A practical 4.8-V Li||LiCoO<sub>2</sub> battery.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40961194.
- Also identified by DOI 10.1126/sciadv.adx5020 and PMC identifier 12442873.
- Licence recorded as CC BY-NC.
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Abstract
Raising the charging voltage of a lithium||lithium cobalt oxide (Li||LiCoO<sub>2</sub>) battery is a shortcut to realize high energy density in portable electronics, while the fragile interface of highly delithiated LiCoO<sub>2</sub> (>4.55 volts) can trigger the lattice oxygen release, thus leading to severe interfacial degradation and structural collapse. Here, using lithium pentadecafluorooctanoate as a fluorine source to build robust lithium fluoride-rich electrode-electrolyte interfaces, stable Li||LiCoO<sub>2</sub> batteries at high voltage have been realized, capable of cycling 1500, 600, and 188 times at 4.6, 4.7, and 4.8 volts, respectively. Furthermore, the practicality of Li||LiCoO<sub>2</sub> batteries at an unprecedented cutoff voltage of 4.8 volts has been validated by a 2.7-ampere hour pouch cell, which shows a superior energy density of 544 watt-hours per kilogram and can operate more than 50 cycles. Our exploration of 4.8-volt LiCoO<sub>2</sub> may pave the way to ceaselessly approach its theoretical capacity.