pp 1–10 | Cite as

A LiA1Cl4·3SO2-NaAlCl4·2SO2 binary inorganic electrolyte with improved electrochemical performance for Li-metal batteries

  • Ruopeng Li
  • Bo WangEmail author
  • Tiantian Gao
  • Changyuan Bao
  • Rensheng Song
  • Dianlong WangEmail author
Original Paper


A LiAlCl4·3SO2-NaAlCl4·2SO2 binary inorganic electrolyte was prepared by using NaAlCl4·2SO2 as the functional additive and mixing with LiAlCl4·3SO2. The obtained LiAlCl4·3SO2-NaAlCl4·2SO2 not only has good non-flammability but also exhibits improved electrochemical performance for Li-metal batteries. With the addition of NaAlCl4·2SO2, the fabricated Li/Cu cells using mixed inorganic electrolyte display higher average coulombic efficiency and more excellent cycling stability. Through scanning electron microscopy (SEM) characterization, it is demonstrated that the surficial morphology of Li-deposited layer is smoother in LiAlCl4·3SO2-NaAlCl4·2SO2 binary electrolyte system than pure LiAlCl4·3SO2. Furthermore, the fabricated Li/graphite cells using LiAlCl4·3SO2-NaAlCl4·2SO2 binary electrolyte also show higher specific capacity and better cycling stability than using pure LiAlCl4·3SO2 electrolyte as well as the conventional organic electrolyte (1 M LiPF6 in ethylene carbonate/dimethyl carbonate mixed solvent with 1:1 in volume). Consequently, LiAlCl4·3SO2-NaAlCl4·2SO2 is proposed to have great potential for the safe and high-performance Li-metal batteries.

Graphic abstract

A LiAlCl4·3SO2-NaAlCl4·2SO2 binary inorganic electrolyte is prepared by using NaAlCl4·2SO2 as the functional additive and mixing with LiAlCl4·3SO2, which exhibits improved electrochemical performance for Li-metal batteries


LiAlCl4·3SO2 NaAlCl4·2SO2 Non-flammable Dendrite inhibition Stable SEI film 



National Natural Science Foundation of China (Nos. 51874110 and 51604089), the China Postdoctoral Science Foundation (Grant Nos. 2016M601431 and 2018T110308), and the Heilongjiang Province Postdoctoral Science Foundation (Grant Nos. LBH-Z16056 and LBH-TZ1707) are acknowledged.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinChina

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