Operation Mechanism in Hybrid Mg–Li Batteries with TiNb<sub>2</sub>O<sub>7</sub> Allowing Stable High-Rate Cycling

نویسندگان

چکیده

We studied the structural evolution and cycling behavior of TiNb2O7 (TNO) as a cathode in nonaqueous hybrid dual-salt Mg–Li battery. A very high fraction pseudocapacitive contribution to overall specific capacity makes material suitable for ultrafast operation battery, composed Mg-metal anode, APC–LiCl electrolyte with Li Mg cations. Theoretical calculations show that intercalation is predominant over into TNO Mg2+ Li+, while experimentally up 20% cointercalation was observed after battery discharge. In batteries, shows capacities which are about 40 mA h g–1 lower than single-ion batteries at current densities 1.2 g–1. This likely due partial or/and location cations on alternative crystallographic sites structure comparison Li-intercalation process batteries. Generally, cells markedly superior applicability prolonged (above 1000 cycles) 100% Coulombic efficiency retention higher 95% conventional being cycled either under low (7.75 g–1) or (1.55 density. The better long-term especially pronounced 60 °C. reasons this an appropriate interface containing MgCl2 species performance anode electrolytes dendrite-free, fast deposition/stripping. stable stands contrast carbonate-containing electrolytes, prone dendrite formation, thus leading shortcut.

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ژورنال

عنوان ژورنال: ACS Applied Materials & Interfaces

سال: 2021

ISSN: ['1944-8244', '1944-8252']

DOI: https://doi.org/10.1021/acsami.0c20905