Covalent and polyfluorinated lithium salt for stable LiCoO₂ batteries at high temperature and high voltage.

ABSTRACT: Elevating the charge cut-off voltage of the LiCoO₂ positive electrode beyond 4.5 V has already been the focus to unlock its energy for portable electronics, whereas the severe phase transitions during the delithiation of LiCoO₂ from 4.5 V to 4.7 V can ruin the electrode structure. Besides, the poor thermal and hydrolytic stabilities of traditional lithium salt (LiPF₆) prevent batteries from working at high temperatures and increase production costs and environmental pollution. Here, we show that using covalent lithium nonafluoro-n-butanesulfonate as a fluorine-rich lithium salt to create a robust LiF-rich cathode electrolyte interphase, which effectively impedes the surface destruction, we successfully realize a stable LiCoO₂ battery at a high vo

SUBMITTER: Xiong Q 

PROVIDER: S-EPMC12644891 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature