Abstract
Most metal fluorides-based Li ion battery cathodes suffer from large voltage polarization, volume change, slow rate, and capacity loss in battery cycling due to Li conversion reactions. Here we report a new type of intercalation Li metal fluorides obtained from Li/Na ion exchange of Na-intercalation compounds. The strategy enables a broad chemical design space of new intercalation compounds through the coupling of chemical and electrochemical synthesis pathways at drastically different temperatures. Both voltage plateau and cyclability can be tuned by composition control from chemical synthesis. Our Na/Li ion-exchange strategy thus opens the door to a family of intercalation Li metal fluorides that were not accessible previously due to conversion reactions of such compounds from direct chemical synthesis.
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