Hui Duan, Changhong Wang, Xu-Sheng Zhang, Jiamin Fu, Weihan Li, Jing Wan, Ruizhi Yu, Min Fan, Fucheng Ren, Shuo Wang, Matthew Zheng, Xiaona Li, Jianwen Liang, Rui Wen, Sen Xin, Yu-Guo Guo, Xueliang Sun
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引用次数: 0
摘要
氯化锂具有很高的离子电导率,是一种很有前途的固体电解质。为了通过掺杂等价物来提高其离子电导率,人们做出了许多努力。然而,别价取代会改变氯化锂的固有结构,影响其成本效益和电化学稳定性。在此,我们报告了嵌入无定形 AlOCl 化合物中的具有异质结构的纳米晶体氯化锂,以增强其离子导电性。纳米结晶扩大了氯化锂单胞,而非晶化则促进了界面离子传输。因此,非晶态 AlOCl 改性氯化锂纳米晶体(AlOCl-nanoLiCl)的离子电导率高达 1.02 mS cm-1,比氯化锂的离子电导率高出 5 个数量级。此外,它还具有高氧化稳定性、低成本(19.87 美元 kg-1)和低杨氏模量(2-3 GPa)。当 AlOCl 纳米氯化锂与富锂阴极(Li1.17Mn0.55Ni0.24Co0.05O2,4.8 V vs Li+/Li)结合使用时,全固态电池表现出显著的长期循环稳定性(1000 次循环)。这项研究提出了一种在不损害碱性氯化物固有优势的情况下增强其离子导电性的新策略。
Amorphous AlOCl Compounds Enabling Nanocrystalline LiCl with Abnormally High Ionic Conductivity
LiCl is a promising solid electrolyte, providing it possesses high ionic conductivity. Numerous efforts have been made to enhance its ionic conductivity through aliovalent doping. However, aliovalent substitution changes the intrinsic structure of LiCl, compromising its cost-effectiveness and electrochemical stability. Here, we report nanocrystalline LiCl embedded in amorphous AlOCl compounds with a heterogeneous structure to enhance its ionic conductivity. Nanocrystallization enlarges the LiCl unit cell, while amorphization facilitates interfacial ion transport. As a result, the amorphous AlOCl-modified LiCl nanocrystal (AlOCl-nanoLiCl) demonstrates a high ionic conductivity of 1.02 mS cm–1, which is 5 orders of magnitude higher than that of LiCl. Additionally, it exhibits high oxidative stability, low cost ($19.87 US kg–1), and low Young’s modulus (2–3 GPa). When AlOCl-nanoLiCl is coupled with Li-rich cathodes (Li1.17Mn0.55Ni0.24Co0.05O2, 4.8 V vs Li+/Li), all-solid-state batteries exhibit remarkable long-term cycling stability (>1000 cycles). This work presents a novel strategy to enhance the ionic conductivity of alkaline chlorides without compromising their intrinsic advantages.
期刊介绍:
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