Abstract
AbstractRechargeable magnesium batteries are gaining attention as promising candidates for large‐scale energy storage applications because of their potentially high energy, safety and sustainability. However, the development of Mg batteries is impeded by the lack of efficient cathode materials and compatible electrode‐electrolyte combinations. Herein, we demonstrate a new poly(1,4‐anthraquinone)/Ketjenblack composite (14PAQ@KB) in combination with non‐corrosive magnesium tetrakis(hexafluoroisopropyloxy) borate Mg[B(hfip)4]2 (hfip=OC(H)(CF3)2) electrolyte towards high‐energy and long‐lifespan Mg batteries. This combination exhibits prominent electrochemical performance including a maximum discharge capacity of 242 mA h g−1 (approximately 93 % of the theoretical capacity), superior cycling stability (81 mA h g−1 after 1000 cycles), and excellent rate capability (120 mA h g−1 at 5 C).
Highlights
Rechargeable magnesium batteries have emerged as a promising candidate for the next-generation battery technologies owing to their potentials of offering efficient, safe and sustainable energy storage solutions.[1]
14PAQ was dissolved in chloroform (CHCl3), and Ketjenblack EC-600JD (KB) was added to the solution with a mass ratio of 1 : 1. The suspension was stirred and ultrasonicated to ensure a highly dispersion of the polymer on the surface of the carbon
The highresolution transition electron microscope (HRTEM) images reveal that the composite particles exhibit the graphitic walls of the hollow KB particles, while the amorphous area suggests the polymer film on the carbon surface (Figure 1g)
Summary
Rechargeable magnesium batteries have emerged as a promising candidate for the next-generation battery technologies owing to their potentials of offering efficient, safe and sustainable energy storage solutions.[1]. Quinone-based compounds based on thermodynamically favorable enolization reactions have attracted most of the attention so far.[5] Due to the high solubility of both small molecule quinone derivatives and their magnesiated products,[8] polymerization is usually applied as an improvement strategy to increase the reversible capacity and cycle life, and the ionic-liquid-based electrolytes provide promising alternatives.[9,10,11]. Taking into account the electrophilicity of the carbonyl groups, an non-nucleophilic electrolyte is a prerequisite for enabling reversible redox reactions of quinone-based polymers in Mg batteries.[12] the accessible capacity and capacity retention have been found to be strongly dependent on the electrolyte formulations. The current work provides general strategies to improve Mg-storage performance in polymer cathodes, aiming at high-capacity and long-lifespan Mg batteries
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