High-Sulfur Loading and Single Ion-Selective Membranes for High-Energy and Durable Decoupled Aqueous Batteries
ADVANCED MATERIALS(2024)
摘要
The decoupled battery design is promising for breaking the energy density limit of traditional aqueous batteries. However, the complex battery configuration and low-selective separator membranes restrict their energy output and service time. Herein, a zinc-sulfur decoupled aqueous battery is achieved by designing a high-mass loading sulfur electrode and single ion-selective membrane (ISM). A vertically assembled nanosheet network constructed with the assistance of a magnetic field enables facile electron and ion conduction in thick sulfur electrodes, which is conducive to boosting the cell-level energy output. For the tailored ISM, the Na ions anchored on its skeleton effectively prevent the crossover of OH- or Cu2+, facilitating the transport of Na+ and ensuring structural and mechanical stability. Consequently, the Zn-S aqueous battery achieves a reversible energy density of 3988 Wh kgs-1 (by sulfur mass), stable operation over 300 cycles, and an energy density of 53.2 mWh cm-2. The sulfur-based decoupled system may be of immediate benefit toward safe, reliable, and affordable static energy storage. A single-membrane decoupled aqueous Zn-S battery is achieved by decoupling the S/Cu2S cathode and Zn/Zn(OH)42- anode, which presents an energy density of 3988 Wh kgs-1 (based on sulfur mass). The high areal energy density and long operational life originate from the high-sulfur loading cathode and newly designed single ion-selective membrane.image
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关键词
decoupled batteries,high sulfur loading,ion channels,ion-selective membranes,Zn-S aqueous batteries
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