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Functional modules for enhanced amorphous composite halide solid electrolytes for low-temperature all-solid-state lithium batteries
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DOI：10.1038/s41467-026-71876-0.png)
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Abstract
En 中文
Solid-state electrolytes (SSEs) are the essential component of all-solid-state batteries (ASSBs). Designing better SSEs holds the key to the success of the ASSBs. Here, this study effectively realises the design of SSEs through functional modules. Various functional designs have been achieved by incorporating different functional models. Here, we initially introduce LaCl3, which possesses a UCl3 structure, as a functional module to demonstrate the feasibility of our approach. The Li2O-1.8TaCl5-0.2LaCl3 (LTLOC) SSE enable the ASSB with LiNi0.88Co0.09Mn0.03O2 (NCM88) to exhibit stable cycling and stable operation at low temperature (−30 °C). Additionally, various types of functional modules, including chloride, oxide, and fluoride, have been successfully introduced, further supporting the universality of amorphous functional module design. Furthermore, the incorporation of low-cost and low-density AlF3 highlights the benefits of this design approach, as it allows for a high proportion of fluoride to be introduced without compromising ionic conductivity. Li2O-1.8TaCl5-5AlF3 (LTOC-5AlF3) exhibits stability in humid conditions, resistance to high voltage, and compatibility with lithium metal simultaneously. The key strength of this design approach is its ability to maintain advantages and make up for the shortcomings. Designing improved halide solid electrolytes holds the key to the success of all-solid-state batteries. Here, authors present the design of SSEs through functional modules, introducing LaCl3, which possesses a UCl3 structure, as well as low-cost and low-density AlF3, to enable low-temperature application and improve moisture and high-voltage stability in halide-based solid-state battery systems.
Keywords:
amorphous composite
halide solid electrolytes
functional modules
low-temperature operation
all-solid-state lithium batteries
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