Abstract
A poly(ionic liquid)s binder can provide stable performance of high-voltage composite cathodes based on lithium nickel cobalt aluminium oxide (LiNi0.8Co0.15Al0.05O2 or NCA), up to 4.5 V (vs. Li+/Li0) at 50 °C for an electrode with high areal capacity up to 1.6 mAh cm−2. A reversible capacity of more than 150 mAh g−1 in an all-solid-state device using a highly concentrated poly(ionic liquid)s-based composite polymer electrolyte is achieved with high-capacity retention on cycling. Characterization of the composite electrode and polymer electrolyte post-cycling using scanning electron microscopy confirms stable behaviour with only small volume changes evident. This report thus demonstrates these solid polymer electrolytes as promising for high energy density high-voltage all-solid-state lithium (Li) batteries.
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Acknowledgements
Prof Maria Forsyth thanks the Australian Research Council for Australian Laureate Fellowship program. The authors also thank the Battery Technology Research and Innovation Hub (BatTRI-Hub) at Deakin University for their battery prototyping facilities.
Funding
The authors received financial support from the Australia-India Strategic Research Fund (AISRF, grant agreement no. 48515).
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Highlights
1. Poly(ionic liquid)s binder is used in high-voltage NCA-based electrodes.
2. All-solid-state Li metal batteries with high loading active material (~ 8.0 mg cm−2) are demonstrated.
3. Stable cycling enabled by poly(ionic liquid)s-based electrolytes with ultra-high lithium salt content.
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Girard, G.M.A., Wang, X., Yunis, R. et al. Stable performance of an all-solid-state Li metal cell coupled with a high-voltage NCA cathode and ultra-high lithium content poly(ionic liquid)s-based polymer electrolyte. J Solid State Electrochem 24, 2479–2485 (2020). https://doi.org/10.1007/s10008-020-04775-z
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DOI: https://doi.org/10.1007/s10008-020-04775-z