锂(药物)
离子液体
电化学
阳极
化学
氧化还原
溴化物
离子键合
亚甲基
聚合
无机化学
扩散
三嗪
离子
高分子化学
电极
光化学
聚合物
有机化学
物理化学
催化作用
医学
物理
热力学
内分泌学
作者
Gege Yang,Gaolei Wang,Yuxin Min,Le Zhou,Chaofan Yang,Junjie Huang,Guoliang Dai
标识
DOI:10.1016/j.electacta.2023.143498
摘要
For organic electrode materials, slow Li+ diffusion kinetics is a main obstacle to the realization of high lithium storage capacity through a super-lithiation reaction. Here, bipyridinium-based polymerized ionic liquids (PILs) have been synthesized by the ionothermal trimerization of 1,1-dicyanomethyl bipyridinium bromide ILs in molten ZnCl2 matrix, and are used as an anode material for the first time. In which, the ionic chains are beneficial for fast Li+ diffusion, as well as the p-π resonance structure between methylene and aromatic ring helps the electron conduction. Electrochemical analysis shows PILs-400 can deliver 1201.5 mAh g−1 at 0.1 A g−1 and almost no capacity loss with the capacity of 873.6 mAh g−1 over 500 cycles at 2 A g−1. Theoretical calculation reveals that all functional groups of triazine, methylene, and bipyridinium have taken part in the redox reaction, and this reaction is associated with a three-step insertion process of 19 Li+ for each repetitive unit in forming Li19C14N5, along with the reversible formation of N-Li and C-Li bonds.
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