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Insight into fast ion migration kinetics of a new hybrid single Li-ion conductor based on aluminate complexes for solid-state Li-ion batteries†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-19 00:00:00 , DOI: 10.1039/c8nr00573g Yancong Feng 1, 2, 3, 4, 5 , Rui Tan 5, 6, 7, 8 , Yan Zhao 5, 6, 7, 8 , Rongtan Gao 5, 6, 7, 8 , Luyi Yang 5, 6, 7, 8 , Jinlong Yang 5, 6, 7, 8 , Hao Li 1, 2, 3, 4, 5 , Guofu Zhou 1, 2, 3, 4, 5 , Haibiao Chen 5, 6, 7, 8 , Feng Pan 5, 6, 7, 8
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-19 00:00:00 , DOI: 10.1039/c8nr00573g Yancong Feng 1, 2, 3, 4, 5 , Rui Tan 5, 6, 7, 8 , Yan Zhao 5, 6, 7, 8 , Rongtan Gao 5, 6, 7, 8 , Luyi Yang 5, 6, 7, 8 , Jinlong Yang 5, 6, 7, 8 , Hao Li 1, 2, 3, 4, 5 , Guofu Zhou 1, 2, 3, 4, 5 , Haibiao Chen 5, 6, 7, 8 , Feng Pan 5, 6, 7, 8
Affiliation
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A novel hybrid single Li-ion conductor (SLIC) for a Li-ion solid electrolyte was prepared by mixing aluminate complexes–polyethylene glycol (LiAl–PEG) and polyethylene oxide (PEO) for solid-state Li-ion batteries. The LiAl–PEG/PEO blend possesses high thermal stability and electrochemical stability with an oxidation decomposition voltage up to 4.8 V. Notably, this hybrid SLIC exhibits not only excellent Li-ion migration kinetics, but also good ionic conductivity as high as 4.0 × 10−5 and 2.6 × 10−4 S cm−1 at 30 and 100 °C, respectively, which is much higher than previously reported SLICs. Importantly, by the combination of molecular dynamics simulations and experiment measurements, the mechanisms of Li-ion migration across the SLIC (LiAl–PEG), the salt-in-polymer (LiClO4/PEO) and the optimized SLIC (LiAl–PEG/PEO) were systematically investigated for the first time. The new hopping transport mechanism was verified for the SLIC system at the nanoscale. As for the hybrid SLIC, PEO chains enhance the segmental mobility of the ether-chains bonded with Al atoms, improve the ionicity, and provide extra ionic paths for Li transfer, resulting in the optimized Li-ion migration kinetics of LiAl–PEG/PEO.
中文翻译：
基于固态铝酸锂电池的新型基于铝酸盐配合物的混合单锂离子导体的快速离子迁移动力学的见解†
通过将铝酸盐配合物–聚乙二醇（LiAl–PEG）和聚环氧乙烷（PEO）混合用于固态锂离子电池，制备了一种用于锂离子固体电解质的新型混合单锂离子导体（SLIC）。LiAl-PEG / PEO共混物具有高的热稳定性和电化学稳定性，氧化分解电压高达4.8V。值得注意的是，这种混合SLIC不仅具有出色的锂离子迁移动力学，而且还具有高达4.0×10的良好离子电导率−5和2.6×10 -4 S cm -1温度分别为30和100°C，远高于以前报道的SLIC。重要的是，结合分子动力学模拟和实验测量，锂离子在SLIC（LiAl–PEG），聚合物中的盐（LiClO 4 / PEO）和优化的SLIC（LiAl–PEG / PEO）进行了系统的首次调查。在纳米尺度上，针对SLIC系统验证了新的跳跃传输机制。对于混合SLIC，PEO链增强了与Al原子键合的醚链的节段迁移率，提高了离子性，并提供了用于Li转移的额外离子路径，从而优化了LiAl–PEG / PEO的Li离子迁移动力学。
更新日期：2018-02-19
中文翻译：
基于固态铝酸锂电池的新型基于铝酸盐配合物的混合单锂离子导体的快速离子迁移动力学的见解†
通过将铝酸盐配合物–聚乙二醇（LiAl–PEG）和聚环氧乙烷（PEO）混合用于固态锂离子电池，制备了一种用于锂离子固体电解质的新型混合单锂离子导体（SLIC）。LiAl-PEG / PEO共混物具有高的热稳定性和电化学稳定性，氧化分解电压高达4.8V。值得注意的是，这种混合SLIC不仅具有出色的锂离子迁移动力学，而且还具有高达4.0×10的良好离子电导率−5和2.6×10 -4 S cm -1温度分别为30和100°C，远高于以前报道的SLIC。重要的是，结合分子动力学模拟和实验测量，锂离子在SLIC（LiAl–PEG），聚合物中的盐（LiClO 4 / PEO）和优化的SLIC（LiAl–PEG / PEO）进行了系统的首次调查。在纳米尺度上，针对SLIC系统验证了新的跳跃传输机制。对于混合SLIC，PEO链增强了与Al原子键合的醚链的节段迁移率，提高了离子性，并提供了用于Li转移的额外离子路径，从而优化了LiAl–PEG / PEO的Li离子迁移动力学。
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