TY - JOUR
T1 - Toward "rocking-chair type" Mg-Li dual-salt batteries
AU - Ichitsubo, Tetsu
AU - Okamoto, Shinya
AU - Kawaguchi, Tomoya
AU - Kumagai, Yu
AU - Oba, Fumiyasu
AU - Yagi, Shunsuke
AU - Goto, Natsumi
AU - Doi, Takayuki
AU - Matsubara, Eiichiro
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2015.
PY - 2015/5/21
Y1 - 2015/5/21
N2 - High energy-density rechargeable batteries are strongly demanded from the viewpoint of energy and environmental concern. This work is devoted to fundamental electrochemistry on a novel concept of rechargeable batteries, "rocking-chair type" Mg-Li dual-salt batteries (DSBs), where both Mg and Li cations are carrier ions. In this system, dangerous dendritic growth is drastically suppressed by co-electrodeposition of Mg and Li, and Mg-Li alloys can be used as anode materials with high electrical capacities. As a DSB cathode material that can accommodate both Mg and Li cations, we use a spinel oxide MgCo2O4, in which an eccentric insertion mechanism, the "intercalation & push-out" process, occurs. Mg insertion occurs at 2.9 V vs. Mg2+/Mg and Li insertion occurs at 3.1 V vs. Li+/Li, being consistent with ab initio calculations, and its capacity approximately amounts to 150-200 mA h g-1. In the combination of MgCo2O4 and Mg50Li50 alloys, the cell voltage during discharge is as high as about 2-3 V. The concept of rocking-chair type DSB systems provides a new strategy for future safe rechargeable batteries combining high energy/power densities.
AB - High energy-density rechargeable batteries are strongly demanded from the viewpoint of energy and environmental concern. This work is devoted to fundamental electrochemistry on a novel concept of rechargeable batteries, "rocking-chair type" Mg-Li dual-salt batteries (DSBs), where both Mg and Li cations are carrier ions. In this system, dangerous dendritic growth is drastically suppressed by co-electrodeposition of Mg and Li, and Mg-Li alloys can be used as anode materials with high electrical capacities. As a DSB cathode material that can accommodate both Mg and Li cations, we use a spinel oxide MgCo2O4, in which an eccentric insertion mechanism, the "intercalation & push-out" process, occurs. Mg insertion occurs at 2.9 V vs. Mg2+/Mg and Li insertion occurs at 3.1 V vs. Li+/Li, being consistent with ab initio calculations, and its capacity approximately amounts to 150-200 mA h g-1. In the combination of MgCo2O4 and Mg50Li50 alloys, the cell voltage during discharge is as high as about 2-3 V. The concept of rocking-chair type DSB systems provides a new strategy for future safe rechargeable batteries combining high energy/power densities.
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U2 - 10.1039/c5ta01365h
DO - 10.1039/c5ta01365h
M3 - Article
AN - SCOPUS:84928978963
VL - 3
SP - 10188
EP - 10194
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 19
ER -