Chain-Transported Hypercoordinated Chloroaluminate Electrolyte for Solid-State Aluminum-Ion Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 40907018.
- Also identified by DOI 10.1021/acsnano.5c09979.
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Abstract
Aluminum-ion batteries (AIBs) have garnered significant attention due to their high safety and environmental compatibility. However, their practical development has been hindered by conventional liquid electrolytes, which suffer from a narrow electrochemical stability window and interfacial instability. Here, we develop a hypercoordinated chloroaluminate electrolyte (HCCAE) for low-cost and long-life solid-state AIBs, featuring a chain-assisted ion transport mechanism. Different from traditional ionic liquid electrolytes (ILs) that rely on AlCl<sub>4</sub><sup>-</sup> and Al<sub>2</sub>Cl<sub>7</sub><sup>-</sup> for ion conduction, the HCCAE forms a network where chloride ions from minimal 1-ethyl-3-methylimidazolium chloride (EMIC) migrate through a hypercoordinated AlCl<sub>3</sub>-rich framework, enabling a continuous, fast and stable solid-state conduction pathway [AlCl<sub>3</sub>-(AlCl<sub>3</sub>)<sub><i>n</i></sub>-AlCl<sub>3</sub>-AlCl<sub>4</sub><sup>-</sup>]. The electrolyte exhibits ionic conductivity of 0.89 mS cm<sup>-1</sup>, an electrochemical window of >2.6 V, and electrolyte-electrode stability with Al plating/stripping over 900 h. The full battery demonstrates excellent cycling performance over 2000 cycles with high Coulombic efficiency. This work provides insights into ion transport mechanisms in aluminum-based solid electrolytes, which helps to achieve low-cost, high-safety, and long-life AIBs.