Conductive binary Li borate glass coating for improved Ni-rich positive electrode in sulfide-based all-solid-state Li batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41145437.
- Also identified by DOI 10.1038/s41467-025-64532-6 and PMC identifier 12559224.
- Licence recorded as CC BY-NC-ND.
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Abstract
Coating Ni-rich layered oxide positive electrodes is essential to improve their electrochemical performance in sulfide-based all-solid-state Li batteries, but achieving cost-effective, high-performance positive electrodes remains challenging. In this work, we apply a thin (~3 nm) conductive binary Li borate glass coating (0.5Li<sub>2</sub>O·0.5B<sub>2</sub>O<sub>3</sub>) onto single-crystal LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> using a simple dry process and heating. This coated positive electrode delivers 209 mAh g<sup>-1</sup> specific capacity at a specific current of 20 mA g<sup>-1</sup> with 79.7% initial Coulombic efficiency, retains 87.8% capacity after 1000 cycles at a specific current of 200 mA g<sup>-1</sup>, and achieves 14.6 mAh cm<sup>-2</sup> areal capacity. Pouch cells with this positive electrode reach 383 Wh kg<sup>-1</sup> specific energy, and sustain 300 cycles at a specific current of 66.67 mA g<sup>-1</sup>. Various characterizations reveal that this coating can enhance Li-ion transport, stabilize the positive electrode lattice, and strengthen the interface between positive electrode and sulfide electrolyte. Here we show that conductive glass coatings enable high-voltage positive electrodes with high stability and specific energy in all-solid-state batteries.