New solid state battery material for next generation batteries
01 Sep 2021
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Scientists analyse candidate materials to create next generation of solid state batteries.

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​​Crystal structure of Li1.5La1.5MO6 double perovskites

 

​n a solid-state battery, a solid electrolyte component replaces the liquid electrolyte, improving the safety and the amount of energy that the battery can store. However, using a solid-state electrolyte brings other challenges, such as resistance and chemical incompatibility with the electrodes. 

This study, published in Nature Communications, reports the development of a new family of materials that contains suitable candidates for both the electrode and the electrolyte. This leads to more compatible and stable interfaces between the two. The research group used computational modelling to design the materials by tweaking the chemical composition. They then brought the materials to ISIS to confirm their predictions using neutron diffraction and muon spectroscopy. 

Their new materials take the perovskite structure, with one containing tungsten and the other tellurium, leading to excellent compatibility. Both contain a high concentration of lithium ions in their crystal structure, which provides fast lithium-ion diffusion. They found that, while tungsten can readily change oxidation state – ideal for an electrode – tellurium is resistant to redox cycling suitable for the electrolyte. As well as testing the materials separately, the group also combined them in a single hybrid solid-state cell, and found that the electrode functionality was maintained.


Related publication: “Li1.5La1.5MO6 (M = W6+, Te6+) as a new series of lithium-rich double perovskites for all-solid-state lithium-ion batteries.” Nature Communications, 11, 6392 (2020) 

DOI: 10.1038/s41467-020-19815-5

Contact: Jones, Evan (STFC,RAL,ISIS)