title: Controlling the intercalation chemistry to design high-performance dual-salt hybrid rechargeable batteries.
abstract: We have conducted extensive theoretical and experimental investigations to unravel the origin of the electrochemical properties of hybrid Mg(2+)/Li(+) rechargeable batteries at the atomistic and macroscopic levels. By revealing the thermodynamics of Mg(2+) and Li(+) co-insertion into the Mo6S8 cathode host using density functional theory calculations, we show that there is a threshold Li(+) activity for the pristine Mo6S8 cathode to prefer lithiation instead of magnesiation. By precisely controlling the insertion chemistry using a dual-salt electrolyte, we have enabled ultrafast discharge of our battery by achieving 93.6% capacity retention at 20 C and 87.5% at 30 C, respectively, at room temperature.
authors.affiliation: Center for Energy Convergence Research, Korea Institute of Science and Technology , Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Jae-Hyun
authors.initials: JH
authors.lastname: Cho
authors.forename: Muratahan
authors.initials: M
authors.lastname: Aykol
authors.forename: Soo
authors.initials: S
authors.lastname: Kim
authors.forename: Jung-Hoon
authors.initials: JH
authors.lastname: Ha
authors.forename: C
authors.initials: C
authors.lastname: Wolverton
authors.forename: Kyung Yoon
authors.initials: KY
authors.lastname: Chung
authors.forename: Kwang-Bum
authors.initials: KB
authors.lastname: Kim
authors.forename: Byung-Won
authors.initials: BW
authors.lastname: Cho