Magnesium batteries have the potential to be a next generation battery with large capability and high safety, owing to the high abundance, great volumetric energy density, and reversible dendrite‐free capability of Mg anodes. However, the lack of a stable high‐voltage electrolyte, and the sluggish Mg‐ion diffusion in lattices and through interfaces limit the practical uses of Mg batteries. Herein, a spinel MgIn2S4 microflower‐like material assembled by 2D‐ultrathin (≈5.0 nm) nanosheets is reported and first used as a cathode material for high‐temperature Mg batteries with an ionic liquid electrolyte. The nonflammable ionic liquid electrolyte ensure the safety under high temperatures. As prepared MgIn2S4 exhibits wide‐temperature‐range adaptability (50–150 °C), ultrahigh capacity (≈500 mAh g−1 under 1.2 V vs Mg/Mg2+), fast Mg2+ diffusibility (≈2.0 × 10−8 cm2 s−1), and excellent cyclability (without capacity decay after 450 cycles). These excellent electrochemical properties are due to the fast kinetics of magnesium by the 2D nanosheets spinel structure and safe high‐temperature operation environment. From ex situ X‐ray diffraction and transmission electron microscopy measurements, a conversion reaction of the Mg2+ storage mechanism is found. The excellent performance and superior security make it promising in high‐temperature batteries for practical applications.
The current worldwide energy problems resulting from global environmental issues require highly efficient, environmentally benign energy storage technologies. Among various innovative battery types, rechargeable batteries based on magnesium (Mg) metal anodes represent an attractive option because of their large volumetric/gravimetric capacities and the cost-effectiveness of the base Mg metal. To realize practical Mg batteries, intense efforts have been focused on the development of cathode and electrolyte materials. Defect spinel oxides represent an emerging class of cathode active materials. The representative compound ZnMnO 3 has sufficient capacities for superlong cycles at elevated temperatures, owing to the suppression of the undesired spinel-rocksalt phase transition. To further enhance the electrochemical performance of ZnMnO 3 , hydrothermal treatment was applied to synthesize fine ZnMnO 3 nanoparticles. By controlling the pH of precursor solutions, treatment temperature, and reaction duration, fine ZnMnO 3 nanoparticles with a remarkably large surface area can be obtained. Our ZnMnO 3 , prepared using hydrothermal treatment, was able to deliver larger capacities compared with those obtained using the typical coprecipitation method. Furthermore, the hydrothermally treated ZnMnO 3 allowed stable battery cycling even at 30 °C; this was achieved by combining the highly efficient, electrochemically stable electrolyte and the ZnMnO 3 nanoparticles with the shortened diffusion path.
Mg batteries have the potential to be the next generation battery with large capability and high safety, owing to the high abundance, great volumetric energy density and reversible dendrite free of Mg anodes. In article number 1902236, Kiyoshi Kanamura and co‐workers use spinel MgIn2S4 microflower‐like material assembled by 2D‐ultrathin nanosheets as cathode material for high‐temperature Mg batteries with an ionic liquid electrolyte. As prepared MgIn2S4 exhibits wide‐temperature‐range adaptability, ultrahigh capacity, fast Mg2+ diffusibility and excellent cyclability. The excellent performance and superior security make it promising as high‐temperature batteries for practical applications.
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