Fangyan Cui, Jingzhen Li, Chen Lai, Changzhan Li, Chunhao Sun, Kai Du, Jinshu Wang, Hongyi Li, Aoming Huang, Shengjie Peng, Yuxiang Hu
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引用次数: 0
摘要
传统上,摇椅电池的容量主要取决于阳离子的穿梭。然而,Al3+ 等固有的高电荷密度金属离子不可避免地会引起强烈的库仑离子-晶格相互作用,从而导致实际能量密度低和可充电铝电池(RAB)的长期稳定性差。在此,我们引入了可调量子约束效应,并定制了一系列阴离子/阳离子共(脱)插超晶格阴极,从而在 RAB 中实现了具有额外容量的高电压阴离子电荷补偿。优化的超晶格阴极具有可调节的范德华,不仅能方便地实现传统的阳离子(去)插层,还能通过额外的阴离子反应激活 O2- 补偿。此外,所构建的阴极还具有高能量密度(466 Wh kg-1 ,107 W kg-1)和最佳循环稳定性(225 mAh g-1 ,3000 个循环,2.0 A g-1)。总之,阴离子参与氧化还原机制克服了传统电极的瓶颈,从而预示着储能系统有望取得进展。
Superlattice cathodes endow cation and anion co-intercalation for high-energy-density aluminium batteries
Conventionally, rocking-chair batteries capacity primarily depends on cation shuttling. However, intrinsically high-charge-density metal-ions, such as Al3+, inevitably cause strong Coulombic ion-lattice interactions, resulting in low practical energy density and inferior long-term stability towards rechargeable aluminium batteries (RABs). Herein, we introduce tunable quantum confinement effects and tailor a family of anion/cation co-(de)intercalation superlattice cathodes, achieving high-voltage anion charge compensation, with extra-capacity, in RABs. The optimized superlattice cathode with adjustable van der Waals not only enables facile traditional cation (de)intercalation, but also activates O2– compensation with an extra anion reaction. Furthermore, the constructed cathode delivers high energy-density (466 Wh kg–1 at 107 W kg−1) and one of the best cycle stability (225 mAh g–1 over 3000 cycles at 2.0 A g–1) in RABs. Overall, the anion-involving redox mechanism overcomes the bottlenecks of conventional electrodes, thereby heralding a promising advance in energy-storage-systems.
期刊介绍:
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.