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Amorphous AlOCl Compounds Enabling Nanocrystalline LiCl with Abnormally High Ionic Conductivity

Hui DuanDepartment of Mechanical and Materials EngineeringChanghong WangEastern Institute for Advanced Study, Eastern Institute of TechnologyXusheng ZhangInstitute of Chemistry, Chinese Academy of Sciences (CAS)Jiamin FuDepartment of Mechanical and Materials EngineeringWeihan LiDepartment of Mechanical and Materials EngineeringJing WanInstitute of Chemistry, Chinese Academy of Sciences (CAS)Ruizhi YuDepartment of Mechanical and Materials EngineeringMin FanInstitute of Chemistry, Chinese Academy of Sciences (CAS)Fucheng RenEastern Institute for Advanced Study, Eastern Institute of TechnologyShuo WangNingbo Key Laboratory of All-Solid-State BatteryMatthew ZhengDepartment of Mechanical and Materials EngineeringXiaona LiNingbo Key Laboratory of All-Solid-State Battery, Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang 315200, P.R. ChinaJianwen LiangDepartment of Mechanical and Materials EngineeringRui WenCAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular SciencesSen XinInstitute of Chemistry, Chinese Academy of Sciences (CAS)Yu‐Guo GuoCAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular SciencesXueliang SunNingbo Key Laboratory of All-Solid-State Battery

2024en

ABI

Annotatsiya

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.

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Identifikatorlar

DOI: 10.1021/jacs.4c06498

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