1002/adfm.202415464
摘要
Abstract All‐solid‐state polymer electrolyte‐based rechargeable batteries paired with high‐voltage cathodes and lithium anodes hold promising prospects to increase the energy density and the safety of lithium metal batteries (LMBs). To improve the stability of the polymer electrolytes at both the positive and negative electrodes, fluorinated polymer electrolytes have been designed and synthesized by copolymerization of epoxide monomers containing cyclic carbonates and fluorinated moieties. The cyclic carbonates possessing a large dielectric constant endow the polymer electrolytes with a high salt solubility. While, the introduction of the fluorinated moieties gives rise to an enhanced oxidation resistance of the electrolytes particularly in the cathode on one hand; on the other hand, it results in in‐chain micelle‐like clusters on the scale of a few nanometers due to the superior hydrophobicity, hence promoting the formation of localized high‐concentration polymer‐in‐salt electrolytes (PISEs) with a high lithium‐ion conductivity and transference number. This synergistic strategy enables a large lithium‐ion transference number of ∼0.72, a wide electrochemical stability window up to 5.2 V, and stable electrode/electrolyte interfaces. The Li/PISE/Li cells demonstrate stable cycling over 1500 h, and the all‐solid‐state NCM811/PISE/Li batteries exhibit a superior discharge capacity and prolonged cycling stability (∼98% capacity retention at 500 cycles) at 30 °C.
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